It's a slightly counterintuitive fact about roof windows: the glass and frame get all the attention, but it's the flashing kit around the edge that actually determines whether the installation stays watertight.
What a Flashing Kit Actually Does
The flashing kit forms the weatherproof seal between the window frame and the surrounding roof covering — tiles, slate, or whatever material is in use. Without a correctly fitted kit matched to that specific covering, water finds a way in at the edges, however good the window itself is.
Why We Only Use Manufacturer Kits
- Designed and tested specifically for that window model
- Matched to different roof covering types — tile, slate, or flat
- Covered by the window manufacturer's own warranty when fitted correctly
- Proven far more reliable than improvised flashing solutions
Signs a Flashing Kit Has Failed
- Water staining around the window frame internally
- Visible gaps or lifted sections around the window externally
- Damp appearing after specific wind directions or heavy rain
Concerned about flashing around an existing roof window? We can assess and repair it properly.
View Velux Windows →Why Choose Atlas Roofing Cheshire
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.