what are the ways to level up concrete floor when they are at least 10mm lower?

[AustinTiler]

Hi, I have a 11 s.q.m. job where there are 80% are 10mm lower than other place; I have been suggested by a builder to put down 9mm cement board with proper spread of floor glue; which is a lot more cheaper, stabler and stronger than slc; should I have any other options? answers are much appreciated~~~~:hurray::hurray::hurray:

 

[Gazzer]

Prime the floor and use a good SLC. No problems .

 

[Stewart]

Usa a quality slc after priming floor....it's how I do it. If more than 20 mm, I use marmox boards, then slc over the top.

 

[White Room]

I would use slc on 10mm.

 

[Ian]

SLC for me. There are a few on the market now that are able to cope with being laid up to 50mm in one hit.

 

[Ajax123]

I used both on mine. Self Levelling to bring it part way up then 9mm Hardibacker screwed down at 150mm centres to give me something I trusted to tile onto. My SLC was ay risk cos the sub floor was powdery and unstable. I tiled it several months ago now and it all seems fine. However the fact that the hardi is not stuck down means it does all sound a bit hollow.

 

[grumpygrouter]

I used both on mine. Self Levelling to bring it part way up then 9mm Hardibacker screwed down at 150mm centres to give me something I trusted to tile onto. My SLC was ay risk cos the sub floor was powdery and unstable. I tiled it several months ago now and it all seems fine. However the fact that the hardi is not stuck down means it does all sound a bit hollow.

The adhesive underneath hardie is just to fill the voids, not stick it down as such. Thats why it sounds hollow, because it is........... :yikes:

 

[AustinTiler]

thanks so much guys; we have decided to do it with SLC; great answers, great help!!