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I have to put a new ceiling in, I know to put the polysterine in first which i will use a spary adhesive to attch to the roof, but at each side of the ceiling i have joist to lay it on, but can not staple it, so I have to glue it, but cant put any pressure on to make it stick.

My idea is to do as i i have said but before i do this to make two tiny holes in the roof, which will be hidden by the cupboards, but a piece of plywood on the other side tied to string, so when i put the ceiling on, i can tie the string to bricks to pull the ceiling down to put pressure on the glue and it sticks.

What do you guys think or do you know a better way

This is a difficult one and I wouldnt have a clue where to start. I am interested though as I have a damp spot on the ceiling. The only thing I will say is that spray adhesive contains solvents and solvents melt polysterine so you may have to reconsider your adhesive.

Good luck Jan