Help!: Contaminated with bitumen

[yoyotony]

I am about to tile a large kitchen floor which use to have a paraquet wod floor. The timber as been removed but the bitument is left behind.

Is there any recoomendation on what to use and do regrding adhesive, primer etc, I am also laying underfloor heating *(mat type) incase this makes it any diffrent.

Any suggestions would be much appreciated.

Cheers

Tony

[grumpygrouter]

If the bitumen is reasonably flat and firmly fixed, you can skim over with Ardex Feather Finish and leave to dry. Once dry, tile away!

What is the sub floor as a matter of interest?

[yoyotony]

Hi thanx for your advice, The sub base is concreete. Is what you mentioned ok if I am going to put electric underfloor heating mat in the floor?

[grumpygrouter]

It will be fine. You need to lay insulating boards underneath your heating mats first, I assume you were going to do that anyway?

[yoyotony]

I was thinking about it but not sure!

So I still need to coat with ardex. then lay the boards, then lay electric mat and then tile?

Never layed electric heating before and firstime I have come accross the bitumen.

Cheers

Tony

[grumpygrouter]

If you don't lay the insulating boards, you will spend most of your money heating the screed slab beneath your heat mats, and not the tile.

Yes, do the ardex bit first and then lay your boards using flexy tile adhesive, then fit the mat, skim with SLC. When the slc has dried, then tile on top.

[CJ]

AS ABOVE

[Dave]

You could also just apply a slurry coat before fixing the insulation boards.....this will give the adhesive a superior grip...

[yoyotony]

sorry to sound daft but what is SLC.

And thank you for all your advice so far!

[grumpygrouter]

sorry to sound daft but what is SLC.

And thank you for all your advice so far!

Self Levelling Compound

[yoyotony]

Slc oh yeah what a prat! DO I need to prime the bitumen before the ardex coat?

Dave when you say a slurey coat is this of the ardex? leaving it wet before the boards.

When you mention the slc over the electric mat cant you just tile over it?

Cheers

Tony

[yoyotony]

Can I not just pirime the buitumen with SBR then stick the boards down with tile adhesive? Why do I need the ardex it just so I understand the the technical side, I find understanding that nake the job far easier!

[yoyotony]

Hi am having a nightmare with the boards are the hardi backer boards OK cement based or do they need to be foam type?

[aardvaarktiling]

hardibacker boards won't insulate the floor, you need to use wedi, marmox, pcs insulation boards

[grumpygrouter]

Slc oh yeah what a prat! DO I need to prime the bitumen before the ardex coat?

Dave when you say a slurey coat is this of the ardex? leaving it wet before the boards.

When you mention the slc over the electric mat cant you just tile over it?

Cheers

Tony

No Tony, the Ardex covers and adheres to the bitumen residue (or other thin adhesive residues come to that) and is then ready for tiling as a finished surface if need be. No further priming is necessary.

You can just tile over the heat mat but it is much easier to tile over a smooth flat surface that a levelling compound would give you. Also if you have to remove a tile at some time in the future, you have some protection against damaging your heat mat.

[yoyotony]

Thanks for that some of these tile shops send you in the wrong direction I thought using a cement based boared defeted the object!

What I ment was can I prime the bitumen then laythe boards over that without the ardex as long as I prime the Bitumen surface first?

What should I be paying for these insulation sheets?

Cheers Toony

[grumpygrouter]

Thanks for that some of these tile shops send you in the wrong direction I thought using a cement based boared defeted the object!

What I ment was can I prime the bitumen then laythe boards over that without the ardex as long as I prime the Bitumen surface first?

What should I be paying for these insulation sheets?

Cheers Toony

You can prime the bitumen but you need an epoxy primer such as Ardex P82. It can take several hours to dry though. Ardex Feather Finish gives the same end result but with a quicker turn around time.