- Sep 15, 2017
I'm doing a hearth in front of a manufactured fireplace. I'm following manufacturer's ancient instructions (although it sounds like they are overkill). Planning on putting down 1/2" of micore 300, and then 1/4" of durock with 1 5/8" Durock screws to hold the whole thing down to the subfloor. This will get a layer of thinset and 3/8" tiles.
- Will 1/4" durock be fine? I've seen 1/2" recommended elsewhere, but I'm trying to keep tile as low as possible? Original hearth was simply tiles glued to millboard and almost all tiles survived 30+ years.
- Durock (and other backerboard) instruction lists need for a layer of thinset below. I've not used micore before, but this doesn't seem necessary in this instance. Should I use thinset, or will a ton of Durock screws be fine?
- Is Flexbond an ok mortar to use for a hearth application, or should I try to use unmodified thinset?