Dry screed over ufh and slc

[stusgsx]

Going to a job tomorrow where the floor is out of level by about 30mm over 2 metres. Ufh and self levelling (which hasnt levelled anything) have already been laid. Can I dry screed over the top? I know thus will slow heat up time but the customer just wants it sorted

 

[Ajax123]

Yes you can but you could end up with a heck of a depth. You would need to prep the existing and then lay a minimum of 50mm screed reinforced with fibres or d49 mesh. An alternative would be a thinner gypsol screed (minimum 30mm). There are various other options as well but it all depends on depth. A thick bed levelling compound like Arden a35 is another option if drying times are a problem. Whichever you go for you would need to make sure the substrate is prepped properly.

 

[stusgsx]

So a normal sand and cement is out of the question then?

 

[Ajax123]

So a normal sand and cement is out of the question then?

Not out of the question just depends on the depth you have available. Why not just use a levelling compound to take out the 30mm fall??

 

[White Room]

Self leveling for me and usually some can take 3-4 hours to set....

 

[stusgsx]

It would take a hell of a lot of self levelling to get this floor right its horrendous. Was going to screed the worst of it then self level. Doesn't matter on drying times on this occasion as I have a couple of months to get this finished

 

[White Room]

So the floor is just 2m2 out and 30mm deep .....

 

[stusgsx]

No room is roughly 2m long it's 4-5sqm. The only correct level is near the door so the whole lot needs to come up to the right height

 

[White Room]

What I'm trying to say is you have 30mm at the deep end but what does it feather out to.....

 

[stusgsx]

Ah ok. Will have to feather out to nothing

 

[stusgsx]

Well....I started taking up the old tiles and it pulled up the floor with it including slc , ufh and screed which had turned to dust!

 

[Ajax123]

Well....I started taking up the old tiles and it pulled up the floor with it including slc , ufh and screed which had turned to dust!

Oops. I guess that decision is made then