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Rooflights: What Are U Values and Why Are They Important?

Increasingly, new build projects as well as existing buildings are maximising the use of natural light together with the thermal properties of modern glass, to create a revolution in how we look at heat retention and accessing light sources.

When you consider the costs involved in paying for artificial light and heat, especially at a time when energy prices are soaring so significantly, rethinking our approach to and reliance on these basic needs makes a lot of sense.

A U value tells us how much heat is lost from a building through different elements, such as windows, walls and floors.

It is a measurement of heat transference, also known as the “overall heat transfer co-efficient”, meaning the higher the number value, the more heat is being lost, and the less environmentally friendly the building is. A lower value therefore indicates greater insulating properties and is more energy efficient.

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If you would like further information about EOS, our products and how we can help, why not request a brochure.?

Calculating the U Value

The U value of a building element is calculated by working out heat loss for each component of the building. This is determined by the material used, its thickness, and its positioning.

Current building regulations in England and Wales allow for all non-domestic applications, the worst acceptable standard for the thermal performance (U-value) of rooflights in new build work is stated as 2.2 W/m2k. For refurbishment or domestic applications, this figure is reduced to 1.8 W/m2k.

Rooflights are made up of a number of different component materials that each have different properties when it comes to heat transference. Therefore, to find out the U value of this type of element, a number of factors need to be determined.

It is simply not enough to state the glass centre pane U value of the glass unit as this does not represent the U value of the entire rooflight product.

Equally, thermal comparisons between competing rooflight products can only be made when U values for the whole rooflight are considered. A poorly designed triple glazed rooflight product may in fact perform worse than a well-designed double glazed product albeit the centre pane U value of the triple glazed glass unit may be better than that of the double glazed glass unit.

Energy Effecient Rooflights.

Energy efficiency is at the core of our product range at EOS, each of our rooflights boasts U Values significantly lower than current and future building regulations. Our standard fixed products boast a 0.97 W/m2K U Value whereas our ECO Range is tested to a market leading 0.65Wmk system U Value.

In fact our U values are so low that official building standards permit you to increase the amount of glass within your roof area.

So, as well as flooding a building with daylight to naturally enhance the indoor environment, EOS rooflights ensure green energy efficiency by reducing the need for CO2-emitting artificial lighting, whilst guaranteeing that heat isn’t lost unnecessarily.

For green efficient skylights with low U Values, speak to the EOS Rooflights team today

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4.85 Average

273 Reviews

Jonathan Tregidga Buyer at Legacy

At Legacy we design and build quality homes and properties. A Key part of this is to have a product that fits the bill and EOS rooflights have never failed to impress us on the quality of the item and the staff at the office also never fail to impress. If you need a fixed rooflight then you could do far worse than go with these guys.

Posted 3 days ago

DH construction

The help on the information on there roof lights is brilliant product quality and packaging is really good tooWould recommend Great all round company

Posted 1 week ago

Bob

Great customer service and fantastic product. Delivery and communications were excellent. Competitive pricing and manufactured to the exact sizes we supplied. Roof light looks amazing in our hallway. Would certainly recommend this company.

Posted 1 week ago

Janet

I researched several roof lights and found that Chris Higgins and his colleagues at EOS provided the best technical advice and were happy to address my questions quickly. I purchased the roof light in September 2021. It was very heavy and there were issues with the delivery schedule which was stressful due to the additional manpower I needed to offload etc. EOS customer service did address the issues and I am delighted with the quality of my new roof light. I would like to thank Chris, Natalie, and the team for their help.

Posted 5 months ago

BrianHowarth

We are very happy with both the product and the service we received from the company. The roof light is of excellent quality at a competitive price and the customer service was excellent. It is always good to be able to contact a company once you have ordered a product and this was certainly the case with EOS Rooflights Ltd. Unlike a number of other companies we have had to deal with during our building project.

Posted 7 months ago

DaveRafferty

Great product and excellent service from EOS

Posted 7 months ago

JohnWalsh

I sent in the order for the roof light and received delivery in 4 weeks, at the moment anything that includes glass is taking ages so I was surprised when it turned up on time.

Posted 7 months ago

AndyHill

We have used EOS Rooflights on a couple of projects now and will continue to do so. The quality of the frame which is welded, and the glass connection, is second to none, and this makes for a trouble-free installation. Hillbuilt Construction

Posted 7 months ago

DanielRogers

I did a lot of shopping around when trying to find the right product for our extension roof and the EOS Flex electric stood out in terms of price and overall quality. The ordering and delivery process was fantastic (within a week it was with me) and it took less than an hour to install. Really happy with the quality and finish so wouldn't hesitate in recommending to anyone looking for similar

Posted 9 months ago

SandraSanderson

over the moon fits like a glove , excellent service, and delivery

Posted 9 months ago

StevenJohnson

Fast friendly services. Top quality product. I am 100% confident when I recommend EOS rooflights to my clients.

Posted 9 months ago

MarkLaws

We are very pleased with our EOS Rooflights Our Builder was also very impressed with the quality and will use them in future

Posted 11 months ago

AlexanderWhite

Im very happy indeed. Instructions were clear, it went on a treat and looks great.It was a pleasure dealing with you, I shall recommend you

Posted 11 months ago

Anonymous

Very helpful customer service

Posted 11 months ago

JustinGourley

Most importantly of all, a great product - smart and clean design - looks superb. Service was excellent, very responsive - addressing questions quickly and adapting the design as needed. Fully recommend

Posted 1 year ago

Anonymous

We have had very good service from you delivery on time and fitting very easy.We are now enjoying the benefits of having the room flooded with light.Many thanks

Posted 1 year ago

KateAllen

EOS where very helpful throughout, the pricing was competitive with all the quotes we received and the walk-on rooflight was exceptionally well made. We prepared the opening using EOS details and plans and it came exactly as described and fitted perfectly (this seems obvious but surprisingly doesn't always happen). I would 100% use them again and would recommend EOS to others without hesitation. I am extremely pleased with the finished rooflight and it looks brilliant installed. My contractor said it was perfect and came exactly as described too, so good all round.No pictures at present but can provide later! It looks fab!

Posted 1 year ago

Anonymous

EOS supported with

Posted 1 year ago

AshleyNicholson

perfect , elegant and simple which is what we wanted. looks good. Builders told me easy to fit and fiiting instructions were appreciated as they were very clear

Posted 1 year ago

AsifAhmed

Excellent service, I had a few questions regarding installation and these were answered very quickly, very happy to recommend EOS!

Posted 1 year ago

NicoVatnikaj

Very happy with the service on time no delays

Posted 1 year ago