Think it was common on stone solid walls to provide a degree of insulation in the cold north. With bricks, it's easier to make a cavity wall.
fixing metal back box in stud wall
Aug 06, 2015
42 Replies
I have not seen any with pre-drilled holes. Do they have to be placed anywhere in particular? Not on the knock out obviously! I'm guessing two per side (on the long side of a double box)
I put the battens down the narrow sides of the box. Uses less timber.
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