Is it a good idea to install vinyl plank flooring (7mm thick, 7 inch wide) over new cement board / backer board? The cement board will be screwed to a 3/4" T&G plywood subfloor which is supported by 2x10 I-joist 12"o.c.
The reason of this bizarre application is that I have settled floor that needs to be raised up by 1/2". I know traditionally it's done by adding a layer of underlayment grade plywood or OSB. However cement boards just seem to be far superior in terms of price (at least right now) and easiness to handle since they are small and can be scored to cut. The work area is pretty small (bedroom of about 150 sqft).
I can't seem to find information of this type of application online. I also called APA and James Hardie and they can't answer me because this is not in their guideline.
Any thoughts or comments are appreciated!