Front path slab ( possibly has rising damp) - can I tile on it?

[Mark C]

I hope you guys can help me.
IN my own home, I have screeded in a front path slab because the old one was a bit cracked. My new slab isabout 150 mm of hard core and 100 mm of sharp sand and cement. Stupidly I didnt include a plastic membrane. An area of the path seems to be not as dry as the rest - I dont know if it thats rain or rising damp but suspect its rising.

For the job I have some durabase cl++ mesh, mapei keraquick S1 adhesive. ( I dont have to use the mesh if it creates more problems)
The tiles are porcelain 6x6 with a 12 inch border tile on a backing mesh black and white.

I would be interested in advice as to how to proceed please. Ideally Id like to bond the mesh to the slightly damp screed, or tile directly onto that screed. If there is a solution to apply a dmp and tile on it that would be great, or maybe the adhesive will simply bond with a level of dampness with an appropriate primer.

Or, do I have to bite the bullet and break up the slab and re-lay it with a membrane.

Your sage advice is much appreciated. This forum is a life saver!

Thanks

 

[Dave]

It’s on slope so water within the base will seep to that section. Leave till its warmer and dry weather and tile straight onto it. No membrane required.

 

[Mark C]

Thanks David. I appreciate you taking the time to reply.
Warm and dry weather ? Id better pack those tiles away for a few months then!

 

[Dave]

Thanks David. I appreciate you taking the time to reply.
Warm and dry weather ? Id better pack those tiles away for a few months then!

Too cold to tile outside mate. Adhesive won’t set under 5dgs and has to be no frosts at night. Also adhesive/grout needs to gain full structural strength before being exposed to freeze/thaw.