hi all. converting my loft, house was built in 2000 with attic trusses already in. building control want 10mm ply, then pre-bonded chipboard - foam floating on top of this. i've read the regs, and i interpret them as not being required for a private dwelling? thanks for any help. robby
You do have to have a degree of soundproofing of walls and floors within dwellings, though not as much as between dwellings. For your floor, you would be looking at boarding of mass about 15kg/sq.m., which is something like 22mm t&g chipboard, with 100mm quilt between the joists. What your inspector is suggesting is a bit over the top BUT, as Stonyboy said, it's often not worth arguing the point ovr a relatively small detail, as they can make life difficult in other ways!