Cracked screed floor.

[costachubb]

Have a problem, floor screed is crumbling and there is a crack right in the middle of the floor. There's also old carpet adhesive along the perimeter of the room(hall). I want to tile over. Any advice as to how to go about it, please.

 

[White Room]

Any pictures available....

 

[DHTiling]

Can you elaborate on crumbling..?

 

[costachubb]

When I tried to scrape the carpet adhesive off the screed it comes off not very easily btw also the adhesives comes off with the layer of the screed, which looks more like compressed sand

 

[Ian]

Looks like an old layer of levelling compound.

 

[White Room]

Could also be a weak/sandy floor screed...

 

[costachubb]

My mate suggested that should just tile over it... I decided to scrape the carpet adhesive off as much as pos before tiling. Would I need to use slc? Would it bond to this sandy screed?...

 

[Ajax123]

Run a sander over it to get rid of all the rubbish on the top. Vac it. That might give you a fighting chance to see what state it's in. The crack is a simple shrinkage restraint crack. There should have been a joint across the doorway but that has been missed leading to the crack. If the screed is heated it will need an epoxy stitch repair. If its unheated you could either epoxy it or ditra over the top.

 

[White Room]

I would stabalize the screed with sbr to give you a fighting chance....

 

[2020Tiling]

would you have to ditra over the whole floor or could you get away with a long piece over the crack then use a fibre slc and self level over the whole floor? I have a similar problem at the min.

 

[Ajax123]

Whole floor. Ditra is not for crack "bridging" but is to take account of horizontal stresses which cause cracks in the first place. A length just over the crack is likely to move the problem elsewhere.