Installing Hardiebacker on concrete slab?
We are redoing a small 5′ x 8′ guest bath. The tub was removed and the new pan was poured for a curbless shower. But because the rest of the concrete slab was not at the proper level to match the height of the new tile throughout the house, the licensed tile contractor installed Hardiebacker cement board (with thinset) to raise the slab in prep for tiling.
I thought that cement board directly on a slab is not the proper way to raise the slab? The contractor has assured me he has been doing it this way for years and guarantees his work.
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