Should I fit one? I've got plenty spare but can see it will be messing about with that gap it creates compared to just coming up with blockwork and cavity batts then plonking window board on top, but don't want to upset building inspector!
Yes, it needs the blockwork bringing up, either level with the bottom of the cill if I have to fit a closer or nearer to the top of the cill if the board can go straight on.
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