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Hilti do various resin bolts. Few different ways of doing it. I'm sure Fisher do a similar thing. Basically if you can't go up one more size, then get resin bolts, clean hole out thoroughly, set them as per instructions. Usually they need held with a bit of preload on them till they set in the right place. Unwind nuts and fix your load on them.
BrickMan
Dramatic_Hammer
Bit of a nightmare this weekend attempting to fit a mantlepiece. Long story short, having tried two sizes of expansion bolts, I’ve now got one hole too large for the 10mm fitting and one too large for the 12mm fitting.
Why does drilling masonry create such a bloody mess?! Am hesitant to continue boring because of the carnage.
Is there a magic polymer solution I can use to stick the bolts into the wall? Mantlepiece not load baring, just needed for nik nak display.