Help!: Concrete floor prep help needed

[RobM]

Hi. Have 1840s property where I have knocked two rooms into one to form large kitchen/diner. Want to tile the kitchen floor area and apply wooden floor to the diner area. Existing kitchen area used to have some form of bonded vinyl tiles which now removed have left a bitumen type surface.
Existing diner area is original concrete/screed but is in poor condition in places. I'm assuming due to age of property there is no DPC under floor (although no signs of dampness in floor) but would like to use a self levelling product that will also act as a damproof membrane just to make sure. I also need something that can be used on both floor areas that would be suitable for the applicatrion of both tiles and wood flooring.
I've searched the net and can't find an all in one product Most require area to be free of 'oils' so does this mean I need to somehow remove the bitumen surface left from the old tiles first ? Could I seal the whole area with a bitumen type sealer and blind it with sand then use a resin / cement based self levelling compound? Any views on best products for this?
Any help appreciated, only want to do the job once!

Thanks.

[PACO]

hi there , BAL supercover rapid flexi .that would be my choice .

[jay]

would be best to remove the old adh

and by poor condition of concrete floor what exactly do you mean cracks powdery or just not flat

[diamondtiling]

Hi. Have 1840s property where I have knocked two rooms into one to form large kitchen/diner. Want to tile the kitchen floor area and apply wooden floor to the diner area. Existing kitchen area used to have some form of bonded vinyl tiles which now removed have left a bitumen type surface.
Existing diner area is original concrete/screed but is in poor condition in places. I'm assuming due to age of property there is no DPC under floor (although no signs of dampness in floor) but would like to use a self levelling product that will also act as a damproof membrane just to make sure. I also need something that can be used on both floor areas that would be suitable for the applicatrion of both tiles and wood flooring.
I've searched the net and can't find an all in one product Most require area to be free of 'oils' so does this mean I need to somehow remove the bitumen surface left from the old tiles first ? Could I seal the whole area with a bitumen type sealer and blind it with sand then use a resin / cement based self levelling compound? Any views on best products for this?
Any help appreciated, only want to do the job once!

Thanks.

Send a pm to Alan, he will know for sure.



TilersForums.co.uk | Tile Forums | Tiling Forum - View Profile: Ajax123

[merlecollins]

I've done this before on a supermarket floor

Mapei do a product that you roller on the concrete before tiling or self levelling and it acts as a DPM - I can't remember the name of it, but it was SUPER sticky

I'll look into it and get back to you

[merlecollins]

OK.

I 'think' it was this primer that was recommended by Mapei and what we used:

http://www.mapei.it/Referenze/Multim...er%20ep_gb.pdf

It was a very old concrete slab (approx 350m2) that we uplifted the vinyl tiles, scarified the surface to remove the vinyl adhesive then applied this product before tiling. The concrete did show evidence of dampness before we used this - but basically this product seals it in, so it cannot have a detrimental effect to the tiled floor.

[Ajax123]

Tremco Universal one coat DPM followed by Tremco Unismooth levelling compound

Uzin used to do a smoothing compound which was also a DPM but I can't find it on the net at the moment. You could give them a ring on Monday. I am sure they still have it available. Their technical manager is a guy called Stewart Plant.

[garythetiler]

learning from previous posts on this subject there is a school of thought that with the older constructed buildings they actually need to be allowed to breath and by placing a dpm on the floor you will actually increase the amount of moisture rising up into the walls, creating a dpm on the floor may not be the best answer unless suitable damp proofing is also included into the superstructure of the building,I would very much be thinking of a breathable tiling solution utilising natural materials such as limestone or terracotta which were in keeping with the fabric of the original build rather than using a modern solution that may not be compatible to the original building hope this helps Gary

[mikethetile]

a very valid point gary

saved me trying to explain it

[Dave]

5 coats of neat PVA will sort it..

[RobM]

would be best to remove the old adh

and by poor condition of concrete floor what exactly do you mean cracks powdery or just not flat

Hi Jay. It's actually a bit of both!