I'm fitting a new bathroom (in what was previously part of a bedroom, with the remainder partitioned off to form a corridor to a new extension).
It's a 1930's, first floor, the joists are under spanned and the t&g boards are 3/4" - all appears to be pretty solid.
The floor will be tiled , probably in something large format.
I'm struggling to understand the process for the floor. I don't want to remove the existing boards, so as a starting point, should I do anything with them? - as a minimum check all are in good condition and securely nailed?
Assuming that's acceptable, what should I do next - the footprint means that a single sheet of 12mm (max, due to height issues) wbp ply would cover most of the trafficked area (less a 300mm strip on the back wall below the sink unit and wall hung WC) - if I did this (screwed through to joists at 150mm centre's) would I also need to glue it in some way?
I guess the alternative is these cement boards (I have previously used 6mm solid vertically to form a stud wall shower enclosure and I could sort of see the point of these vs plasterboard). I just don't see how they work on a floor - I keep reading that you have to glue and screw them down, is this with some kind of no-nails or do you bed them on an adhesive like tiles? And how do they help? Surely the fact that there's joints every 600/1200mm means movement and cracked tiles, I know people say they're waterproof but unless part of a fully tanked system the water will find it's way out anyway ? I'm happy to be pursuaded otherwise if they are a better option!
Thanks.
It's a 1930's, first floor, the joists are under spanned and the t&g boards are 3/4" - all appears to be pretty solid.
The floor will be tiled , probably in something large format.
I'm struggling to understand the process for the floor. I don't want to remove the existing boards, so as a starting point, should I do anything with them? - as a minimum check all are in good condition and securely nailed?
Assuming that's acceptable, what should I do next - the footprint means that a single sheet of 12mm (max, due to height issues) wbp ply would cover most of the trafficked area (less a 300mm strip on the back wall below the sink unit and wall hung WC) - if I did this (screwed through to joists at 150mm centre's) would I also need to glue it in some way?
I guess the alternative is these cement boards (I have previously used 6mm solid vertically to form a stud wall shower enclosure and I could sort of see the point of these vs plasterboard). I just don't see how they work on a floor - I keep reading that you have to glue and screw them down, is this with some kind of no-nails or do you bed them on an adhesive like tiles? And how do they help? Surely the fact that there's joints every 600/1200mm means movement and cracked tiles, I know people say they're waterproof but unless part of a fully tanked system the water will find it's way out anyway ? I'm happy to be pursuaded otherwise if they are a better option!
Thanks.
