Sandy screed

[papillon]

Hi

I have been asked to tile an 11m2 exterior balcony with porcelain tiles and the screed is very sandy. I cannot draw a line across the surface with a pencil because the pencil just goes in to the surface. I tried to sweep the surface and a lot of sand came off.
Is it possible to use a certain adhesive or/and acrylic primer or should I run a mile?

 

[White Room]

Hi and welcome.....I would be cautious, try putting an old screwdriver into it and see how far it penetrates.

 

[Houston]

Did they forget to add cement? Run Forrest run

 

[cam_low]

i wouldnt touch it with a big pole thing