bitumen residue on floor screed

[alterego]

I've taken up some old thermoplastic floor tiles laid in the early 70's. This has left a black bitumenous residue on the concrete screed and I'm concerned about tiling onto it. I want to lay travertine stone tiles so should I seal the old surface first or apply adhesive directly? What products would you recommend?

 

[GazTech]

Good neat coat of BAL bond,and use white flexible adhesive,this will stop any possible bleedthrough to discolour marble, you can't go wrong.

 

[tony TLC]

im with gaz on that done it many times but i aways get the punter to lift the the old crap😉

 

[alterego]

Thanks guys, was worried about getting good adhesion more than bleed through but I assume you think it's not going to be a problem if I use Bal Bond. Do I use it neat or diluted?

 

[GazTech]

Good neat coat of BAL bond,and use white flexible adhesive,this will stop any possible bleedthrough to discolour marble, you can't go wrong.

Good neat coat

 

[alterego]

cheers Gaz