Hi I have this crack in the photo above my sliding doors that lead outside that has a crack across it If I push it it moves otherwise it looks and feels solid enough. Should I try and screw it from below or just fill and plaster over it? I've been using ready mixed plaster for other various parts of the house but have had to have 3 ceilings plastered so can't really afford to get them on again. Any ideas?
Well if it's moving and you plaster over it'll crack again. Remove the blown parts and see what's going on.
You could drill some holes in it at various points and use low expanding foam pumped in there. Seen that done many times. Would be rock solid then.
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