Good Water resistant thick bed floor adhesive - Tile Advice

Sam2494 · Sep 19, 2017

Hi,

Currently in the middle of renovating an old property, dug up old quarry's and self levelled! Still out by 10/15mm in spots so looking for a waterproof thick bed adhesive. Needs to be water resistant due to do DPM, have used ardex NA for Self levelling as moisture resistant.

Anyone have any recommendations?

Cheers

Rookery · Sep 20, 2017

All cement based tile adhesive is water-resistant not water proof. For thick bed I use BAL PTB or Weber Thick Bed, depending on where the job is.

Andy Allen · Sep 20, 2017

Just because an adhesive is water resistant it will not protect from rising damp. A suitable DPM should have been fitted first.

Sam2494 · Sep 20, 2017

Well after speaking direct with Ardex & Mapei both said that because we were tiling the subfloor a DPM is not necessarily needed, as long as moisture resistant self levelling is used! The floor will breathe through grout joints.

Sam2494 · Sep 20, 2017

Sorry I wasn't asking that the adhesive to be waterproof from damp or to create a waterproof barrier I meant the adhesive needs to be water resistant so t won't break down when in contact with the moisture, I know most adhesives out the bag are unaffected by water

Bond · Sep 20, 2017

Sam2494 said:
Well after speaking direct with Ardex & Mapei both said that because we were tiling the subfloor a DPM is not necessarily needed, as long as moisture resistant self levelling is used! The floor will breathe through grout joints.

It's a fundamental requirement in habitable buildings to have a suitable damp proof membrane to prevent moisture entering the building from the ground. Ground moisture may also contain mineral ground salts these can potentially cause adhesive failure. It's your call of course.

Andy Allen · Sep 20, 2017

This is why your floor was tiled with a quarry tile.... It's a natural tile with no glaze and allows the floor to breath.
What tiles were you thinking of putting down?

hmtiling · Sep 20, 2017

Bond said:
It's a fundamental requirement in habitable buildings to have a suitable damp proof membrane to prevent moisture entering the building from the ground. Ground moisture may also contain mineral ground salts these can potentially cause adhesive failure. It's your call of course.

Not the case with lime screeds

hmtiling · Sep 20, 2017

Tilemaster standard setaflex white is breathable as is tilemaster pro flow 2 part leveller.

Bond · Sep 20, 2017

hmtiling said:
Not the case with lime screeds

What's not the case in relation to lime screeds?

hmtiling · Sep 20, 2017

Bond said:
What's not the case in relation to lime screeds?

A lime screed will function without a dpm

Bond · Sep 20, 2017

hmtiling said:
A lime screed will function without a dpm

Okay cheers, have no knowledge of lime screeds.

Sam2494 · Sep 20, 2017

Yes I know the quarry's were there because they are a breathable covering, yes it is fundamental in new builds and builds over the last 50 years however I'm working on a 1940/30's property so no integral DPM under the floor slab, used slate for internal dpc of walls and 2 course of blues for external!

We are laying porcelain tiles throughout (yes I know they aren't breathable) however after speaking with Ardex & Mapei technical departments both said exactly the same, no need to use a DPM, only real need for DPM is with timber & vinyl floors. Even with us laying porcelain floor will breathe through grout joints & eventually moisture will make its way through. Cement based adhesives will not be effected by damp they both told me along with Ardex NA self levelling. Natural salts in the ground may cause some essofflerecent coming through grout however chance of this is unlikely.

Andy Allen · Sep 20, 2017

We need @Ajax123 on this..... He's the screed expert..

Bond · Sep 20, 2017

Sam2494 said:
Yes I know the quarry's were there because they are a breathable covering, yes it is fundamental in new builds and builds over the last 50 years however I'm working on a 1940/30's property so no integral DPM under the floor slab, used slate for internal dpc of walls and 2 course of blues for external!

We are laying porcelain tiles throughout (yes I know they aren't breathable) however after speaking with Ardex & Mapei technical departments both said exactly the same, no need to use a DPM, only real need for DPM is with timber & vinyl floors. Even with us laying porcelain floor will breathe through grout joints & eventually moisture will make its way through. Cement based adhesives will not be effected by damp they both told me along with Ardex NA self levelling. Natural salts in the ground may cause some essofflerecent coming through grout however chance of this is unlikely.

Crystallasion of salts often causes swelling and forces thus generated can cause adhesive failure. ( especially with a relatively impervious tile) . Unlikely l know, nevertheless possible.

Good Water resistant thick bed floor adhesive - Tile Advice

Sam2494

Rookery

Andy Allen

TF

Sam2494

Sam2494

Bond

TF

Andy Allen

TF

hmtiling

hmtiling

Bond

TF

hmtiling

Bond

TF

Sam2494

Andy Allen

TF

Bond

TF

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