R
Rookery
So you want to fix big expensive quartz tiles onto a suspended unheated timber floor measuring about 7.0 x 6.0. Is that right? My method would be to:
1. Screw timber floor boards to joists.
2. Overlay timber floor with 6mm Hardie backer board.
3. Fix Hardie with appropriate screws and rapid set flexible adhesive.
4. Fix Ditra matting to Hardie with appropriate adhesive.
5. Tile away following manufacturers advice especially following grout size etc but I would imagine minimum 5mm joint. I would expect to see a similar movement joints too - both perimeter and intermediate ones. This is an expensive product so no short measures. Back skim every tile and set in with min 15mm notched trowel.
Of course others may disagree .......
1. Screw timber floor boards to joists.
2. Overlay timber floor with 6mm Hardie backer board.
3. Fix Hardie with appropriate screws and rapid set flexible adhesive.
4. Fix Ditra matting to Hardie with appropriate adhesive.
5. Tile away following manufacturers advice especially following grout size etc but I would imagine minimum 5mm joint. I would expect to see a similar movement joints too - both perimeter and intermediate ones. This is an expensive product so no short measures. Back skim every tile and set in with min 15mm notched trowel.
Of course others may disagree .......