tiling bathroom floor with unstable/loose screed floor

[keith1960]

Hi everyone, im after some advice please, i am a bathroom installer, today i remove the original floor tile adhesive, ready to tile the floor with 450 x 450 porcelain tiles. the existing floor screed is extremely soft and has broken up in a few area, to a depth of about 20mm in places.How can i prepare the floor for tiling, i originally was going to latex the floor on friday and tile on saturday, so looking for a quick resolution to the problem, thought about detra matting to stabilise floor, any help appreciated please

 

[White Room]

If the screed is loose and friable then that will need to be sorted first.....

 

[keith1960]

thought about using granulated latex to fill the holes, but wasnt sure how long it would take to dry enough to put the detra down and then detra on top?

 

[Daz]

I usually patch "holes" with Ardex A45 fast setting cement but, as per Whitebeam, all loose matter needs to be removed first.

 

[keith1960]

thanks Daz, i thought of trying to fill the deep bits with latex with sharp sand to bulk it up, then quick drying latex screed, the tile with one part flexible slow set