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6.10 Guidance for Surveyors and Installers for the Provision of Trickle Ventilation and Other Forms of Ventilation for Replacement Windows within England and Wales

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Section 6 – Windows and Doors: Guidance for Surveyors and Installers for the Provision of Trickle Ventilation and Other Forms of Ventilation for Replacement Windows within England and Wales

A Guide to Trickle Ventilators Ref (30.7)

This A5 single folded leaflet is a useful guide for homeowners and window installation companies. The leaflet covers the types of frame and window locations where trickle ventilators can be used. In addition it also addresses the requirement for Building Regulations in England and Wales that there shall be adequate means for ventilation provided for people in the building. In addition, this GGF publication explains why homes need ventilation and outlines the three different types of ventiliation. Also included in this leaflet is the issue of security and ventiliation and how trickle ventilators are required for new and existing buidlings. Installation companies will find it very useful when explaining trickle ventilators to their customers.

A_Guide_To_Trickle_Ventilators

Trickle Ventilators

A Guide to Trickle Ventilators is a useful introduction to trickle ventilation for both homeowners and window installation companies.

Trickle ventilators are installed as part of the window unit, and can provide constant, unobtrusive and secure background ventilation for a home.

This GGF guide covers the types of frame and window locations where trickle ventilators can be used. It also explains why homes need ventilation.

Ventilation is necessary to provide a healthy and comfortable internal environment for the building occupants.

The guide explains why homes need ventilation and outlines the three different types of ventiliation available.

It makes special mention of the requirement of Building Regulations in England and Wales ‘that there shall be adequate means for ventilation provided for people in the building’, and how this requirement may be met.

Also included in the guide is the issue of security and ventiliation, and how trickle ventilators are required for new and existing buidlings.

As well as being an informative resource for homeowners, window installation companies will find this guide very useful when explaining trickle ventilators to their customers.

GGF Publications “Quick Link Index”

Please find listed below the complete list of available GGF technical and membership publications with quick direct links to each publication.

Some of the datasheets marked “in progress” means they are under review by the GGF Technical team, however where there is a link the current versions are still available until any changes are made.

The GGF Health and Safety publications can be found in a separate section. Please go here if you are looking for Health and Safety publications. https://www.ggf.org.uk/publications/health-and-safety-publications/

New or amended publications in the last 6-12 months are marked up NEW in blue text.

1.2 Datasheet – Plastic Glazing Sheet Materials Basic Products – Feb 2000
Section 1: Glass Types, Plastics and Glazing Materials

2.1 Datasheet Building Regulations – Glazing – In Progress – no existing datasheet

2.2 Datasheet Window and Door System U-Values: Certified Data – June 2020 NEW
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-2-physical-environment/2-2/

2.3 Datasheet GGF guide to WER and DSER – June 2020 NEW
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-2-physical-environment/2-3/

2.9 Industry Guidance A Guide to the Design of Fire-Resistant Glazed Screens and Partitions to comply with the requirements for Impact and Crowd loadings – Jan 2001 https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-2-physical-environment/2-9/

4.1 Datasheet Basic Putty Fronting Glazing Techniques for Single Glazing – Current – Review in progress
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/4-1/

4.2 Datasheet System Design & Glazing for Insulating Glass Units – Current – Review in progress https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/4-2/

4.2.2 Industry Guidance Triple Glazing Guidance. Guidance for IGU Manufacturers, Frame Fabricators and Installers – 2016
https://www.ggf.org.uk/publications/window-installation/triple-glazing-guidance/

4.2.4 Datasheet Quality of Georgian Bars and Leaded lights within Insulating Glass Units – In Progress – no current datasheet

4.4 Datasheet Quality of thermally toughened soda lime silicate safety glass for building – 2017
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/4-4/

4.4.1 Datasheet Thermally treated soda lime silicate glass products – General – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-4-1/

4.4.2 Datasheet Thermally treated soda lime silicate glass products – Spontaneous breakage – 2018
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-4-2

4.4.3 Datasheet Thermally treated glass – Appearance – Interference Phenomenon – 2018
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-4-3/

4.4.4 Datasheet Initial Type Testing – In Progress – no existing datasheet

4.4.5 Datasheet 1279 Update – In Progress – no existing datasheet

4.5 Datasheet Glazing with plastics – 2003
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-5/

4.6.1 Datasheet Channel shaped glass: Generalities, definitions, terminology and properties – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.6.1-Final.pdf

4.6.2 Datasheet Channel shaped glass: Annealed – Wired & Unwired – June 2020 NEW https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.6.2-2-Final-3-1.pdf

4.6.3 Datasheet Channel shaped glass: Thermally toughened soda lime silicate channel shaped safety glass June 2020 NEW https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.6.3-Final-2.pdf

4.6.4 Datasheet Channel shaped glass: Coated channel shaped glass – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.6.4-Final.pdf

4.6.5 Datasheet Channel shaped glass: Glazing and performance of channel shaped glass – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.6.5-Final.pdf

4.8 Datasheet Recommendations for Fixing Mirrors – Current – Review in progress

4.8.1 Datasheet Visual Quality of Installed Mirrors – Current – Review in progress
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-4.8.1-Final-2-1.pdf

4.9 Datasheet Compatibility of Glazing Sealants and Compounds with Insulating Glass Units – Current – Review in progress
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-9/

4.10 Datasheet Visual Quality Standard for installed Insulating Glass units Constructed from Flat Transparent Glass – Current – Review in progress
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/4.10-Datasheet.pdf

4.11 Datasheet Laminated glass and laminated safety glass – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-11/

4.12.1 Datasheet Curved glass Part 1: Generalities – Terminology, Properties and basis of measurement and test – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-12-1/

4.12.2 Datasheet Curved Glass Part 2: Curved annealed glass – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-12-2/

4.12.3 Datasheet Curved Glass Part 3: Curved thermally treated glasses – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-12-3/

4.12.4 Datasheet Curved Glass Part 4: Curved laminated glasses – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-12-4/

4.12.5 Datasheet Curved Glass Part 5: Curved Insulating Glass Units – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-4-products-glazing-techniques-maintenance/section-4-4-12-5/

5.1.1 Datasheet GGF Emergency Glazing Group – Making safe procedures – 2012
https://www.ggf.org.uk/wp-content/uploads/_pda/securepdfs/2018/02/GGF_DATASHEET_5_1_1-_update-2.pdf

5.15.1 Datasheet Glass repair – Removal of surface damage from glass – 2015
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-5-special-applications/section-5-5-15-1/

5.16: GGF Datasheet: A Guide to achieving Mandatory Compliance for the manufacture of Fire-Resistant Insulating Glass Units
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.16.pdf

5.16.1 Datasheet Appearance and visual quality specification for fire resistant glass and insulating glass units incorporating fire resistant glass – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-5-special-applications/section-5-5-16-1/

5.18 Datasheet Window Film: Recommendations for Adhesive Backed Polymeric Film Applied to Glass – June 2020 NEW

5.18.1 Datasheet Window Film: Visual Quality for Adhesive Backed Polymeric Filmed Glass – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.1.pdf

5.18.2A Datasheet Installation Quality Standard for Applying Adhesive Backed Polymeric Film to Glass – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.2A.pdf

5.18.2B Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: Installation Standard – June 2020 NEW https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.2B-1.pdf

5.18.3 Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: Visual Quality – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.3.pdf

5.18.4 Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: Blast Mitigation – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.4.pdf

5.18.5 Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: Containment of glass in the overhead position in the event of failure: Types of Systems and Precautions in use – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.5.pdf

5.18.6 Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: Containment of glass in the overhead position in the event of failure: Test Method – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.6.pdf

5.18.7 Datasheet Recommendations for Adhesive Backed Polymeric Film Applied to Glass: On-site Peel Adhesion Testing – Aged adhesive backed polymeric film applied to vertical glass – June 2020 NEW
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-5.18.7.pdf

5.18.8 Datasheet Adhesive backed polymeric film guidelines for installation onto existing glazing – June 2020 NEW
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-5-special-applications/section-5-5-18-8/

6.1 Datasheet Windows & Doors: Safety
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-6.1-V6.pdf

6.2 Datasheet Windows & Doors: Security
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-6.2-V4.pdf

6.3 Datasheet Windows & Doors: Ventilation
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-6.3-V4.pdf

6.4 Datasheet Windows and Doors: Weather Resistance
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-6.4-V5.pdf

6.5 Datasheet Windows and Doors: Sound Attenuation
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-6.5-V4.pdf

6.6 Datasheet Windows and Doors: Light Transmittance – In Progress – no current datasheet

6.7 Datasheet Guidelines for the Selection, Installation and Maintenance of Hardware for the Window and Door Industry – In Progress – no current datasheet
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-6-windows-doors/section-6-6-7/

6.8 Datasheet Guidelines for the Selection, Installation and Maintenance of Screws and Fasteners for the Window and Door Industry – In Progress – no current datasheet
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-6-windows-doors/section-6-6-8/

6.9 Datasheet Specification for the Performance of Door Assemblies – In Progress – no current datasheet
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-6-windows-doors/section-6-6-9/

6.10 Datasheet Guidance for Surveyors and Installers for the Provision of Trickle Ventilation and other forms of Ventilation for replacement Windows within England and Wales – Current – Awaiting AD F update
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-6-windows-doors/section-6-6-10/

6.11 Datasheet Guidelines for the selection, installation and maintenance of screws and fasteners for the Window and Door industries – In Progress – no current datasheet

6.16 Trade Guidance Product Substitution
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/GGF-Product-Substitution-booklet-A5-4pp-FOR-WEBSITE.pdf

7.1 Datasheet Non-Vertical Overhead Glazing. Guide to the Selection of Glass from the Point of View of Safety – Current – Awaiting BS5516 & 6262 Update
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-7-architectural-glazing-systems/section-7-7-1/

7.2 Datasheet Guidelines for the Use of Glass in Protective Barriers
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Data_Sheet_7.2_Nov_2014-1.pdf

8.1.1 Datasheet Security glazing Part 1: Definitions and description – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-8-security/section-8-8-1-1/

8.1.2 Datasheet Security glazing Part 2: Manual attack-resistant glazing – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-8-security/section-8-8-1-2/

8.1.3 Datasheet Security glazing Part 3: Bullet resistant glazing – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-8-security/section-8-8-1-3/

8.1.4 Datasheet Security glazing Part 4: Explosion Resistant Glazing – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-8-security/section-8-8-1-4/

8.1.5 Datasheet Security glazing Part 5: Framing and installation – 2016
https://www.ggf.org.uk/publications/glazing-manual/glazing-manual-section-8-security/section-8-8-1-5/

9.1 Datasheet Building Regulations – Windows & Doors – In Progress – no current datasheet

9.1A Datasheet – Guide to Building Regulations for Dwellings – England & Wales
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-9.1a-V2-1.pdf

9.1B Datasheet – Guide to Building Regulations for Dwellings – Scotland
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-9.1b-V2.pdf

9.1C – Guide to Building Regulations for Dwellings – NI
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/Datasheet-9.1c-V2.pdf

9.1D – Guide to Building Regulations for New and Existing Dwellings – Republic of Ireland
https://www.ggf.org.uk/wp-content/uploads/_pda/2018/01/datasheet-9.1d-V2.pdf

9.2 Datasheet Construction Products Regulation – In Progress – no current datasheet

10.1 Datasheet Glass in the Home – General – In Progress – no current datasheet

10.2 Datasheet Glass in the Home – Furniture – In Progress – no current datasheet

10.3 Datasheet Glass in the Home – Showers and Baths- In Progress – no current datasheet

10.4 Datasheet Glass in the Home – Kitchen Worktops and Splashbacks – In Progress – no current datasheet

10.5 Datasheet Glass in the Home – White/Brown Goods – In Progress – no current datasheet

10.6 Datasheet Guidelines for the Use of Glass in Floors – In Progress – no current datasheet

20.1 Industry Guidance A guide to Best Practice in the specification and use of fire-resistant glazed systems – 2018
https://www.ggf.org.uk/publications/fire-resistant-glazing-publications/guide-best-practice-specification-use-fire-resistant-glazed-systems/

20.2 Industry Guidance A guide to good practice. Specification and installation of conservatories within the UK
https://www.ggf.org.uk/publications/trade-training-guides/guide-good-practice-specification-installation-conservatories-within-united-kingdom/

20.3 Industry Guidance A guide to good practice in the specification, installation and use of replacement windows and doors within England and Wales. – 2016
https://www.ggf.org.uk/publications/trade-training-guides/guide-good-practice-installation-replacement-windows-doors/

20.5 Industry Guidance Safety and security glazing good practice guide – 2017
https://www.ggf.org.uk/publications/safety-and-security/safety-security-glazing-good-practice-guide/

21.1 GGF Standard Glass and Glazing Federation Standard for the Specification, Supply and Installation of Fire-Resistant Barriers containing Glass for Resistance against the passage of Fire and Products of Combustion
https://www.ggf.org.uk/publications/fire-resistant-glazing-publications/standard-specification-supply-installation-fire-resistant-barriers-containing-glass/

30.1 Consumer Guidance Low Emissivity Glass: The visual quality of Low Emissivity Glass – Current – Review in progress
http://shop.ggfmembers.com/low-emissivity-glass-and-its-visual-quality-ref-30-1/

30.4 Consumer Guidance Quality of Vision, Double Glazing: Gives details of the visual quality to expect from your double glazed units – Current – Review in progress
http://shop.ggfmembers.com/quality-of-vision-insulating-glass-units-ref-30-4/

30,5 Consumer Guidance Glass repair – Professional advice on repairing damage on glass surfaces – 2012
https://www.ggf.org.uk/publications/consumer-leaflets/glass-repair/

30.6 Consumer Guidance Advice to consumers regarding ventilation when replacing windows in dwellings – Awaiting AD F update
https://www.ggf.org.uk/publications/consumer-leaflets/ventilation-replacing-windows-dwellings/

30.7 Consumer Guidance A Guide to Trickle Ventilators – Current – Awaiting AD F update
https://www.ggf.org.uk/publications/consumer-leaflets/guide-trickle-ventilators/

30.11 Industry Guidance Consumer acoustics guide
http://shop.ggfmembers.com/acoustics-how-glazing-can-help-reduce-noise-entering-the-home-ref-30-11/

35.1 Consumer Guidance Conservatories Making the right Choice Offers advice and information on materials, designs and building purchase of a conservatory. – 2020 NEW
https://www.ggf.org.uk/publications/consumer-leaflets/consumer-guide-conservatories/

40.1 Consumer Guidance Laminated Glass. Safety and Security. Can you afford not to use it? – 2016
https://www.ggf.org.uk/publications/safety-and-security/laminated-glass-safety-security/

40.2 Industry Guidance Window Film; A guide to the Selection of Applied Film for Glass.- 2012
http://shop.ggfmembers.com/window-film-applications-and-solutions-ref-40-2/

40.3 Consumer Guidance The Right Glazing in the Right Place Covers the different areas of buildings and the correct glazing to use.
http://shop.ggfmembers.com/the-right-glazing-in-the-right-place-ref-40-3/

40.4 Consumer Guidance Toughened Glass. Safety and Strength. Can you afford not to use it? – 2016
https://www.ggf.org.uk/publications/safety-and-security/toughened-glass-safety-strength/

50.1 Consumer Guidance Condensation – Some Causes, Some Advice Explains how condensation occurs and offers some ways of reducing it – 2013
https://www.ggf.org.uk/publications/consumer-leaflets/condensation/

Why You Should Join the GGF
https://www.ggf.org.uk/wp-content/uploads/2019/07/Why-You-Should-Join-the-GGF.pdf

50.4 Model Terms and Conditions of Contract for non-GGF Members
http://shop.ggfmembers.com/model-terms-and-conditions-of-contract-for-non-ggf-members-ref-50-4/

50.4a GGF Guidance on the Implementation of the EU Consumer Rights Directive on 13th June 2014
http://shop.ggfmembers.com/ggf-guidance-on-the-implementation-of-the-eu-consumer-rights-directive-on-13th-june-2014-ref-50-4a/

50.5 Industry Guidance Narrow cavity Insulating glass Units – Sept 2014
http://shop.ggfmembers.com/narrow-cavity-insulating-glass-units-igus-with-reduced-spacer-bar-sightlines-ref-50-5/

100.1 GGF Standard TS007 security standard for replacement lock cylinders and protective door furniture – a guide for security and building professionals, installers and locksmith

Members meet on Future Homes Consultation

On 7^th January, over 35 GGF Member companies met with the GGF Technical team to discuss the impact of the Government Future Homes Consultation proposals and to finalise the GGF’s response to the Consultation.

The meeting was chaired by David Borland, Technical Officer who led the forum covering the following key points:

Approved Document L (on energy efficiency) was addressed and to achieve the Government’s Zero Carbon targets for new homes by 2050 the following options were discussed.
Option 1 – the immediate introduction of triple glazing as compulsory for new build
Opt 2 – move towards improved U value through improved products by 2025

The Group unanimously preferred Option 2 based on the following grounds. Firstly that Option 1 – compulsory triple glazing with immediate effect would be too difficult to achieve as the industry is not ready (in terms of manufacture, supply and installation) for this significant shift, though long term it should remain a goal. Option 2 – improving a properties U-Value would be the easier and more gradual process which would allow the industry to use improved and upgraded products/components to achieve the Government targets as proposed in the Consultation.

The GGF will reflect the above in its response.

Approved Document F (ventilation) was next on the agenda.

The practicalities of achieving the background ventilation requirements as per the proposal through the use of trickle vents were discussed. It was deemed that this would be difficult in the current systems and trickles vents available. The Group asked that the GGF explore this area further in its response to the consultation to gain greater clarification on the ventilation requirements as proposed in the Consultation.

The general consensus at the meeting was the GGF supported the Government’s agenda, plans and commitment to Zero Carbon by 2050 but will strongly recommend to Government that the Glass and Glazing industry will need at least 5 years to get set up to achieve the 2050 targets. It was unanimously agreed that the industry at present, is not in a position to achieve the targets proposed.

The GGF will issue a hard copy of the full response to the Future Home Consultation at the next Joint Window and Door Group and Conservatory Association meeting in Birmingham on the 6^th February, one day before the Government deadline of 7^th February for responses to this Consultation. To attend this meeting please contact technical@ggf.org.uk

The deadline to feed into the GGF response has now passed but Members can still respond directly to the Consultation.

You can view/download the consultation proposals by clicking here

The UK Pavilion at Fensterbau Frontale 2020

The UK Pavilion at Fensterbau Frontale 2020, hosted by the Glass and Glazing Federation (GGF) has been finalised with some of the UK glazing industry’s leading organisations co-exhibiting at the world’s largest international trade fair for the window industry. At Fensterbau 2020, the UK Pavilion will continue to be the number one destination for visiting UK companies. Situated in Hall 4A Stand 305, the UK Pavilion will occupy an 80m²space on the main thoroughfare between Halls 3 and 4.

As well as the GGF as hosts, the co-exhibitors who have signed up to the UK Pavilion are:

BSI (British Standards Institution) is the business standards company that equips businesses with the necessary solutions to turn standards of best practice into habits of excellence. We support clients throughout their journey to adopting standards, from the initial shaping of a standard to its embedding within an organization.
Clients use our services to access new markets and differentiate products and services with our testing and third-party certification. From standards to training, certification and BSI Kitemark, use BSI’s expertise to prove your capability and reassure your customers.

We’re also a Notified Body for CE marking offering companies around the world access to the EU.
For more information http://www.bsigroup.com/windowsanddoors

Business Pilot is a cloud-based system that gives you complete control of your business from anywhere, on any device built by installers for installers.
Whether it is the direct link from a website to Business Pilot or the temperature grading of leads, you will find tools to maximise your sales opportunities.
Running an installations office becomes easier too. You only need to see the interactive schedule board to see how. Installers even get an App to connect them to Business Pilot.
This intelligent linking extends into finance too meaning your finance manager will love the Business Pilot CRM / ERP system.
For more information visit https://businesspilot.co.uk/

Fenestrology is a Fenestration Practice of 4 like-minded individuals each with different specialisms pertaining to modern-day fenestration (Windows, Doors, Conservatories and roofline) Each individual having years of hands-on industry experience in their respective areas, they were persuaded by the industry to join forces under one organisation to offer a plethora of services under one roof. Services include Consultation, Management Services, Training, Qualifications, Conciliation, Pathology, Thermography.

We also retain the services of 4 Specialist Installation support teams that carry out Installation and Remedial works throughout the UK and Ireland. Our services are available to householders, installation companies, local authorities and social housing trusts
For more information visit https://fenestrology.co.uk/

Glazpart – the leader in plastic glazing accessories and ventilation
For 36 years Glazpart has been designing and developing plastic injection moulded products for the fenestration market. Glazpart have led the way working with system houses, fabricators and installers to provide optimum solutions.

Today with over 3,500 products we have the experience and knowledge to support any new product design and supply everything from setting and distance blocks to trickle vents whilst developing solutions for enhancing and adding value to fenestration products. Today we offer vacuum foiling of foils matching window system components.
For more complex components hydrostatic printed adds that finishing touch alongside an industry-leading plastic spraying facility.

For more information visit www.glazpart.com

GQA Qualifications – the Glazing Industry’s Specialist Awarding Body

Formal Qualifications are the hallmark of our education system; they signify that a person has achieved a certain level – an agreed, consistent standard, in their chosen field; they act as a barometer for third parties to benchmark that person against.

Beyond the field of education qualifications often disappear. As a person enters the world of work, qualifications are often replaced by training as a way of getting a person onto a job more quickly; in some circumstances, there is no formal or practical training at all, but the same ‘rules’ that are relevant to qualifications in the education sector are equally important – if not more so – in industry.
For more information visit https://gqaqualifications.com/

RITEC International – developer and manufacturer of the only complete system for glass renovation, ‘non-stick’ protection and maintenance

With almost 40 years’ experience, Ritec International is the pioneer and market leader for ‘non-stick’ glass surface technology.
Our award-winning ClearShield Eco-System® is specially developed to renovate, protect and maintain glass. It is powered by ClearShield®, the only glass surface treatment proven in durability and performance under all conditions. The ClearShield Eco-System® upgrades ordinary unprotected glass into ClearShield Eco-Glass®, a ‘non-stick’ easy-clean surface that maintains its ‘as-new’ sparkling appearance for much longer. ClearShield Eco-Glass® typically halves the frequency of cleaning.

With ClearShield®, glass processors and fabricators alike increase profits by offering a range of added value solutions.
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BLOG ARTICLE – TRIPLE GLAZING

KJM’s Managing Director Mark Pearce gives his personal views on Triple Glazing

In an age when energy prices are only heading in one direction, fitting your home with new KJM Veka 44mm Triple Glazed Windows can offer additional savings compared to standard ‘A’ rated double glazing. Well that’s the selling bit over and done with!

Triple glazed windows are still a relatively new concept in the UK. But in colder countries like Scandinavia, where homes endure extreme winter weather, they have been a standard fitment for many years. While we might not get the same severity of conditions, the UK does still suffer from harsh winters and of course increasing energy prices.

There are other ways to insulate your home like the roof, walls and floor, but neglecting your windows can result in cold spots and condensation. Personally I installed 44mm triple glazing in to my own home around three years ago and I have never looked back since then.

Some from within KJM would describe me as “KJM’s Triple Glazing King”, as I passionately believe in the product. I was even asked to speak at our national trade show about the benefits of triple glazing, but declined as it was over three days and in Telford, a long way from our base in Andover in Hampshire.

There are many benefits to installing triple glazing in your home but the important thing to remember is that all triple glazing is not the same. There are many systems available but to really get the maximum benefit then the gaps between the panes of glass should be 16mm and filled with argon gas.

Argon is an inert gas that reduces the heat loss through the panes. If the gap is reduced then the thermal performance is reduced, unless you start to use an expensive gas like krypton. So generally speaking the optimum size of a triple glazed sealed unit should be 4mm glass, 16mm gaps, so in our industry it’s called a 4/16/4/16/4 unit and that equals 44mm in total. You then need to factor in the number of chambers within the frame, the fewer chambers the less insulated the frame. The Veka system uses thermal inserts within the frame to improve the insulation further.

Are there any down-falls I hear you ask? The biggest problem I’ve encountered with my own windows would be external condensation on the glass. This happens because the external pane of glass is not being heated so well by your house, so if the glass drops to less in temperature than the outside air, then you reach “dew point” and condensation forms. It’s the exact reason that you get dew on your car windows. It will generally happen after a cold clear night and it would best be described as a light misting that forms from the centre of the pane, actually it’s in the complete opposite place it would form on the inside. This is because the glass in effect is being heated through the frame and spacer bar, so the outer edge of the glass is warmer than the centre.

When you get internal condensation it’s the opposite way, because in reverse the outer perimeter of the internal glass is the coldest. You can find that ‘A’ rated double glazing will suffer from the same problem, but the effects are much less. As I told my wife when she first spotted the external condensation “It just goes to show how well insulated our windows are”. They usually clear fairly quickly in the morning, so it certainly does not bother me. Further information on this can be found on this technical document from our glass supplier.

Light? Having three panes of glass, with two of them having a low e coating, there would be a drop in the natural light coming through the window as the low e coatings darken the glass slightly. Back to my own experience of my windows at home, from the old double glazing to the new triple glazing I did not notice any difference, so I expect this would only be detected with some some good light monitoring equipment.

Security? Three panes would have to be more secure than two, so there is an obvious difference. The middle pane of a triple glazed unit should be toughened especially if the glass faces a sunny elevation, at KJM we toughen all middle panes regardless of elevation. This helps with the stresses that occur with the heat build up within the sealed unit.

The next thing you might find on the internet about triple glazing is sound insulation. There is a lot of misinformation out there and many claim it improves sound insulation because they believe three panes are better than two. Scientific tests would show that if all three panes are the same thickness of glass then the benefit to sound insulation is very marginally better at best.

If you introduce one different thickness of pane, say one pane of 6mm glass and two panes of 4mm then this would improve the sound insulation more, because the different thicknesses will change the wave length of the sound as it passes through the window, thus reducing the sound transmittance. It would be worth pointing out at this stage that an open window will stop nothing and then there is my other pet-hate “trickle vents” that are notorious for leaking sound. That is a subject for another blog as there are better quality trickle vents on the market.

Extra weight from the glass is another problem, so oversized opening windows and doors are generally a “no-no” but traditional British casement window sizes have not produced a problem for KJM over the last few years, so we are confident in what we sell.

Finally did you know that you can buy the mainly recycled PVC system Veka Infinity in our triple glazing range? So if you really want to protect the environment then you can specify this system. Up to 80% of the core (the bits you don’t see) are made from recycled PVC, the important outside is manufactured from Virgin PVC in a very clever co-extruded process.

In summary I love triple glazing and I can see no reason why if you were changing your windows that you did not consider the option. Yes it costs more, but it will “future proof” your home and in the long term you will recoup your extra costs through the energy savings. It should also make your home much more attractive to potential buyers, if you decided to sell. At KJM it costs nothing to get a quotation and of course we can price for both ‘A’ rated double glazing and provide an additional upgrade cost to triple glazing.

If you have a comment to make or any information relating to this article please contact the GGF

Consumer Leaflets

Latest publication

All Publications > Consumer Leaflets

A Consumer Guide to Conservatories & Orangeries

A Guide to Trickle Ventilators

A useful guide for homeowners and window installation companies covering trickle ventilator basics.

Advice to Consumers Regarding Ventilation when Replacing Windows in Dwellings

Ventilation of a building must be considered when specifying the window or door products you want to install.

Replacement Windows and Doors Environmental Checklist

Key facts that demonstrate the solid case for choosing replacement windows and doors – one of the best choices you can make for any environment.

Condensation – Some Causes, Some Advice

Why condensation occurs on internal and external surfaces and some advice about how to control it.

Glass Repair

Professional advice on repairing damage on glass surfaces including the benefits of using a GGF Member.

PVC-u A Modern, Safe and Environmentally Sound Solution

A selection of key facts which demonstrate the distinctive environmental, technical and economic credentials for specifying PVC-u.

GGF Launches Safe Guide for Homeowners

The GGF is pleased to announce the launch of a much-needed consumer publication titled, “The Safe Guide for Homeowners – employing a glazing company to improve your home during the COVID-19 crisis”

Narrow Cavity Insulated Glass Units (IGU’s) with Reduced Spacer-bar Sightlines

Window Film – Application and Solutions

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Enjoy full access to GGF publications

Members of the Glass and Glazing Federation can view and download GGF publications for free on our website and benefit from significant discounts when ordering print copies from the GGF Shop.

> Learn more about GGF Membership

Window Installation

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Windows and Doors

GGF Glazing Manual > Section 6

GGF Data Sheet 6.1
Windows & Doorsets For- Dwellings – Safety
Safe working practices and regulatory compliance.

GGF Data Sheet 6.2
Windows & Doorsets for Dwellings – Security
Safe working practices and regulatory compliance.

GGF Data Sheet 6.3
Windows & Doorsets for Dwellings – Ventilation
This document describes aspects of the performance of windows and doors relating to the management of the quality of the air within a building by ventilation

GGF Data Sheet 6.4
Windows & Doorsets for Dwellings – Weather resistance
Companies will be able to assist with additional guidance on safe working practices and regulatory compliance.

GGF Data Sheet 6.5
Windows & Doorsets for Dwellings – Sound
Companies will be able to assist with additional guidance on safe working practices and regulatory compliance.

GGF Data Sheet 6.7
Guidelines for the Selection, Installation and Maintenance of Hardware for the Window and Door Industry

Provides information to assist the specifier and end user in the selection, installation and maintenance of window and door hardware.

GGF Data Sheet 6.8
Guidelines for the Selection, Installation and Maintenance of Screws and Fasteners for the Window and Door Industry

Provides information to assist in the correct selection, specification and maintenance of screws and fasteners.

GGF Data Sheet 6.9
Specification for the Performance of Door Assemblies

Provides a method for assessment of the performance of door assemblies.

GGF Data Sheet 6.10
Guidance for Surveyors and Installers for the Provision of Trickle Ventilation and Other Forms of Ventilation for Replacement Windows within England and Wales

Provides guidance for surveyors and installers on the provision of ventilation for replacement windows within England and Wales.

GGF Data Sheet 6.12
Design, Installation and Performance of Secondary Sashes made of Aluminium, uPVC or Wood

Deals with secondary sashes fitted to the room side of primary windows and which have frames made from aluminium, uPVC or wood or a combination of these materials.

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Enjoy full access to GGF publications with GGF Membership

Members of the Glass and Glazing Federation can view and download GGF Data Sheets for free on our website and benefit from significant discounts when ordering print copies of GGF publications online via the GGF Shop.

> Learn more about GGF Membership

Glazpart Ltd

Glazpart lead the way in the design and manufacture of Plastic Glazing Accessories for the Fenestration Industry with specialised knowledge in Glazing Accessory and Ventilation products to suit most needs. Glazpart offer a full service to facilitate customers individual needs from concept and design through to tooling and manufacture – Glazpart’s latest service is Surface Foiling of woodgrain effects and block colours which are proving to be extremely popular.

Trickle Ventilators
Flat, Bridge and Wedge Packers
Surface foiling – Vacuum and wood grain print
Plastic Window System Component Design
Bridge Packers

Hazlemere Window Company Limited Seeking More Experienced Staff Due To Expansion

Hazlemere are currently seeking to employ people in a wide range of positions. See below:
WINDOW & DOOR FITTERS
At Hazlemere, it is important to us that we deliver an exceptional service to our customers, so to achieve this it is vital that we have a team of talented and experienced window & door fitters. HWC is looking for both experienced commercial and experienced domestic window and door fitters. To be considered for the role you must have:

Previous quality fitting experience
A passion for delivering excellent customer service
Be a good communicator
Be self-motivated with the ability to work on your own initiative.
UK driving licence
MTC Card

PROJECT MANAGER
Purpose of the Role: Reporting to the Commercial Operations Director, the purpose of the role of Project Manager is to manage the commercial window and door installation process and installers to ensure that the companies numerous double glazing commercial projects are completed to an excellent level of customer services. To control customer debts and keep debtors list to an acceptable minimum. Key Responsibilities and Accountabilities:

1. To manage all installers to undertake installations within the KPIs set and agreed with the Line Manager.

2. Manage a number of Installation teams and any other resources required for the effective and efficient running of the department. Manage and maintain all HR responsibilities and employee and self-employed contractual obligations and enforce and monitor KPI’s for all staff within the installation system.

3. Provide accurate, regular and timely management information on customer records, completed installations and customer debtors.

4. Set communicate targets with the Installers and other members of the Commercial department.

5. Communicate and keep update all customers at point of Installation until completion and maintain excellent customer services.

6. Carry out any other duties that may be deemed necessary for the completion of the works by the company and/or the line manager.

7. Ensure that all customer contractual obligations are met.

8. Enforce and monitor all Health and Safety aspects on site and within the team, ensure all relevant training is up to date for all Installation staff

9. Deal with and resolve or delegate any on site issue as they arise.

10. Monitor and arrange as applicable relevant training to enable installer to carry out installations works

11. Raise, monitor, action and report on Non-conformances as necessary.

Personal Specification:

• Health & Safety Training to Management level

• CSCS card holder

• SMSTS Qualified

• Contractual and Health and Safety knowledge

WINDOW & DOOR SURVEYOR
The role of Window & Door Surveyor is part field and part office based. In essence, the role is to take a contract from the point of sale to the point where it is ready for order processing prior to installation. Duties include:

Making appointments with customers to carry out the survey.
Meeting with customer at their premises and reviewing the contract sold.
Discussing and confirming with client all choices regarding design.
Carrying out a comprehensive survey to determine manufacturing sizes.
Identifying any discrepancies between the contract sold and the final work to be carried out.
Liaising with Contracts Manager regarding any alterations to contract.
Drawing up survey to enable order processing and producing paperwork required for installation.
Qualities required include:

Previous surveying experience.
Good knowledge of current Building Regulations.
A methodical and accurate work ethic.
Ability to work under pressure and meet deadlines.
Strong communication skills, both written and verbal.
Good working knowledge of the window/conservatory/building industry.
Computer literate.
MTC card or equivalent.
UK driving licence.

CONSERVATORY INSTALLERS
At Hazlemere, it is important to us that we deliver an exceptional service to our customers, so to achieve this it is vital that we have teams of talented and experienced conservatory installers. To be considered for the role you must have:

Previous conservatory fitting experience
A passion for delivering excellent customer service
Be a good communicator
Be self-motivated with the ability to work on your own initiative.
UK driving licence
MTC Card

BUSINESS DEVELOPMENT MANAGER
Hazlemere Commercial, part of the Hazlemere Group are looking to recruit a new senior team member to join our busy Department working within the commercial sector: The Company has three decades of fenestration experience – offering both replacement and new build Windows, Doors and curtain wall facades. High Wycombe based. Duties to include:

New Business Development
Client Retention
Business Development Planning
General Management Responsibilities
Key Requirements:

Fenestration Industry experience essential
Previous leadership and motivational skills
Excellent communication skills, both verbal and written
A good deal of common sense, etiquette and ability to think on one’s feet
Ability to work without supervision and to work as part of a team
Advanced experience and knowledge of Microsoft office
This is a senior full-time position and carries a competitive salary, commensurate with previous experience and 22 days holiday, plus statutory holidays.

COMMERCIAL TRAINEE ESTIMATOR
Hazlemere Commercial is currently looking for a full time Commercial Trainee Estimator to join this busy Division of Hazlemere Window Company Ltd, working within the commercial window, door and curtain walling sector. Excellent attention to detail is required along with GCSE or equivalent Maths. Must be able to work within a team environment.

This position carries 22 days annual holiday plus bank holidays and various preferential employee benefits. Hours are 40 per week Monday to Friday based at the High Wycombe Head Office.

COMMERCIAL DRAUGHTSMAN
The role of Commercial Draughtsman is Head Office based. In essence, the main function of this job role is to produce detailed drawings utilising AutoCAD. Information for producing these drawings shall be extracted from either the Surveyors site details and measurements or architects drawings. In addition there will also be a requirement to process windows, doors and curtain walling through Sapa Logic and AluK Logikal software packages. As and when required the Commercial Estimating Department will require drawings to be produced to help the Commercial Division secure new work. This role also involves the requisitioning of items and materials i.e. aluminium pressings, brackets, Teleflex, folding openers, trickle vents, balances for sliding sashes etc. Duties include:

Assisting the Estimating Team in the submission of commercial tenders.
Discussing and confirming with the Estimating Team and Surveyors all client choices regarding design.
Requisitioning of items and materials for pilot windows, projects and commercial contracts.
Processing of windows, doors and curtain walling using software supplied by each systems house.
Producing comprehensive detailed AutoCAD drawings to manufacturing sizes.
Identifying any discrepancies between the contract sold and the final work to be carried out.
Liaising with each Surveyor, Project Manager and Operations Director regarding any alterations to contract.
Drawing up survey to enable order processing and producing paperwork required for installation.
Qualities required include:

Previous AutoCAD experience.
A methodical and accurate work ethic.
Ability to work under pressure and meet deadlines.
Strong communication skills, both written and verbal.
Ideally a reasonable working knowledge of the window/building/glazing industry.
Computer literate.

To apply email your CV and current salary to recruitment@hazlemere.co.uk Alternatively, please call Maha Urbanski on 01494 417731 to request an application pack and/or discuss any role.

The GGF Glossary

The Glass and Glazing Industry has thousands of products and components as well as companies. Due to its size and diverse nature, it’s also full of jargon and terminology that quite often varies from region to region, country to country, sector to sector and even in some companies from colleague to colleague.

The GGF Glossary is here to help anyone who needs help in understanding it all. It is by no means exhaustive and the GGF is aiming to update this page regularly. If you have and addition or feel something is missing then please contact the GGF and we’ll include it in the GGF Glossary.

Term	Definition
Acoustic Glass :	Glass that has been treated to improve it’s soundproofing qualities
Annealed Glass :	Annealing is a process of slowly cooling hot glass after it’s been formed, to relieve residual internal stresses that could cause breakage during manufacture. Annealing glass improves it’s durability
Approved Documents :	The Ministry of Housing, Communities and Local Government publishes guidance called ‘Approved Documents’ on ways to meet building regulations. These contain: – general guidance on the performance expected of materials and building work in order to comply with the building regulations – practical examples and solutions on how to achieve compliance for some of the more common building situations
Argon gas :	Double and triple glazed windows, commonly have argon gas between the panes to improve insulation and soundproofing. Argon gas is put into the glazing units because it is denser than air and therefore has greater insulating values than air.
Astrigal bars :	These are thin wooden moudlings placed on glass to create a period look. They are often used to create the traditional Georgian window look.
Awning windows :	These are casement windows that are hinged at the top of the frame.
Building Regulations :	Building regulations in the United Kingdom are statutory instruments or statutory regulations that seek to ensure that the policies set out in the relevant legislation are carried out. Building regulations approval is required for most building work in the UK. Building regulations that apply across England and Wales are set out in the Building Act 1984 while those that apply across Scotland are set out in the Building (Scotland) Act 2003.
British Standards :	British Standards are the standards produced by the BSI Group which is incorporated under a royal charter (and which is formally designated as the national standards body (NSB) for the UK). The BSI Group produces British Standards under the authority of the charter with the key objective being to set up national standards of quality for goods and services.
Casement window :	A casement is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay. Windows hinged at the top are referred to as awning windows, and ones hinged at the bottom are called hoppers.
Construction Products Regulation :	Often abbreviated to CPR, the Construction Products Regulation was started in 2013 under the EU but was fully integrated into UK legislation in 2019. This guidance is about placing construction products on the GB market. The GB market refers to England, Wales and Scotland. There is a separate Construction Products Regulation for Northern Ireland. Also in the Republic of Ireland, the CPR is under the EU. The CPR is the legislation that underpins CE Marking and UKCA marking of constrcution products.
Composite doors :	Composite doors are made of a selection of materials often including core products such as timber and uPVC. Each material is chosen for its specific properties with the aim being that when combined they will make doors stronger and more durable.
Curtain wall :	A curtain wall system is an outer covering of a building in which the outer walls are non-structural, it’s purpose being to keep the weather out and the occupants in. Since the curtain wall is non-structural, it can be made of lightweight materials, thereby reducing construction costs. Glass is commonly used as the curtain wall this offers the advantage of increased natural light. In some cases glass curtain walling can also be used to describe full floor to ceiling glass panels installed in an building’s interior. This is common in office spaces and commercial buildings.
Double glazing :	Windows which have two layers of glass with a space between them, designed to reduce loss of heat and exclude noise.
Double hung :	Often used to describe a sash window that has two vertical sliding sashes within the larger window frame. Each sliding sash closes/opens a different part of the opening and usually has counterweight on each side.
Emergency glazing :	This is a common description when a window or door has been broken or damaged and requires an emergency glazing company to make safe, either by replacement or boarding up until a replacement can be installed. The GGF criteria for emergency glazing companies is that they operate at all times (24/7, every day of the year).
Emissivity :	The emissivity of a glass surface is its effectiveness in emitting energy as thermal radiation. Many glass manufacturers reduce emissivity by coating glass, allowing heat to remain inside the house and also to prevent solar heat coming into a property and causing overheating.
Energy ratings :	These are used to assess the total energy performance of products such as windows and doors in the same way that household goods like fridges are energy rated using the rainbow label system. A window or door energy rating will not only measure the total energy loss, as a U-value does, but also the energy gain and the air leakage through the window or door. In the UK British Fenstration Rating Council are the leading company when it comes to window and door energy ratings.
Fabrication :	Fabrication is the manufacturing process of cutting and assembling the window profiles (frames) together and adding hardware (handles, hinges, locks) along with weatherseals and gaskets to make a finished window (or door)
Fan lights :	A fan light is a glazed opening above a doorframe or above the lintel in a doorframe. It is usually designed to allow natural light into a hallway or darker area of a building.
Fenestration :	This is the process of positioning, installing and fixing a window, door or skylight in an opening in any type of building.
Fire-resistant glazing :	Fire Rated Glass (also known as Fire Resistant Glass) is specialist glass that has been proven to provide a period protection against fire during a Fire Resistance Test. Fire resistant glass is used in Fire Resistant Glazing systems (with special fire resistant seals and components). Fire resistant glazing systems will only work to maximum performance if installed correctly. Certain types of fire rated glass will also provide a degree of protection (insulation) against the heat of a fire.
Float glass	Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and other various low-melting-point alloys have been used in this process. This method gives the sheet uniform thickness and very flat surfaces. Float glass is the most commonly used glass in modern glazing (windows/doors/conservatories and curtain walling)
Glazier :	A tradesman responsible for cutting, installing, and removing glass. They also refer to blueprints to figure out the size, shape, and location of the glass in the building. Glaziers may work with glass in various surfaces and settings, such as cutting and installing windows, doors, shower doors, skylights, storefronts, display cases, mirrors, facades, interior walls, ceilings, and tabletops.
Heat soaking :	Heat soaking. The process involves placing the tempered glass inside a chamber and raising the temperature to approximately 290ºC to accelerate nickel sulfide expansion. The process reduces the risk of spontaneous breakage.
Heritage windows :	A heritage window is a type of window that has been manufactured specifically to be installed in a heritage building or building within a conservation area. These type of windows are made with modern materials and used as replica or close to replica replacements for the original windows in historic (usually 100 years or older) buildings
Insulating Glass Unit (IGU) :	An insulating glass unit (IGU) consists of two or more glass panes separated by a vacuum or gas-filled space to reduce heat transfer in and out of a building. A window with insulating glass is commonly known as double glazing or a double-paned window, triple glazing or a triple-paned window, or even quadruple glazing or a quadruple-paned window, depending upon how many panes of glass are used in its construction. IGUs are often referred to as “sealed units”.
Krypton gas :	An inert gas commonly used to fill small air spaces (cavities) between glass panes, resulting in improved year-round thermal performance. Krypton gas is sometimes mixed with Argon gas to fill the vacuum between glass panes in the production of insulated glass units.
Laminated Glass :	This type of safety glass holds together when shattered. In the event of breaking, it is held in place by an interlayer, typically of polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or Thermoplastic Polyurethane (TPU), between its two or more layers of glass. The interlayer keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces. This produces a characteristic “spider web” cracking pattern when the impact is not enough to completely pierce the glass.
Lantern (roof lantern) :	Architectural lanterns are part of a larger roof and provide natural light into the space or room below. In relation to glass and glazing these are products that have a similar affect as skylights (roof windows)
Lightwell :	a lightwell, sky-well, or air shaft is an unroofed external space provided within a large building to allow light and air to reach what would otherwise be a dark or unventilated area. Lightwells may be lined with glazed bricks to increase the reflection of sunlight within the space
Low E Glass :	Low E stands for Low Emissivity. This is where glass has been treated to reduced energy being emitted from a building or into a building through panes of glass.
Mullion	A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively. When dividing adjacent window units its primary purpose is a rigid support to the glazing of the window. Its secondary purpose is to provide structural support to an arch or lintel above the window opening. Horizontal elements separating the head of a door from a window above are both a head jamb and horizontal mullion and are called transoms.
Processors (Glass)	Companies that buy flat glass and then put it through a process to make it perform differently. For example, to make it toughened glass through thermally heating.)
Profiles	These are the lengths of framing created by systems houses and framing manufacturers and are supplied to fabricators to trim and develop into window frames.
R-value :	the R-value is the term used for thermal resistance in a material. It is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive flow of heat. R-value is the temperature difference per unit of heat flux needed to sustain one unit heat flux between the warmer surface and colder surface of a barrier under steady-state conditions.
Rooflight :	A window built into a roof and sometimes referred to as a sky light. These are usually installed to increase natural light into an area (such as a loft) where there may not be much natural daylight.
Roofline :	This is a generic description for the products that are installed at the edges of roofs and include fascia boards, soffits, bargeboards, antefixes and cladding that forms the frontage immediately below the roof and the eaves of many homes and building.
Sash windows :	A sash window or hung sash window is made of one or more movable panels, or “sashes”. The individual sashes are traditionally paned windows but can now contain an individual insulated glass unit to create a double glazed sash window.
Security glass :	This is a specialist type of glass that prevents easy breakage and makes it difficult for burglars or intruders to enter a property. Security glass can be toughened glass (sometimes known as tempered glass), laminated glass or wire mesh glass (glass with wire mesh inside sometimes known as Georgian wire glass – not so common today).
Secondary glazing :	This is a glazing system that is installed inside a property when there are restrictions to replace the exterior windows. Secondary glazing often installed in historic buildings and is fixed to the sill inside the building. It
Self-cleaning glass :	Self-cleaning glass is a specific type of glass with a coated external surface that keeps itself free of dirt and grime. The field of self-cleaning coatings on glass is divided into two categories: hydrophobic and hydrophyllic. These two types of coating both clean themselves through the action of water, the former by rolling droplets and the latter by sheeting water that carries away dirt. Hydrophilic coatings based on titania (titanium dioxide), however, have an additional property: they can chemically break down absorbed dirt in sunlight. This is often an option for hard to access windows.
Sight line :	The perimeter of a window opening that admits daylight into living and work areas.
Single glazing :	A window that has one pane of glass. This type of glazing is usually found in older windows and is the least energy efficient glazing option.
Skylights :	A description often used for roof windows or rooflights
Solar gain :	Solar gain (also known as solar heat gain or passive solar gain) is the increase in thermal energy in a building as the glass (in a window) absorbs solar radiation via sunlight. This can cause overheating in a building.
Spacer bar :	A spacer bar is the thin hollow aluminium frame that separates the two glass panes in a double glazed window. The spacer bar is bonded to the glass panes via a primary and secondary seal, creating an airtight cavity enabling it to be filled with air or gas to reduce heat and sound transfer.
Tilt and turn :	Tilt and turn windows can be opened fully like a casement window (inwards) or they can be tilted from the bottom so that the top of the window is angled into the room, giving a smaller opening for ventilation. The tilted opening also has the added benefit of increased security and safety as no one can fit through the gap.
Trickle ventilator :	A trickle ventilator (sometimes called trickle vent) is a very small opening in a window that allows small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design – windows, doors, etc., are otherwise closed. Trickle vents are used extensively in the UK and Europe and are integrated into window frames to provide minimum ventilation requirements for naturally ventilated spaces.
Toughened glass :	Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass.
Triple glazing :	A insulated glass unit or window that has three panes of glass with two spaces (vacuums) separating the panes. The vacuums are usually filled with argon gas to reduce heat loss. Triple glazing can offer great security and can be more effective for thermal performance.
UPVC :	UPVC is an abbreviation or Unplasticized PolyVinyl Chloride and is a rigid, chemically resistant form of PVC used for pipework, window frames, and other structures. UPVC is sometimes referred to as PVC-U or plastic or PVC when describing double glazing.
U-Value :	U-values measure how effective a material is an insulator. The lower the U-value is, the better the material is as a heat insulator. U-values are generally used to describe the thermal performance glazing/windows.
Vertical sliders :	Another name for a double hung sash window
Warm edge :	A warm edge spacer is a type of spacer bar used in insulated glazing. It separates the panes of glass in double or triple glazing, or curtain walling and seals off the air cavity between each. Recent warm edge spacers are generally made from plastics, although stainless steel can meet the definition.
WER (Window Energy Rating) :	A rating systems led by the British Fenestration Rating Council (BFRC), that reviews the whole energy performance of a window, including all of its components. Ratings can go from highest triple A to lowest F and is presented in the rainbow labelling style often seen in white goods such as refrigerators
Window Film :	Window film is a thin laminate film that can be installed to the interior or exterior of glass surfaces in the interior or exterior in homes and buildings. It’s often used to increase privacy, solar control, safety and security or to block out strong sunlight. Window film should be installed by professional service companies to ensure best performance.

A Consumer Guide to Conservatories (Ref 35.1)

This 12 page A4 Consumer Guide to Conservatories, helps homeowners make the right choice. Careful thought and planning can help you to make the right decision when it comes to choosing and installing a conservatory that fits in with your home and suits the needs of everyone who will be using it. This guide is particularly useful for all companies wanting to provide more free but authoritative information to their customers.