I've never had any issues with using dynabolts. I've also found that if its bolted on the second floor (i.e the floor underneath is internal) then they're happy for it to be 10mm coach screws into the floor and wall.i have never been allowed to dynabolt into concrete or not have bolts into wall 2 in the floor and 2 in the wall at least as always been enforced i use 12mm bolts,
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