Backer board very reasonable compared to a fail. In the olden days I'd had a few fails on ply either de laminating or just throwing a tile for no reason live surface. No fails on any of the dead surfaces.
try not to tile to ply but definitely don't tile to 6mm ply.
Ply is not the same as we got years ago, it's cheap crap now & has been for a while.
Overboard with thermal or Hardie or use a decoupler.
Backer board very reasonable compared to a fail. In the olden days I'd had a few fails on ply either de laminating or just throwing a tile for no reason live surface. No fails on any of the dead surfaces.
my only fail with ply was an 18mm bath panel which i forgot to prime... banana within 2 days. but there is my proof that 'live' material works.... ply works.... a bath panel if primed on both sides and then tiled can last for years and years standing vertical with little support....
as I am experiencing when the keraquick sticks to the plasticiser primer..... its a total swine to break the bond.
Not at all mate, just trying to steer you in the right direction, you've asked for ideas and in doing so we're simply pointing out that quite probably the fundamental failure here is the ply.
Plywoods a today have all sorts of problems one of the main ones being that a lot of cheap stuff comes in from Asia and is coated in releasing agents to prevent the sheets melting together in the heat of transport and tile adhesive dosent go very well with releasing agents, that's only one issue with it. Plywood and underfloor heating is a hell of a gamble in itself due to the contraction and expansion with temperature fluctuation. At the end of the day you'll do your own thing, we're only trying to point out why we as professionals don't like ply as a substrate and also the problems that you might face 🙂
my only fail with ply was an 18mm bath panel which i forgot to prime... banana within 2 days. but there is my proof that 'live' material works.... ply works.... a bath panel if primed on both sides and then tiled can last for years and years standing vertical with little support....
as I am experiencing when the keraquick sticks to the plasticiser primer..... its a total swine to break the bond.
marine ply is more expensive but good.... i take all your points on board (ply board ?) thanks guys.. i now work for a firm so if i can find an excuse to try out backer boards, i will... cheers.
