Discuss Best way of fixing boxes to crumbly walls..... in the UK Electrical Forum area at ElectriciansForums.net
What about surface mounting all boxes and sleeve it up the wall or across the wall using PVC conduitHi I'm doing a rewire of an old victorian terraced house built in the 1890s the plaster and bricks are extremely fragile even with a hammer and scutch chisel the brick just crumbles away leaving no solid fixing, what is the best way of fixing boxes back square? I've thought about expanding foam but will that not expand and push the boxes back out?
It's hard to see from the picture but the brick is all jageded and in pieces.
View attachment 103260
What about surface mounting all boxes and sleeve it up the wall or across the wall using PVC conduit
Another vote for that solution. Bonding with a bit of cement in the mix.Spray it with water and slap some bonding in there.
If you want it to go off quick mix a bit of cement in with the bonding and it'll go off in no time.
Bend out the nock outs this creates a much better hold . But again , bonding on a ground floor might not be a good idea . It draws in any dampAnother vote for that solution. Bonding with a bit of cement in the mix.
Do make sure the box is set level. The mix goes off extra quick and hard, so there’s no adjustment later!
Either drill through the box and screw to fix - after the bonding has set!
Or pop out a couple of the knock outs. The bonding will come through a bit into the box and hold the box firm.
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