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Whatever idiot sparky the last owners of our house had in decided to create a hole big enough to fit a surface mount backbox into, then screw this at an angle to the solid wall behind. This gives an attractive finish on the wall where the socket sits at an angle with one end almost flush with the wall and the other proud by 3 cm.
I've replaced this with a double drywall backbox. Problem is the hole is now the correct width (after I enlarged it) but ~1cm too tall.
How would I go about filling in this 1cm gap below the sockets. Sockets are standard floor level. Can I gripfill a bit of ply to the back of the plasterboard to give me something to fill against? Will gripfill (or something similar) actually stick? Some other method?
Plaster?
Plaster to what though? It's just a hole currenly with nothing behind it.
Can I gripfill a bit of ply to the back of the plasterboard to give me something to fill against? Will gripfill (or something similar) actually stick?
Yes and yes.
And yes again, I've filled much bigger holes with a piece of ply and layers of polyfilla.
could potentially use expanding foam and some duct tape / card to control it.
Off cut of plasterboard. Sticky foam. (like expanding foam.) Dog a load of foam in. Wait for it to take. Press board into it. Dries solid
you said it was a solid wall behind so i'm assuming its been dot and dabbed over so easiest to just stick some plasterboard in with plaster, if its deep several layers with plaster between.