tiling onto bitumen adhesive?

[iaith]

I removed some lino tiles and underneath is some black bitumen type adhesive. is this ok to tile onto or should I remove it?
Thanks.

 

[GazBAL]

I removed some lino tiles and underneath is some black bitumen type adhesive. is this ok to tile onto or should I remove it?
Thanks.

Ideally it should be totally removed , heed not to use any solvents to remove it as they may then react with the tile adhesive and cause failure.

Gaz

 

[Richard C]

It’s not recommended to tile over bitumen adhesive but the problem is that the stuff is almost impossible to remove by mechanical means (it just goes soft) & solvents are not practical for health reasons & risk a possible reaction with the adhesive.

Best advice I can give is to remove the thicker/uneven/loose bits, make sure it’s clean & no grease, prime with an decent SBR based bonding primer & tile using a flexible cement powder adhesive (Rapidset Flexible). Neither I nor the adhesive manufacturer will guarantee it but I’ve tiled onto a couple of old kitchen floors without any comebacks. Some recommend priming with Ardex P82 primer but I’ve never tried it; only bullet proof approach would be to put down a self leveling screed & then tile over that.

 

[tictic]

scrape as much as you can off.
then put a slurry coat over it..(portland cement and sbr)

ratio..2part cement:1 part sbr.

 

[iaith]

Thanke for the replies fellas. The floor was pretty uneven so in the end I got most of it up with a sds hammer then put down self leveller.
I often use sbr slurry mix when plastering , handy to know it can be used with tiling too. Cheers

 

[tictic]

... your more than welcome.....

 

[markhi123]

Can I ask iaith what slc you used?? Thanks