cracked tiles over interior ashphalt floor

[mscg]

I have been called to a job - ensuite ground floor shower wet room. The existing floor tiles have developed hairline cracks. Having removed the tiles (300x300) it appears they were laid on a levelling compound which failed to bond to the ashphalt below. The ashphalt surface exposed is clean, smooth and shiny so I need to achieve a good bond. Can anyone offer advice please as to whether I should bond and would a spf be ok. Im going to lay travertine mosaic so possibly benfer? Shower area is 'wet area' so tiles will fall to drain already concreted in. Any advice gratefullly received

[whitebeam]

I'd be priming the ashphalt with sbr then using a spf with a decoupling membrane, just make sure the ashphalt is adhered to the base which it sits on

[Dave]

Epoxy primer or slurry coat...Or a latex leveller.

[mscg]

thanks whitebeam - can you explain what you mean about a decoupling membrane?

[whitebeam]

Dave above put a superb post about decoupling membranes, ditra and durabase do the same thing http://www.tilersforums.co.uk/tiling...ing-shift.html