tiling over old parquet adhesive

[hbltd]

Hi all.
Have had a read through a few posts and there are some very knowledgeable people on here who I am hopefull will be able to help me.
Im doing up an old cottage. Ive just taken up a parquet floor which was stuck down with a bitumen adhesive. The screed is sound although damp seems to be present so I want to use a Ditra mat before tiling. Will tile adhesive stay stuck to the old bitumen adhesive ok. Many thanks in advance

[hillhead]

Is it stuck tight to the floor or easily scraped off in places? Is it covering the floor or patchy?the quality of flexi adhesives today sticks to most things no prob.

[whitebeam]

I'd want to know where the damp is coming from

[hbltd]

Thanks for your replies,

the old adhesive is very well stuck to the screed and does not scrape off easily.

I think the damp is due to a lack of DPM beneath slab.

[Dave]

A Vapour equalisation membrane will help that slab breath and the tiled installation stop intact..

[Ajax123]

Vapour Stabilisation a must on this one. SBR/cement slurry over the bitumen before you stick the decoupling mat down would probably help enormously.

[garythetiler]

any reason why the ditra cant be stuck down with bitumous adhesive ?

[Dave]

What ever it is stuck down with is seperate to what is already down..so the first coat/adhesive needs to be intact....slurry coat is the way i would go.....

[SnipSnap]

What ever it is stuck down with is seperate to what is already down..so the first coat/adhesive needs to be intact....slurry coat is the way i would go.....

Hi Dave,
Can you expand on this?
Thanks.