Replacing Existing Floating Floor

[hmtiling]

Doesn't the Wedi board have decoupling properties?

 

[Just Rizzle]

the reason for using 2 x20 mm boards is this from my experience of kitchens the chances are you will have a load of pipe work running over the floor between the insulstion. the first layer you would run up to the pipe work and between it . the second layer at 90 degrees to the 1st bridges these gaps it also allows you to level the floor if the sub floor is uneven by using wedi there is no need for ditra as it effectively decouples and waterproofs so no need also for dpm plastic up the walls as the tanking takes care of that. I have done a couple of floors were ive used this method and done them both in a day.
another way would be to rip up floor cover with a dpm then screed out with 40mm semi dry screed and bed the tiles in using cement sbr slurry that's the way I would of done it 20 yrs ago and again all done in a day

 

[jmm]

the reason for using 2 x20 mm boards is this from my experience of kitchens the chances are you will have a load of pipe work running over the floor between the insulstion. the first layer you would run up to the pipe work and between it . the second layer at 90 degrees to the 1st bridges these gaps it also allows you to level the floor if the sub floor is uneven by using wedi there is no need for ditra as it effectively decouples and waterproofs so no need also for dpm plastic up the walls as the tanking takes care of that. I have done a couple of floors were ive used this method and done them both in a day.
another way would be to rip up floor cover with a dpm then screed out with 40mm semi dry screed and bed the tiles in using cement sbr slurry that's the way I would of done it 20 yrs ago and again all done in a day

I have 4 pipes: 1x water, 2x waste and 1x capped gas. The two board solution is interesting. Ideally I want to lay the least amount of board possible (i.e. once at 40mm). But this will difficulties around the pipes.

DPM on the walls too instead of a plastic sheet then.

Removing the need for Ditra would save several hundred pounds. I guessing the foam acts as the decoupling between the two backer boards.

Given the price of Wedi, would going back to (cheaper) Marmox board do the same job? The specification seem very similar (if anything the Marmox seems stronger).

 

[Just Rizzle]

I have 4 pipes: 1x water, 2x waste and 1x capped gas. The two board solution is interesting. Ideally I want to lay the least amount of board possible (i.e. once at 40mm). But this will difficulties around the pipes.

DPM on the walls too instead of a plastic sheet then.

Removing the need for Ditra would save several hundred pounds. I guessing the foam acts as the decoupling between the two backer boards.

Given the price of Wedi, would going back to (cheaper) Marmox board do the same job? The specification seem very similar (if anything the Marmox seems stronger).

ive never used marmx so cant comment but if there like wedi ie water proof then yes

 

[jmm]

ive never used marmx so cant comment but if there like wedi ie water proof then yes

Seems to be a similar spec but half the price. So finally...

- Beam and block
- Ardex DPM 1 C
- Ardex P4 primer
- Ardex x7G Plus adhesive (C2)
- 30mm (or 20mm + 10mm) Marmox board with fibre tape
- Ardex x7 Plus adhesive
- Tile

 

[bcd-87]

I have 4 pipes: 1x water, 2x waste and 1x capped gas. The two board solution is interesting. Ideally I want to lay the least amount of board possible (i.e. once at 40mm). But this will difficulties around the pipes.

DPM on the walls too instead of a plastic sheet then.

Removing the need for Ditra would save several hundred pounds. I guessing the foam acts as the decoupling between the two backer boards.

Given the price of Wedi, would going back to (cheaper) Marmox board do the same job? The specification seem very similar (if anything the Marmox seems stronger).

Are you the tiler of the home owner ?