Leveling for floating floor

[i_am_fubar]

It's the old problem. Bitumen (not DPC, just adhesive) residue left from asbestos-vinyl floor tile removal. Bitumen is dry, but stable.

Need to level it.

I've put some experimental blobs of cement based leveller down in a couple of spots to test adhesion, and they seem to be stuck well. But I've read levelling compounds don't stick.

Now, is this only really an issue if you glue/adhere to the leveller (tiles, glue down wood...etc)? and put vertical tensile forces into it? I can't imagine it will do anything if you float a floor over it as there are no vertical tensile loads, and only fractional loads. Even if the levelling compound delaminates from the bitumen completely, it will still act as a shaped packer.

What exactly is the failure response of levelling compound over bitumen compounds?

Cheers,
Fubar.

 

[dazlight]

You can use Ardex NA smoothing compound on it

http://www.ardex.co.uk/Store/tabid/96/ProdID/18/Default.aspx

 

[crazydaze]

Primer and then screed should be ok provided moisture is ok.

 

[i_am_fubar]

So, hypotrhetically... If I'd already dropped a bucket of water based leveling compound onto bitumen... what would happen? >.>

Fubar.

 

[dazlight]

It could blow of the floor. Pas your not gluing on it you might get away with it though.