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If I had the bits on hand, gluing some lolly sticks behind the hole at least stops it all falling out the back. A bit fiddly tbh. If you can get the filler to hold and don’t mind doing a couple fills that might be the most straightforward.
Nef-
Don’t think I’ll be able to get filler to stick to the rear plasterboard. I could glue some lolly sticks but, at 20mm, it’s not easy to even get a finger in there to fix one in place.
Current plan is to place a dab of expandable foam to the rear of the plasterboard on the other side of the cavity then use that as backing for the filler.
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Matches, string and super glue should get you there a bit easier. I leave the details to each person's imagination.
Soul
Grumpy_Git
Gripit fixings can fuck right off. They fail all the time and they’re a complete pain to fit. Wish I’d never used them 5 years ago when we moved in.
Now I’ve got to fill 6 of them this week. They’re 20mm holes.
What’s the best way to pack them out before filling or can I just build up some toupret quick dry stuff?
Expandable foam?