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Backer board over cement floor?

I need to raise a bathroom floor about 3/4 inch. I have already poured a thin layer of self leveling concrete over what appeared to be some sort of concrete floor that had some uneven areas (60 year old house). I have read about how you are not supposed to put backer board on concrete because you can't secure it. My question is this: could you lay the backer board on top of the SLC, leave some small gaps between the boards, and then pour another layer of SLC on top of the backer board, thereby cementing it into place??


I d rather see you pore a SLC to the depth you need it.. Some compounds you can pore to the depth of 1 in 1 pore and some you need to do in 2 pores. Now if you need to do a full 3/4 depth you can do a tile mud bed , but this is a little challenging for a 1 st time. If you have some good DIY skills then you can probably do it. Just going over slab requires a few different steps when doing a mud bed over slab. Any questions you can e mail me through my avatar and check my qualifications there. GL
May 11, 2017
I'm a tiler and a Hardwood installer. Backer board is specifically used for tile. The board is designed to created a strong and rigid bond to the subfloor. There's always movement in a structure and if you skip backerboard then your tile moves with the natural flexing of the house causing cracking in the tile and grout. Viny is flexible so all you need to do is to remove existing flooring and lay right on the subfloor.
May 11, 2017

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