I may be overthinking this, but have to ask. Couldn't find the answer on USG's website.
I'm installing a hearth in my log home for a wood stove. Behind the stove will be an air space, a layer of 1/2" Durock, then 2-inch thick manufactured stovne veneer. My question is about the Durock. It is Class A fire rated, but it isn't fire I'm concerned about. Durock has some sort of mesh material in it. I don't know what it's made of, but it cuts easily with a utility knife. Will this material melt from the constant heat where the the masonry thimble passes through the Durock, and somehow compromise the installation? Do I need to hold the rock away from the thimble some distance? Any advice would be appreciated. Thanks.