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When homeowners use a GGF Member company to carry out windows, doors or conservatory work, they are investing in professional workmanship and service of the very highest standard. Companies requiring flat glass or glazing products from a GGF Member can also be assured they are dealing with the best companies in the industry. So if you are wanting to improve your home or property, or simply need a glass and glazing product or service, why not browse our directory and contact a GGF Member Company in your area.

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Search Results for: double glazing

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Cyril Isaacs & Co Ltd

| 18.09.17

Well established family run business trading for over 50 years.
We specialise in all types of glazing in the commercial sector right through to domestic applications. Fire glass installation, secondary glazing and mirror installation are our specialty.

  • Glazing Contractors
  • Fire Glass Installation
  • Secondary Glazing
  • Mirror Installation
  • Double Glazing Installation

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

East Grinstead Glass Works Ltd

| 18.09.17

East Grinstead Glass pride ourselves on listening to our customers and endeavouring to meet their needs.
Small Family Run Business
Established 36 Years
Double Glazing & Conservatory Specialists

  • PVC-U Windows & Doors
  • Aluminium Windows & Doors
  • Conservatories
  • All Types of Glass Cut To Size
  • Leaded Light Repairs

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Gatley Glass Ltd

| 18.09.17

Family run since 1972, Gatley Glass present our customers with high quality PVCu, hardwood and aluminium windows and doors and are one of the leading companies installing Manchester Double Glazing whilst maintaining an unrivalled standard of customer service.

  • High quality window and door installer
  • Full range of repairs undertaken
  • Replacement glazing, including double glazed units
  • Full range of roofline: fascia, soffit and guttering
  • Glass cut to size while-u-wait

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Glazerite Ltd

| 18.09.17

Suppliers and installers of quality PVCu and Aluminium,Windows, Residential,Patio and Bi-Folding doors. Domestic and Commercial projects.
Specialist technical advice and support.
Conservatories,design,installation and planning package.
The complete double glazing service

  • Quality
  • Service
  • Specialist
  • Advice
  • Assurance

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Barn Glass Group Limited

| 18.09.17

Barn Glass, a family business with a proven track record over the last 68 years, has been the first choice for many specifiers, architects and contractors who require good quality rooflights, patent glazing, double glazing, bi-fold and sliding doors, conservatories, and glazed atriums.

Serving Surrey, London and the Home Counties, we have successfully transformed the homes and businesses of many thousands of customers.

Our team have over 120 years of experience between them, giving clients the professionalism and knowledge to help you. We are proud of our excellent reputation and with the wealth of knowledge and expertise we have gained in this time being associated within the glazing industry, we are able to work in partnership with our clients to choose a product and design that will meet their exact requirements.

Our membership of the relevant professional and industry bodies, let you know you are safe in the knowledge that you are dealing with a reputable, service led Window Company, of long standing and financial security.

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- Local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Clearway Doors & Windows

| 18.09.17

Established in 1983, Clearway Doors and Windows have been installing windows and doors for over 30 years, growing from a small, two-man
business to our present size.

As a thriving double glazing company with specialist manufacturing facilities, we employ more than 30 people, including sales, manufacturing, surveying and installation experts. We have a wealth of experience across Gloucestershire, Worcestershire, Herefordshire, Oxfordshire, Wiltshire. which means you are never too far from a satisfied Clearway customer.

Every product is made to measure and made to last. What’s more, we manufacture our own aluminium frames in our factory in Gloucester, so you can see your windows and doors being made using the latest techniques and facilities, to the highest quality standards. By buying direct from the manufacturers you get competitive prices on the products you want.

ASHI Group Ltd

| 18.09.17

With 50 years experience in the Home Improvement market, manufacturing your tailor made products in our UK factory, you can rest assured that you are transforming your home with a reliable brand. We are a National Company providing a local service with over 100 local showrooms. With over 1 million happy customers all over the country, Anglian Home Improvements is the market leader in double glazing and triple glazing, front and back doors, conservatories, orangeries, roof products and more .

  • National company- local service
  • Home Improvements – Windows, Doors, Conservatories, Orangeries, Extensions, Rooftrim & Garage Doors
  • Robust & solid Guarantees on all our products
  • Over 1 million customers, we are highly recommended
  • Bespoke products-Made in Britain

Crystal Home Improvements (Head Office)

| 18.09.17

ABOUT CRYSTAL

Crystal Home Improvements covers London, the Home Counties and the South East of England yet despite this we are the 17th largest window fabricator and installer in the UK (source: Insight Data).

Established in 1995 Crystal is a family-oriented business and enjoys an unblemished trading history of 22 years.

Putting customers first is at the heart of the Crystal philosophy, hence our emphasis on training and our “Treating Customers Fairly” policy. “The Crystal Way” ensures world-class customer service in fulfilment of orders, as well as prompt after-sales service and providing total peace of mind through our comprehensive “no quibble” 10 year guarantee.

We can maintain our high standards because we control every stage of the process ourselves. Crystal windows and doors are manufactured at our own premises in Romford. Our own personnel carry out each stage of the process from the manufacture of our products, installation and after-sales service.

We are a responsible and ethical company which believes in providing the very best products and service, as shown by our current 96.4% recommendation rate on the Review Centre website and 9.1 out of 10 Trust Score rating.

We are members of TrustMark, the Double Glazing and Conservatory Ombudsman Scheme, FENSA and the Glass & Glazing Federation. This gives our customers complete peace of mind and protection.

We have also created a range of finance packages to help our customers, including low-rate finance and a “Buy Now, Pay Later” package enabling buyers to defer payment for 12 months.

OUR PRODUCTS

Our main products are:

• High energy rated double glazed windows (A + for standard casements)
• A huge range of composite and panelled external doors
• Bi-fold doors
• Porches
• Garage doors
• Rooftec insulated conservatory roof replacement panels
• Roofline products including fascias, soffits, bargeboards and guttering

Whatever your window requirement, Casement, Tilt & Turn, Sliding Sash or Bay, Crystal is able to satisfy you. Our priority is to ensure we always deliver in 3 objectives; great aesthetic looks to enhance your home coupled with great energy efficiency and high security too. Crystal is one of the leading providers of PVCu doors in the UK. Our doors come in a range of shapes and sizes made to measure the requirements of your household. Using the latest production techniques, our innovative range of PVCu doors ensure your security with a locking system that is second-to-none, offering a 6-point system incorporating anti-bump, anti-stick, anti-snap and anti-drill lock cylinders. Crystal always use the highest quality materials including only using Pilkington glass.

Our very popular and current PVCu patio and bi-fold doors are slim-line, smart and very durable, they let in light and give a room a clear view to the space outside.

A new product we are particularly excited about is our Rooftec insulated conservatory roof replacement panels which are an innovative solution to the classic Too Hot, Too Cold problem many conservatory owners will recognise. No other solution is as effective, affordable, quick and flexible as Rooftec from Crystal. Every Rooftec roof is tailor-made to fit each conservatory and can be fitted in a single day. The roof panels have fantastic insulation properties turning the conservatory into a comfortable room useable 365 days a year, come snow or heat wave.

Installing modern windows while keeping a vintage look

| 13.04.17

The owners of this home needed council approval to replace its windows. Find out how GGF Member companies helped them get it and how they now enjoy the benefits of modern energy efficient glazing.

mokoia house case study masterframe scotia double glazing

For homeowners that live in buildings of architectural importance replacing windows is a challenge – how to enjoy all the benefits of modern energy efficient glazing while respecting the aesthetic requirements of their properties.

That was the case with Mokoia House, which overlooks the 17th green at Royal Troon Golf Club in South Ayrshire. The owners of a flat inside the building wished to upgrade their windows though needed to seek council approval to do so.

As with so many councils, South Ayrshire does not favour PVC-U in buildings of architectural importance, but as the prestigious golf club had recently had Vintage Collection sash windows approved and installed, installer Scotia Double Glazing and manufacturer Masterframe sought a meeting to see if a third floor flat, part of the existing building in Crosbie Road, Troon, could also have PVCu sash windows fitted.

As each building is decided upon on its own merits, it was far from a forgone conclusion. The local planner noted that this property was “very distinctive and has been listed for its local importance”.

New sash windows to match existing windows

sash windows mokoia house troon golf club scotia double glazing masterframe

Happily for all concerned, Scotia Double Glazing demonstrated to the council the rigorous levels of quality and detailing that go into the Vintage Traditional window including authentic detailing such as mechanical butt jointed construction, astragal bars, exclusive cam catches, and internal ovolo beading.

The product, in a colour scheme to match the existing windows, along with Scotia’s sympathetic installation technique and internal finishing, would be enough to convince the Councillors to approve the installation.

Happy customers enjoy the benefits of new windows

The homeowners are delighted by both the standard of the installation provided by Scotia Double Glazing and the quality of the windows manufactured by Masterframe, which they found to be a vast improvement on the previous models, in terms of thermal performance, weatherproofing, security, noise reduction and most importantly appearance.

Need advice on replacing windows in your home? Find a local GGF Member company today.

More:
A guide to window styles
Advice on ventilation when replacing windows
Energy efficient glazing: A useful guide
When to repair or replace your windows

GGF Proposed Response to Government Consultation on PRS MEES

Members News, News, Politics | 25.04.25

1. Do you agree with government’s preferred position of using new alternative Energy Performance Certificate (EPC) metrics following EPC reform as the basis for higher Minimum Energy Efficiency Standards (MEES) for privately rented homes?

We agree with this approach as it would be consistent with the proposed EPC reforms.

2. Government would welcome views on options for setting future MEES against a combination of new EPC metrics. Do you agree with government’s preferred approach of having a requirement to meet a primary standard set against the fabric performance metric and then a secondary standard set against either the smart readiness metric or heating system metric, with landlord discretion on which secondary metric their property meets?

We agree with the preferred approach that landlords should be required to meet a standard set against the fabric performance metric as a primary standard. 

It is important that a ‘fabric-first’ approach is undertaken as a primary measure, before considering any secondary measures such as changing the heating systems or the introduction of smart-readiness. 

Windows and doors must be considered as a Fabric measure as this will be an opportunity to replace those that are an early generation and poorly performing. Older double-glazed windows allow three times as much heat loss compared to modern high-performance double or triple-glazed windows. 

It is estimated by the Glass & Glazing Federation (GGF) that there are over 80 million double-glazed windows in the UK housing stock that do not comply with current Building Regulation standards.  It is imperative that these windows are upgraded to improve the fabric performance of homes and prevent energy being wasted through poor insulation.

Simple checks can be undertaken to determine the age of windows and doors and the corresponding thermal performance.  The FENSA (Competent Persons Schemes) database holds information on over 16 million replacement window and door installations in England and Wales. In addition, the presence of energy efficient low-emissivity glass can be detected using low-cost hand-held ‘matchbox sized’ glass coating detectors. Both of these methods can easily be used by EPC Assessors without adding significant complexity or time.

Effective windows and doors are more important than ever as we transition to low carbon heating systems such as heat pumps to retain the heat from radiators working at a lower temperature compared to conventional heating systems.  If windows and doors are not upgraded at the same time as the installation of a heat pump, then the running costs can become high compared to current conventional heating systems which will lead to tenant and homeowner dissatisfaction and resistance to change.

Fabric improvements including replacing windows and doors will benefit tenants by lowering energy costs and could maximise future rental opportunities for landlords as potential tenants increasingly search for more energy efficient properties.

We have a thriving UK based window and door industry the majority of which are based in North of England.  Over 100,000 skilled jobs are supported in the industry, the supply chain is reliable and secure and is an important contributor to the UK economy.

3. What are your views on the alternative approaches of:

Alternative 1: A requirement to meet a standard set against dual metrics of equal weighting. The standard would be set against dual metrics including two of the following: fabric performance, heating system and smart readiness.

We do not agree that the proposed metrics for heating systems and smart readiness should have the same weighting as that of fabric performance. 

If this were to the case it could lead to landlords making incorrect decisions such as replacing the heating system when the fabric is poor and would do little to address heat escaping from the property and the resulting increase in energy bills for occupants.

Occupants are very concerned about the cost-of-living, and the financial pressure of energy utility bills is especially concerning and urgent for many people living in rented accommodation; it is very important that measures are implemented wherever possible to alleviate this pressure for tenants.

Alternative 2: A requirement to meet an overarching standard set against all three metrics of fabric performance, heating system, and smart readiness, either through improvements across all standards or through landlords concentrating improvements against one or two standards.

We do not agree with this alternative because it is likely to result in landlords inadvertently addressing heat decarbonisation measures without any impact on fuel poverty alleviation.

4. Do you have any alternative suggestions for how government could utilise new EPC metrics as the basis for MEES, such as a single metric approach (e.g. fabric or cost based?) Please provide a rationale with your answer.

No.

5. Do you agree with government’s proposal to increase the maximum required investment for Private Rented Sector (PRS) MEES to £15,000 per property and for landlords to be able to register an exemption if expenditure would take them over this figure? If not, please set out whether you consider a cap should apply and how; and if so, what level you consider the cap should be set at and why (whether this is the 2020 proposal of £10,000 or another figure). Please explain your answer.

We agree with this proposal. A lower figure (e.g. the 2020 proposal of £10,000), would definitely limit a landlords ambition to improve the energy efficiency of their properties and stop them  implementing several measures at the same time. 

6. Should government extend the exemption period for the cost cap to ten years? If not, how long do you think the cost cap exemption should last? Please explain your answer.

No. We believe that ten years is too long to postpone further improvements to meet the minimum standards.  We support the retention of the current exemption period of five years otherwise a huge opportunity to reduce carbon emissions associated with the property and energy bills for the tenants will be missed. 

7. Do you agree with government’s preferred implementation timeline to require ‘new tenancies’ to meet the higher standard from 2028 and ‘all tenancies’ to meet the higher standard by 2030? If not, do you have alternative suggestions?

With reluctance, we recognise that the revised implementation timeline may be necessary to allow sufficient time for landlords to meet the new requirements. With the housing stock in the UK, widely recognised as being the worst in Western Europe we must seize the opportunity to introduce this key action to improve the energy performance of the existing housing stock.

8. Do you agree with government’s proposal that, as an EPC reform transition measure, landlords should be able to demonstrate their properties are compliant with the existing standard of EPC E using their past EPC?

We believe that it would make sense to upgrade old EPCs given the proposal to update the EPC assessment methodology to a more accurate system.

9. Do you agree properties that have an EPC rating of C against the EER on EPCs before 2026 should be recognised as compliant with the future standard until their EPC expires or is replaced?

We believe that it would make sense to upgrade old EPCs given the proposal to update the EPC assessment methodology to a more accurate system.

10. Do you agree with government’s proposal to require landlords to commission a new EPC before taking action to comply with higher MEES?

Yes

10.1. Should the cost of this new EPC be included within the cost cap?

Yes

10.2. Should landlords still be required to commission post-improvement EPCs? If yes, should the cost of the post-improvement EPC also be included within the cost cap?

Yes

11. Should government develop an affordability exemption? If yes, what eligibility criteria would be the most appropriate for an affordability exemption? Please indicate which, if any, of the proposed approaches you support or otherwise provide alternative suggestions.

We do not agree that exemptions should be necessary, provided that a sensible timeframe is proposed.

12. Should government apply the PRS MEES Regulations to short-term lets? Please explain your answer.

If because of the outcome of the consultation on ‘Reforms to the Energy Performance of Buildings Regime’, short-term lets are required to have an EPC, then we agree that they should be included in the scope of the PRS Regulations.  Short term lets should be subject to the same energy performance requirements as longer term rental properties to address the below par UK building stock.

13. What actions could government take, including changes to the law to encourage or require smart meters in properties undergoing efficiency upgrades, to increase the number of smart meters installed in the PRS? Please provide your rationale and evidence for any suggestions for actions you have.

No comment

14. Do you think the current MEES exemptions available to landlords are suitable? 14.1. Are there other circumstances, not covered by the current MEES exemptions regime, where you think government should consider making exemptions for?

By raising the cost cap to £15,000 more properties will be captured compared to the current requirements.  Any exemptions should be last resort otherwise we will fail to address the serious challenge of improving the existing building stock.

15. Do you agree with government’s preferred position to keep a potential requirement on lettings agents and online property platforms under review whilst the PRS Database is being developed for properties in England?

Yes.

16. Do you have any new evidence to submit regarding the topics as summarised in Chapter 2 of this consultation? Please specify which topic you are providing new evidence for.

No comment

17. Is there any additional information or evidence you would like to provide on either the effectiveness of the existing PRS regulations 2015 and guidance, or interactions with other policies?

No comment

Low-E (Low Emissivity) Glass and Thermal Efficiency

| 22.12.23

Learn about Low-e glass and how it contributes to energy efficiency, as well as how it can perform under certain conditions.

 

What is Low-e glass?

Low emissivity glass is glass that has an invisible microscopic coating applied to it in order to improve its thermal efficiency.

How does Low-e glass improve thermal efficiency?

Low emissivity glass is an essential part of most energy-efficient windows and doors. It has a surface coating that operates as follows:

  • It allows short wavelength heat from the sun to enter your home through the glazing.
  • This solar energy works with your domestic heating system to warm up your room, which then gives off long-wavelength heat radiation.
  • A large proportion of that longwave heat would vanish back out through windows made of ordinary glass. However, the Low-e coating reflects that heat back into your room so the heating system does not have to work as hard to maintain comfortable room temperature.

Will Low-e glass meet the Building Regulations?

Better than merely meeting the Building Regulations, Low-e glass will enable you to both achieve and surpass the new targets for windows and doors.

What other characteristics should I be aware of?

Whilst there are significant advantages to selecting thermally efficient Low-e glass for your home, there can be some side effects under certain conditions.

Tint

Recent innovations in creating neutral Low-e coatings minimise the phenomenon of light coloured materials (such as net curtains) appearing slightly darker when viewed through the glass.

Haze

This phenomenon may occur at times of the day when the sun is at a particular angle or under some lighting conditions. It can also be influenced by the type of Low-e coating used.

External condensation

Thermally efficient windows are so good at keeping the heat in that the outer pane can get cold, as it is no longer being warmed by wasted heat.

Under some weather conditions and at certain times of the year, this can result in the formation of condensation on the outside surface of the glass. This is a positive indication of a thermally efficient window.

Hue

Depending on coating type, glass substrate and glass thickness, some slight colour or hue differences may be noticeable on Low-e glass.
This may be more evident when one double or triple glazed window unit is replaced in a home, as the Low-e coating will likely be slightly different (i.e. from a different batch) from those on the other window units.

Overheating

Certain Low-e glass is good at solar heat gain, harvesting free heat energy from the sun, helping to reduce heating demands. In some situations, this can cause overheating resulting in an uncomfortable environment.

It is recommended that a combination of Low-e and solar control glazing be considered for large glazed areas, particularly south-facing conservatories. Guidance should be sought from the manufacturer or supplier.

For more advice about energy efficient windows and other glazing home improvements, contact a GGF Member company near you.

Conservatories and energy efficiency

| 22.12.23

A well-designed conservatory can be incredibly energy efficient – improving the level of comfort in your home, helping you save on your monthly energy bill and offering environmental benefits all year round.

A buffer zone for your home

Adding a conservatory to your home can help reduce your overall energy use by creating a ‘buffer zone’ between indoor and outdoor living areas.

Any heat that escapes through your home’s walls into the conservatory will help create a warm space on colder days.

That’s not all, the captured heat can then re-heat the main building on cold days when the doors between your home and the conservatory are opened.

This buffer effect of storing naturally produced heat is an easy way to be environmentally responsible and save on your energy bill.

Improved thermal efficiency

A conservatory can be designed with varying degrees of thermal efficiency. When planning your conservatory, talk to your local GGF Member about the following:

– External quality double glazed doors between your home and the conservatory can provide added thermal performance and security

– Low-emissivity coatings on the inside face of double glazed windows can reduce heat loss from radiators inside the structure. This is strongly recommended for north-facing conservatories.

– Solar control layers can control glare and the amount of the sun’s energy that is transferred into the living space. This is specifically recommended for south-facing conservatories.

– Heating appliances with their own thermostatic controls will allow you to separately control the conservatory’s temperature.

– Designing in natural ventilation such as trickle ventilators, top opening windows or roof vents is far more economical (and environmentally friendly) than air conditioning.

Green credentials of a typical conservatory

The materials typically used to build a conservatory feature a large percentage of recycled material. In addition, the key materials used within your conservatory are all recyclable at the end of the conservatory’s life.

– Aluminium (this can be the conservatory itself or its structural elements) is recyclable with up to 95% being reused.

– PVC-U profiles used in the side frames are 100% recyclable and can be reused numerous times.

– Timber can be fully recycled, and must be responsibly sourced.

– Glass is 100% recyclable.

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