I've been chasing out some back boxes ahead of my electrician coming in to re-wire my flat, and some of the bricks behind the chase have crumbled, leaving some quite large gaps behind where the back boxes are going to go.
I remember hearing somewhere not to use bonding to fix them in, as it can attract moisture (i'm in a basement flat so could be an issue)
Should I use a sand/cement mix to fill in behind the back boxes? And if so what ratios would anyone reccomend?
I remember hearing somewhere not to use bonding to fix them in, as it can attract moisture (i'm in a basement flat so could be an issue)
Should I use a sand/cement mix to fill in behind the back boxes? And if so what ratios would anyone reccomend?