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?
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