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NotThamesWater
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.