PermaBase Cement Board has superior moisture resistance to fiber cement products.
It is my experience that subfloor should be oriented strand board (OSB). Cement board can go on top. For floor, use 1/4” cement board - you’ll find that in the flooring section of the store. Difference in elevation between bathroom and hallway or bedroom can be handled with transition thresholds. Hope this helps.
I find that tolerances are loose in general with building products. You’ll be using thin-set on top of this so that 0.08” can be easily gapped.
The R-value of 1/2" PermaBase is .37.
Who’s right? I tend to go with manufacturer that has tested. Explain if you say “.no”
Recommend full demo if surface cannot be made even when applying new thin set mortar for the re- tiling.
Once the tile is removed, use latex modified portland cement mortar to repair the board. Apply a layer of mortar over the damaged area, press between the fibers of the mesh and trowel flat to glue the board back together.
No. It’s is made in large part with cement, and it is permeable, (water can go through it. If you are using it behind tile in a shower for example, I recommend using 2 good coats of a product call Redguard after installing the cement board and taping and mudding the joints with thin set. You roll it onto the surface with a coarse paint roller. That will make it waterproof, as long as you take care to cover the surface completely with 2 good coats of the Redguard. You can also buy the Redguard at Home Depot. It’s expensive, but it really works well, and is easy to apply. Just make sure you do a good job!
I use the rough for mechanical adhesive grab. Smooth when painting or under porch animal blocking.
No. Home Depot only has Permabase in 1/2” thickness. But they do have other products in 1/4” thickness.