Mounting HardieBacker Around Fireplace
I am working to attach HardieBacker (non-combustible, right?) to a CMU wall that surrounds around our fireplace insert. The rest of the wall has drywall installed over 1x wood sleepers that are glued to the CMU. I want to install the HB on the same plane as the drywall and then mud, tape, and texture the whole wall so the HB portion is indistinguishable from the drywall portion.
I’ve cut some HB “strips” to create a non-combustible build up behind the HB panel, and now am faced with making it all stay in place against the wall. Screws? Okay, I can get those (but I don’t have a hammer drill to make the holes). Adhesive? Power Grab says no go on cement board. What would any of you recommend?