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Hi all, Looking for a bit of advice on cavity trays above a roof abutment. I've had an extension built and the builders skipped the cavity tray. They've gone bust so I'm left to try and find a solution. The building inspector has picked up on it, and said it really needs to be there. The plans...

Hi all, How would I go about closing this cavity in a thermally efficient way? (The window is temporary). I've looked at cavity closers and various window details, but usually the block work is level between the inside and outside. The builders left it like the (before they went bust). I guess...