@freddiemercurystwin - I agree, and that may well happen, ultimately.
@Harry Bloomfield - what is one o' they?
Not bothered about light from above - we have two big windows and a double door giving us plenty of that already.
Woody - I've tarped it more than once. Last time I did it so well, it held water on the roof and stopped it draining off into the gutter! A tarp and bricks/sand-bags wouldn't hold in strong winds. We're a bit of a wind tunnel here and storms have twice taken the tarp off - even with bungies...
Hi Foxhole. Agreed. This we already know, but we are where we are with it. I want to flash-tape the windows to stop the leak(s), however minor, at the lower end - but I don't want to exacerbate the issue by blocking any channels that drain rainwater to the lower end. You can see my hasty sealant...
So, we've been having leaks for nearly 18 months on our garden office, which has velux-equivalent windows on a flat roof, when they're meant to be on an angle of 18 degrees (I think?).
While we wait for the builders to come up with a meaningful and final solution, I want to flash-tape the...