What is a Timber Upstand &
How Can I Build One?

If you are adding a skylight to a flat roof, you must decide on whether to construct your own upstand or purchase one from your rooflight supplier. Here you can find some helpful information to help you make your decision.

An upstand (sometimes referred to as a Kerb) for a rooflight is a raised structure that plays a crucial role in weatherproofing, insulation, and structural support. Positioned between the rooflight and the roof surface. Its Main purpose is to allow the weatherproofing membrane to come up 150mm high to stop water ingress and pass building regulations.

Should I make my Own?

Cost is generally the main reason people choose to make their own. A simple upstand can be constructed from excess timber on site minimising waste or using standard timbers found at any local wood supplier.

A more advanced detail is the equivalent of creating a mini stud wall. The purpose of this is being able to insulate the inner cavity which gives greater thermal performance and sound insulation.

Choosing a Pre-Made Upstand

Whlie a pre-made insulated upstand can be a little more expensive a purpose manufactured version has numerous benefits including improved thermal performance, weathering and air tightness. The frame has been designed and engineered to fit your exact rooflight giving you peace of mind that your skylight is going to fit perfectly.

At EOS, our upstand arrives pre-made and packed full of insulation, constructed using OSB for longevity and features and fitted gaskets to ensure no moisture finds its way into your home.

If you would like more information on our how we can help then you can explore our product range here.

infographic on what is an upstand and how can i build one. See a build up of roof and timber upstand

How do I build my own Upstand?

If you are looking to build your own upstand for one of our stock skylights you can see the process below. When creating your upstand make sure the width is correct size for your rooflight as these can very from 60mm to 100mm depending on the system you order.

Please Note – If you select a lantern rooflight you do not need to add a pitch to your upstand.

Made to Measure Sizes

Our insulated upstands are available in both stock and made to measure sizes. We can offer either 150mm high (for cold roofs) or 300mm high (for warm roofs) plus options for both flat top plates (for lanterns) and 5 degree top plates (for flat rooflights)

Discover the benefits of warm and cold roofs and their impact on rooflight upstands. Optimize your roofing system for efficiency.

Benefits of warm and cold roofs

Again our technical drawings section of the site will help with dimensions, however if you need any bespoke drawings please let us know.

Have any questions about upstands? Head on over to our Contact Page to get in touch with our team or take a look at our Fixed Rooflights, Opening Rooflight, Lanterns, Modular or WalkOn Rooflights pages for more information.