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The Importance Of A Five Degree Pitch

With any roofing structure, one of the main objectives will always be for it to be designed and built to prevent water and dirt from pooling on the glass. This rule applies to any rooflights you may want to install as well.

Selecting the correct angle for your installation will make all the difference in the long run, especially when it comes to extending the working life of the structure.

Let Gravity Work For You

Everything boils down to simple physics, as it is only natural that water and dirt need to be able to easily roll off of the fitting to prevent further damage. In the event that you devote considerable time and resources to installing a skylight, while at the same time forgetting to place it at the correct angle, you could see your investment wasted.

Wall abutment detail of modular roof light with upstand for ease of install

When discussing the benefits of flat rooflight installations, it would be very easy to assume that this would need to be installed with a completely zero degree angle. However, in this instance, ‘flat’ should not be entirely ‘flat,’ as this would lead to excess dirt and water having nowhere to go and run off.

If you picture spilling a glass of water onto a regular table, you will notice that it just stays there until it is mopped up – this is far more complicated to perform on a flat rooflight! Instead, a minimum of a five degree pitch should be used (the maximum being 30o).

How Do I Work Out the Pitch?

Determining the correct pitch is crucial for efficient water runoff in your flat glass rooflight. A five degree pitch, equivalent to a 9mm rise every 100mm or 87mm rise per meter, can achieve the desired 5 degrees. However, it’s essential to consult with your supplier. Factors such as glass thickness and rooflight span must be considered, especially for larger rooflights, which may require an increased pitch, potentially up to 15 degrees. Ensure a precise calculation to optimize the performance of your rooflight installation.

what is 5 degree pitch for an rooflight upstand

Where to Add the Pitch: Top vs. Bottom?

If you’re crafting your flat glass rooflight, ensure you place the pitch at the top, where the upstand meets the rooflight. This positioning is crucial for optimal aesthetics. Some rooflight offer flat upstands, prompting you to add the pitch at the bottom, thereby altering the upstand’s angle.  For a seamless and efficient rooflight solution, prioritize proper pitch placement at the top.

Avoiding Excess Build Ups

There are two main reasons for not wanting excess water and dirt to remain on a skylight for any extended period of time.

First of all, water pooling and evaporating on the flat surface will leave watermarks on your glass, not a good look.

More importantly, the dirty and stagnant water could result in the growth of algae and other unwanted substances on the surface of your skylight – at the very least this will be an unsightly and therefore unwelcome addition to your property, severely restricting the light passed through to your interior. With an angle of five degrees, the water and dirt will simply wash away.

Protect Your Home

If you believe that mould and other growths are enough of a problem on the outside, you may also be interested to know that seeping moisture from a damaged roof could end up damaging the internal walls and ceilings below.

Interior mould and moisture is far more than just an aesthetic issue, and it can actually pose a serious health hazard. Over a long time, constantly breathing in these poisonous ingredients has the potential to lead to severe respiratory illnesses, and it is therefore sensible to protect any building with a five degree roof slope.

To achieve the desired angled you may be able to place the upstand directly onto the roof firrings. Firrings give a flat roof its fall, this will translate the roof pitch onto the roof light. Alternatively if your fixing onto level roof joist, firrings will need to be placed under the upstand or the pitch can be built into your upstand if yourself or your builder is building it.

Exceptions When Pitch Isn’t Needed

Not every rooflight requires a pitched angle. For walk-on rooflights, a flat design is acceptable, but regular cleaning is essential to maintain clarity. If your roof already features a 5-15 degree pitch, the upstand is generally flat, allowing the rooflight to seamlessly follow the roofline. At EOS Rooflights, we offer upstands in both flat and pitched designs to suit diverse installation needs.

modular walk on rooflight with wall abutment split into 2 units

Avoiding Excess Build Ups

There are two main reasons for not wanting excess water and dirt to remain on a skylight for any extended period of time.

First of all, water pooling and evaporating on the flat surface will leave watermarks on your glass, not a good look.

More importantly, the dirty and stagnant water could result in the growth of algae and other unwanted substances on the surface of your skylight – at the very least this will be an unsightly and therefore unwelcome addition to your property, severely restricting the light passed through to your interior. With an angle of five degrees, the water and dirt will simply wash away.

Protect Your Home

If you believe that mold and other growths are enough of a problem on the outside, you may also be interested to know that seeping moisture from a damaged roof could end up damaging the internal walls and ceilings below.

Interior mold and moisture is far more than just an aesthetic issue, and it can actually pose a serious health hazard. Over a long time, constantly breathing in these poisonous ingredients has the potential to lead to severe respiratory illnesses, and it is therefore sensible to protect any building with a five degree roof slope.

To achieve the desired angled you may be able to place the upstand directly onto the roof firrings. Firrings give a flat roof its fall, this will translate the roof pitch onto the roof light. Alternatively if your fixing onto level roof joist, firrings will need to be placed under the upstand or the pitch can be built into your upstand if yourself or your builder is building it.

If you are in any doubt about the most effect design for a rooflight, albeit flat or otherwise, it is reassuring to know that our team of experts at EOS Rooflights are available to answer any questions that you may have.

Our expertise are built upon our many years of experience in this field, and our team combined have been responsible for countless quality roofing installations. To get in touch by telephone, simply call 0208 462 3557, or we can also be contacted directly via email.

Contact our team

If you have any questions, would like a bespoke price or want to enquire about our installation service. Give us a call or drop an email:

Call EOS Rooflights today 0208 462 3557

Eamil EOS Rooflights Today [email protected]

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4.83 Average

320 Reviews

Phil

We have had several eos rooflights (possible 10-12) over the last 5-6 years. Every one has been as it should be. Received in perfect condition, delivered on time. And the roof-lights are well made and look perfect once fitted. Company is also very helpful if help is required. I’ve seen cheaper alternatives supplied and fitted by others but they are inferior quality. These are

Posted 1 day ago

Alison Smith

Very happy with your service

Posted 1 day ago

Anonymous

Very efficient sales team

Posted 1 day ago

Kieran

Needed a large bespoke roof light upstand made and they managed to turn it around in a day! Great company, would definitely use them again. Thanks

Posted 2 days ago

David Kingston

Great company to deal with, made the process very simple, delivered on time and fitted perfectly

Posted 2 days ago

Anonymous

Easy to deal with, the pricing was great and delivery of 5 skylights was quick and stress free. One small problem was quickly resolved, great company.

Posted 5 months ago

Justin David Davis

Great product despatched and delivered very quickly

Posted 5 months ago

Anonymous

Great rooflights

Posted 5 months ago

Anonymous

Recently purchased an electric roof light from EOS. Very happy with the finished product, study and functions very well. It also looks very stylish. I received excellent customer service from EOS at all stages, they couldn't have been more helpful. Highly recommended.

Posted 7 months ago

Anonymous

Great Rooflights , simple to fit and swift delivery, many Thanks

Posted 8 months ago

Liam Grenander

Very professional customer support / sales team. Dealt with our roof light enquiry quickly and kept me updated on transit and delivery. Will be purchasing roof lights from them again when our projects require them.

Posted 8 months ago

Brad Lander - Bailand Construction Ltd

EOS Rooflights were knowledgable in their field, very helpful and the products (Roof Lantern and Flat glass roof lights) were of a good quality. The Roof lights were easily installed and full installation instructions were supplied for those who are installing for the first time. Would recommend.

Posted 8 months ago

A Memet

Very efficient with processing my order and delivery. I ordered a 3M roof lantern and a smaller flat roof light. Both were simple to install on my own upstands and they both look great. My only negative was the cost was a lot for what they are but I don’t think eos are excessively expensive, I think the roof lanterns themselves are what’s pricey. Anyhow I’m happy 😃

Posted 11 months ago

Leo

EOS were brilliant all through the consultation/sales process and delivery. The skylight looks great and works a treat with the electronic switch. Their after-care support was also very helpful and patient when we mistakenly thought we had an issue. Would highly recommend them.

Posted 1 year ago

Jonathan Tregidga Buyer at Legacy

As a company we have used EOS for some time. We use the EOS Rooflight Flexi Lid product a lot and also the EOS Smoke Vent Rooflight AOV on our projects. We cannot fault the company for the service, communication and value for money.

Posted 1 year ago

Tom

Excellent products, great customer service and post sales support! Unfortunately the courier damaged our roof lights slightly, however EOS went above and beyond to rectify! Special mention to Natalie O’Hara in ops, she was so helpful, prompt and a real pleasure to deal with! Highly recommend EOS!

Posted 1 year ago

Anonymous

Great delivery, great product. Really helpful customer service to organise the delivery of the rooflight

Posted 1 year ago

Wayne

My Eos rooflight turned up on time as always, simple to install and looks great, throws so much light into what was a dark space, the quality of the rooflight is amazing, I will continue buying from Eos in the future,

Posted 1 year ago

Clive Woodford

The rooflights are a key feature externally of the property as they are prominent on the flat roof. They are angled by 15 degrees to allow the south facing sun to enter the house maximising natural light and also utilising any solar gain. The majority are triple glazed, with a couple of larger opening lights being double glazed. Internally they provide so much light and the light shafts are a characteristic of the internal architecture given that there are 15 within the house. The ordering and supply process was straightforward and installing them worked well with the pre-made upstands. All in all a very satisfactory and successful decision to select Eos rooflights.

Posted 1 year ago

Mr Jones

I was after rooflights with laminated glass and of good quality! I contacted EOS after seeing and viewing their products. They fitted the requirements. The service was first rate, nothing was a problem and the drawings to work before delivery excellent. Would highly recommend.

Posted 1 year ago

Matt Wilson

Great quality rooflight, delivery was as planned and on time. We will be using this company again.

Posted 1 year ago