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What about the join where he cuts the membrane in half on the other side of the upstand?
I’m using tilting velux in my roof (yeah I know they’re only meant to be used on >15deg pitch, but what the heck, I like living on the edge). I think what I’ll do is unroll the membrane across the roof without the windows fitted and mark the openings. Then roll back the membrane, fit the windows, glue, unroll, swear a lot and hope for the best.
Trunkie
NotThamesWater
This looks promising
https://www.youtube.com/watch?v=KxpCRTNYkSs