We're about to lay about 60 sq M of floor tiles over a suspended floor in out holiday cottages. Now the floor is 9"x2" joists, and although it was waterproof flooring chip board we've ripped it up and are replacing it with
18mm ply to give as rigid a floor as possible. For peace of mind I'd prefer to put a layer of decoupling membrane, but it's unbelievably expensive - about £450 for that area. (unless someone knows a more economic source). What is the panels experience of tiles over a suspended floor? The room I'm in at the moment was conventional joists and chipboard, tiled over without a membrane, and the tiles were ok for the five years before we refurbished, and again we laid 18mm ply but as it was a small area I put in a membrane.
AWEM