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Quoting for a rewire on a property that's going to be fully tanked to 1.2 m.
Back boxes in before or after tanking?
Back boxes in before or after tanking?
Discuss Chasing in and tanking. in the Electrical Forum area at ElectriciansForums.net
Just imagining you cutting through the tanking to put in a back box, or putting retaining screws ... I worked in an undersea road tunnel once and all drills were kept under guard
Neither I believe surface mount and stick them on as there should be no holes in the membrane, if they are screwed in then the damp will penetrate to the back box via the screws.
Is there an architect involved on the job?
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If you "damage" the membrane then you will be up sh!t creek without a paddle.
Hope fully the ones doing the boarding didn't drill through the membrane.......Double sided sticky tape in true Blue Peter fashion.
I've never worked on a tanked installation, but don't they frame out in timber after the tanking? Then you run cables and fix boxes within the frame as normal. No damage to membrane at all
I did a temporary supply with basic CU and small radial and light circuit when a building was being refurbed. they literally dug around the house and put a thick coat of latex type stuff on the outer walls of the basement, then coated in sheets of polystyrene and then coated that in a thick rubbery substance before back filling... once set it was 100% water proof, this with all layers ended up around a foot thick, on the inside they did something similar but much thinner,starting with the floor, it made the basement like a giant plastic tray... set forward from the lining inside was metal stud work on which dry lining etc sat on. it allowed them to put an extra flat in the basement and made them quite a bit of money. its quite common around here with so many basements being converted to accommodation from storage.The use of plastic or rubber membrane to contain water is simple enough for even me to understand, but shouldn't it be on the outside? In the case of a wet room the walls support the membrane from any water pressure, but how can this work in a basement built below the water table? Does my head in .
thats far too much common sense and straightforward for the stasi building control folks in bath... if there is a roundabout way of doing something they will dictate that is the way and god help anybody who might suggest otherwise!I've done wiring in such basement rooms where we've chased as normal first then the chases are coated with the tanking compound and the tubing and boxes fixed in with the cement rendering.
The use of plastic or rubber membrane to contain water is simple enough for even me to understand, but shouldn't it be on the outside? In the case of a wet room the walls support the membrane from any water pressure, but how can this work in a basement built below the water table? Does my head in .
Reply to Chasing in and tanking. in the Electrical Forum area at ElectriciansForums.net
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