Tiling on bitumen?

[Monkfish]

I've got an uneven concrete floor covered in a thin layer of bitumen (that stuck down the old floor tiles). The bitumen cannot be chipped or ground off (I've tried). I'm going to use self-leveling concrete and then tile on top, but should I coat the bitumen with something before I pour the concrete? Any advice would be appreciated.

 

[ColJack]

it CAN be chipped off or ground off, it just takes ages and wears out abour 3 dozen sanding / grinding disks.. and takes off a layer of concrete with it..

I just tiled straight over mine..
it's ok so far..

 

[tictic]

u could just put a slurry coat over it..
cement mixed with bal sbr that would do the trick for u.

 

[bathstyle]

I tend to get my blowtorch onto bitumin, then scrape it.

Welcome aboard tictic

 

[joe-90]

Remember that if you are tiling a floor the tiles can't go down or sideways - so you can get away with all sorts of stuff you'd never get away with on a wall.

 

[tictic]

I tend to get my blowtorch onto bitumin, then scrape it.

Welcome aboard tictic

cheers mate

and i"m not stalking u mate ....well yet..

 

[Monkfish]

Thanks for all the advice. I'm working in a small enclosed space so I don't want to kick up too much dust. I bought a wire brush attachment for my grinder but that just polishes the bitumen to a smooth glassy finish. I heard that petrol dissolves it, but that's too risky in a closed space. A blow torch is also a bit risky. The bitumen has excellent adhesion to the concrete floor, it's just the adhesion between the levelling cement I'm pouring on top and the bitumen I'm worried about. I was just wondering if there was some Unibond coating I could use.

 

[tictic]

slurry coat,over it mate.

 

[Monkfish]

I don't quite see why the slurry would adhere any better than the self-leveling concrete?

 

[tictic]

just putting other option ur way mate..slurry coat is what i would use thats all ,the adeshion is imo far superior to latex in this senario with the covering u have at the mo.. tho might be proven wrong but as they say "everday is a school day"