Mum and dad have a long flat garage roof. It doesn't leak, but a small pool of water gathers in the middle. Mum wants to 'do something about it'. It's about 20mm deep, and in the winter never dries up.
I thought we could either lift the depression from underneath, by hammering small wedges between the beams and the boards.
Or pour something on top of it, in the hope that it will solidify, and thus make it flat.
Can anyone say which would be better, or maybe suggest something else?
Ta.