J
jmt tiling
hi all, looking for some advice. have an upstairs bathroom floor to tile approx. 4m x 2.5m. Existing floor is 20mm t&g chipboard fixed at 400mm centres with no noggins along theentire lenghts of joists. Not in any way ideal to start with! After screwing, there is still some deflection but not as much as i expected. the customer wants u.floor heating which i will lay on 10mm marmox, slc over top, then tiles as normal.
however, this has left me with a quandry, do i:
1 - overboard the chipboard with 12mm or 18mm ply, then marmox etc.
2 - fix 20mm marmox straight to the chipboard, then ufh etc.
3 - take up all the chipboard, noggin at 280mm centres, relay 18mm ply, then marmox etc.
i know that ideally option 3 would be the way to go, however, there is so little deflection in the chipboard now that it is screwed, i wonder if overboarding with 12mm ply would stiffen the floor up to a satisfactory standard, and save me a lot of time and mess.
any advice would be greatly appreciated, as i have just about pulled out what little hair i have left trying to decide! cheers, jim :mad2:
however, this has left me with a quandry, do i:
1 - overboard the chipboard with 12mm or 18mm ply, then marmox etc.
2 - fix 20mm marmox straight to the chipboard, then ufh etc.
3 - take up all the chipboard, noggin at 280mm centres, relay 18mm ply, then marmox etc.
i know that ideally option 3 would be the way to go, however, there is so little deflection in the chipboard now that it is screwed, i wonder if overboarding with 12mm ply would stiffen the floor up to a satisfactory standard, and save me a lot of time and mess.
any advice would be greatly appreciated, as i have just about pulled out what little hair i have left trying to decide! cheers, jim :mad2: