I'm gonna insulate the rear wall of my fireplace (chimney on exterior wall) with a layer of Roxul, then cover it with a piece of durock. It's vertical for about the first foot, then slopes inward towards the top. Question is what is the best way to go about fastening or supporting this to the rear wall? Thanks
Quick Question - Supporting Roxul/Durock?
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If you tapcon or masonry anchor and then screw it will compress the roxul which will reduce its insulative value. It's more work, but if you cut 3" sections of 1/2" metal pipe (copper or EMT conduit) you can use them as spacers with long decking screws.
Yes, steel drywall studs work fine. I used them when I built my stone wall behind the stove. There are at least 3 different depths available and they are very easy to work with. I don't see any problems with begreen's suggestion, except that the weight wil be carried by the floor where the durock sits since long screws with spacers won't hold much vertical weight.. With steel studs, the wall will hold most of the weight and the floor will hold some. You can also allow for an air gap if you want and I would use metal lathe to keep the roxul from filling the entire space.
Good point. I was thinking of the firebox floor supporting all the weight and the screws with spacers just holding the sheet in place . It wouldn't take more than 3-4 screws to do the job. Use flat washers on the screw heads to stop them from pulling through.
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