Flat roof windows use a different design entirely to pitched roof windows, built to handle standing water and a completely different flashing approach.
Why Flat Roofs Need a Different Product
On a pitched roof, water sheds away naturally. On a flat roof, a window needs to be raised on an upstand and designed to shed water actively, since there's no natural pitch to rely on — using a pitched-roof product on a flat roof is a recipe for leaks.
What to Consider for Flat Roof Windows
- A product genuinely designed for flat roof application
- Correct upstand height to manage standing water
- Flashing compatible with your specific flat roof covering — EPDM, GRP or felt
- Positioning that avoids low points where water naturally collects
How We Install Flat Roof Windows
- Assess the flat roof covering and falls. Understanding how water currently moves across the roof.
- Specify the correct upstand and window. Matched to the specific flat roofing system in use.
- Install and flash to the roof covering. Integrating properly with EPDM, GRP or felt, whichever is in use.
- Confirm drainage around the window. Making sure water continues to move away, not pool around the new opening.
Have a flat roof and want more light below? We'll specify the right product for your specific covering.
View Velux Windows →Why Choose Atlas Roofing Cheshire
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We're a domestic and commercial roofing team covering Cheshire and the Wirral, based near Chester, so we know the area and can get to you quickly. Every job comes with clear pricing before work starts and workmanship you can rely on.