Tiling a concrete floor in a room that used to be outside

[Susiequ]

I have been asked to tile a concrete floor (not seen yet) that was an outside floor but has been incorporated into a house. It lets damp through. What prep is needed?

 

[Dumbo]

Damp is an issue that can be solved with liquid dpm . Some adhesive manufacturers do them but what about insulation . Has this extension got any building control on it as I'm sure it should have some insulation in the floor slab to pass . Probably something like 75mm celotex.

 

[Susiequ]

I have no more info so far. I'm hoping to go see it later today and will get back to you then. Is dpm easy to apply?

 

[Dumbo]

I have no more info so far. I'm hoping to go see it later today and will get back to you then. Is dpm easy to apply?

I've never done it . But should be pretty straightforward look up products on websites of adhesive manufacturers firstly .

 

[Italy]

If I understand it well. moisture rising from the ground ??.
Mapei, mapelastic foundation.
First, specific primer.
The cement must be dry before application.

 

[Spacey]

The only only manufacturer I know of that says you can use there product on concrete with no mechanical dpm under the slab is Ardex 1C but that is dependent on where the property is on the water table as hydrostatic pressure can potentially blow the dpm and anything on top of it off the slab if its low enough on the table.

 

[Unused Account 1]

You can get addy for this

 

[Old Mod]

Just make sure you apply the liquid dpm to the correct thickness or it will be ineffective.
If you get more coverage than it says, it's too thin.

The only only manufacturer I know of that says you can use there product on concrete with no mechanical dpm under the slab is Ardex 1C

Or this

Tilemaster liquid DPM

 

[Unused Account 1]

Nice one 3 fall

 

[Spacey]

Just make sure you apply the liquid dpm to the correct thickness or it will be ineffective.
If you get more coverage than it says, it's too thin.




Or this

Tilemaster liquid DPM

Haven't seen this before but I do use superflow30 I'll look into it

Most epoxy liquid dpms are applied with an A2 notch fan trowel and then rolled with a fine roller.
This thickness is measure in microns
It shouldn't be laid to thick either

 

[Old Mod]

Or this from one of our sponsors.

@ISOMAT UK
Isomat liquid DPM

 

[Spacey]

Or this from one of our sponsors.

@ISOMAT UK
Isomat liquid DPM

So these can be used with no mechanical dpm ?

 

[Spacey]

So these can be used with no mechanical dpm ?

Doesn't state it on the odd

This is a simlar product to Uzin 414 also hardens concrete

I'd still only use Ardex epoxy on this

 

[Dumbo]

Doesn't state it on the odd

This is a simlar product to Uzin 414 also hardens concrete

I'd still only use Ardex epoxy on this

There are a few liquid dpm's that can resist hydrostatic pressure .

 

[Spacey]

There are a few liquid dpm's that can resist hydrostatic pressure .

Only to a point None can fully really its always a risk

 

[Old Mod]

So these can be used with no mechanical dpm ?

Ok sorry just been speaking with Marek who's technical support with @ISOMAT UK
A better product for this install is their
Duroprimer-SG which can be used direct to concrete substrates, and is suitable for both ceramic and vinyl coverings.

Duroprimer-SG

 

[Susiequ]

Thank you all for your responses. I have now been to see this floor. It is basically a nice level slab. It has carpet tiles over it at the moment which the customer wants to be replaced with tiles. The carpet tiles are slightly damp underneath. I think the concrete will dry out when they are removed. No damp course under the slab but in no way could you consider it to be 'wet'. What do you think if I used a swimming pool type addy and grout?

 

[WetSaw]

It will need a damp course if it's going to be used as a room. If it's going to be a swimming pool crack on with your idea.

 

[Susiequ]

Its just being used to store stuff

 

[Spacey]

That'll do

Will never do

 

[WetSaw]

Damp will still be a problem if you don't stop it. Waterproof adhesive doesn't break down in water, it doesn't mean it won't necessarily let water through. Anything you store in that room is likely to be affected by damp and humidity.

 

[Italy]

Do not you understand what I said ?.
replay
Mapei mapelastic foundation is the solution.
then do as you like.

 

[Italy]

http://www.mapei.com/public/COM/products/2069_mapelasticfoundation_gb.pdf

 

[Italy]

I used it in this work.