Velux Window Leak in Sandtoft Flat Roof Information, help and tips on many areas of roofing including trusses, tiling, venting, insulation etc....

[rf22095]

Hi,

Ive installed a velux window in a self build roof this weekend which has a flat sandtoft 20/20 concrete interlock tile.

Ive fitted the recommended flashing from Velux but ran some water over it and found a very slight drip in the one corner.

I think this is because when I cut the foam back on the flashing I tried to cut it as low as I could to try and get the tile covering the flashing as flat as possible. I can now see that the there is a cap between the foam and tile close to the headlap of the tile.

I was thinking of filling these gaps with expanding foam as a solution, will this last and does anyone have any experience of a similar problem?

Thanks in advance.

[Makie-]

When you say you ran some water over it, what exactly did you do? Did you use a hose or did you pour it and if so in what way did you do either?