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The Importance Of A Three 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.

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 three degree pitch should be used (the maximum being 30o).

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

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 three 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 three 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.

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4.85 Average

250 Reviews


Looks great. Very solid, good quality. Service was wonderful, delivered in a couple of days as promised

Posted 1 week ago


We purchased a flat roof light last year and we're so glad we did. It's made such a difference to the light we get into the room and looks amazing too. Top product and great results. Our builder was impressed with it too and how quickly his question was answered when he was installing it.

Posted 1 week ago

As part of my build project I researched many companies looking for good quality skylights and a company that could offer both opening and fixed skylights. EOS fitted all my requirements. Both Elliot and Chris were consummate professionals in dealing with my queries and ensuring I got my delivery on time. The skylights were solidly constructed and we love them. The only thing I will say is that if you order a bespoke size, make sure you can wait 6 weeks from order to delivery.

Posted 4 weeks ago


Very pleased with rooflights . Easy to fit . Great communication both when ordering and delivering. Would definitely buy again.

Posted 1 month ago


Brilliant company to work with, always ready to assist, and very good communication. Excellent product, of great quality and looks brilliant, well pleased. Thanks to all at EOS

Posted 1 month ago


Delighted with our rooflights. EOS did everything they said they would do when they said they would do it. We were a bit nervous about doing our own fitting but we got precise, practical instruction diagrams and all went very smoothly

Posted 2 months ago


Excellent rooflights and easy to fit

Posted 2 months ago


Excellent product, delivered on time. Would certainly use this company again,

Posted 2 months ago

Rooflights are high quality and fixing instructions clear.

Posted 2 months ago


A great product. The speed and efficiency of the online purchase and then the delivery of the items made the process a hassle free pleasure that is all to rare these days.

Posted 2 months ago


From ordering to receiving our rooflight everything went great, we built the upstand ourselves from the drawings supplied and the light fitted perfectly. Excellent product at a great price. Wish everything on our extension went that well. 5 stars all round.

Posted 2 months ago


Hi, excellent service and they added solar control without additional charge.

Posted 3 months ago

Clearly a top quality roof light which is beautifully made. I looked at several manufacturers and the EOS had the best insulation among those I looked at. The frame is substantially made and the glass perfectly set into it. It was really simple to fit and the superb drawings allowed me to construct the kirb with confidence and accuracy. Delivery was fast and the unit well supported and protected on a pallet.

Posted 3 months ago


Very impressed with dealing with EOS, great quality product, courteous and good communication which helped make my decision to purchase the 2 Roof lights I needed from them. Thanks for your help.

Posted 3 months ago


Roof lights turned up day we asked for van driver was very helpful and in position look great !!!

Posted 3 months ago


Great product and customer service

Posted 3 months ago


I was really pleased with the quality of the roof lanterns I ordered 2mt x 1mt and 1.5mt x 1mt. We have all heard the old saying you only get what you pay for and this product is spot on ,great build quality would highly recommend

Posted 3 months ago


I always get my sky lights from EOS. They are reliable, friendly and very good quality. There technical help is invaluable. Richard Abbey Building

Posted 3 months ago


We recently bought an opening roof light 1 metre x 1500 and a fixed roof light 1 metre x 1500 and we have found EOS Rooflights very competitive in price and of high quality also technical advice was very good.

Posted 3 months ago


In the middle of Covid 19 lockdown they were able to advise, honestly estimating the future timing of delivery. I had to wait, which was not surprising, but their service was very personal.

Posted 3 months ago


Very good quality flat roof windows , good seling-advice service , fast delivery.

Posted 3 months ago