Plywood or Hardiebacker or NoMorePly

[John Benton]

Apparently nmp comes preprimed now and is slippy as hell, one of a few reasons I moved to Hardie

 

[Walshy]

Is it always nesessary to put the 6mm boards down with both adhesive and screws? I always thought it was but the guy in my local tile shop swears you can just screw them down If the underlying floor is good?

 

[Bathfix Bob]

3mm perimeter yes.

Is it always nesessary to put the 6mm boards down with both adhesive and screws? I always thought it was but the guy in my local tile shop swears you can just screw them down If the underlying floor is good?

I was ridiculed once by an employed very quick but rough tiler for using adhesive under them, he left fully thinking he was right.

Adhesive every time for me, it won't get my home at 4:00pm like him though.

 

[GoneGuy]

Hardiebacker for me, prime then use a flexible adhesive with 6mm notch trowel then put boards down staggered and use 12 screws per board and use the tape for joints and smooth off with adhesive.
@HardieBacker can help you if you need any technical help

 

[Colo]

Thanks for all the excellent advice lads.

This might seem like a daft question but do I put the cement board straight on top of existing floor and does this take the place of ply.

Sorry for the ignorance

ATB

Col

 

[Bathfix Bob]

Yes but screw the floor firmly down, 4x50mm screws in the joists not through pipes or cables.

 

[Colo]

Thank you Bob,

I appreciate your help, as you can see I need all the help I can get after being let down by fitter.

ATB

Col

 

[Colo]

Hello Lads,

I would appreciate your professional advice.

It has been suggested that I use ply and put Ditra on top.

I have tested the floor with a lazer level and there does not appear to be any deflection. I found some info in old posts about L360 code and have worked the maximun deflection to be around L500 and the allowed deflection is L360 so all looks good.

Do you think ply and Ditra is over the top as there is little deflection and should I stick with Hardi or No More Ply.

Any help is appreciated

ATB

Col

 

[On one]

Hardiebacker.....all the way
And anyway Ditra would only help with lateral movement.

 

[Colo]

Thank you for replying I do appreciate it.

Col