Hello all,
I finally have some time to continue with the hearth for my Hearthstone Equinox. The granite is a custom, edge-laminated 80" x 51" 900 lb behemoth.
The pocket that will hold the insulating substrates is 1.23" deep (the thickness of the granite).
I had to marry together a combination of non-combustible, insulating materials that added up to a thickness of about 1". The 1/4" or so left over is for thinset. I need a final R value of 1.
Ended up with a layer of 3/8" Micor on the floor, a 12 gauge steel plate on top of that and a 1/2" piece of durock. I'll thinset the top of this stack with a 3/8" notch trowel then we will lower the granite on to it.
This will ensure an even and fully supported slab so when we sit the 680# stove on it, it won't crack from pressure points at the areas of the feet. It will also make up for any inconsistencies in the floor and granite.
The steel plate was added because I needed the stack to be about 1/8" taller. I figured putting it on top of the Micor will also help spread the load. The Micor is relatively soft.
I put the Micor down first as it will not damage the floor and will allow repositioning of the entire hearth assy after it's in place on the floor. I will need to slide the hearth back up against the wall. The laminated edges (about 3" wide") will be slightly above the floor, maintained by a layer of thin, hard posterboard that will be glued to the underside of the edges.
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I finally have some time to continue with the hearth for my Hearthstone Equinox. The granite is a custom, edge-laminated 80" x 51" 900 lb behemoth.
The pocket that will hold the insulating substrates is 1.23" deep (the thickness of the granite).
I had to marry together a combination of non-combustible, insulating materials that added up to a thickness of about 1". The 1/4" or so left over is for thinset. I need a final R value of 1.
Ended up with a layer of 3/8" Micor on the floor, a 12 gauge steel plate on top of that and a 1/2" piece of durock. I'll thinset the top of this stack with a 3/8" notch trowel then we will lower the granite on to it.
This will ensure an even and fully supported slab so when we sit the 680# stove on it, it won't crack from pressure points at the areas of the feet. It will also make up for any inconsistencies in the floor and granite.
The steel plate was added because I needed the stack to be about 1/8" taller. I figured putting it on top of the Micor will also help spread the load. The Micor is relatively soft.
I put the Micor down first as it will not damage the floor and will allow repositioning of the entire hearth assy after it's in place on the floor. I will need to slide the hearth back up against the wall. The laminated edges (about 3" wide") will be slightly above the floor, maintained by a layer of thin, hard posterboard that will be glued to the underside of the edges.
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