I have a metal zero clearance fireplace, surrounded by drywall. I had
granite cut to cover the metal and about three inches over the drywall
(all the metal will be covered except for the lower vent). What
technique and adhesive should I use? Modified thinset, silicone
adhesive, etc? The metal does get somewhat hot if I have a good fire
going, so I wonder about thermal expansion differences. This is a
vertical installation, so the granite should be as flat to the metal
as possible; a substrate like a metal grid under the granite would
look terrible. I'm hoping to find the right adhesive that will allow
me to simply put the granite right up against the metal. The granite
pieces are heavy. Also, how much does granite expand when
warm...should I leave a small gap between the pieces? Hope to hear
answers from people that have actually done this type of installation
and used their fireplaces successfully!
I'm doing the same sort of install, and talked to a pro who suggested:
cover the metal with thin backer board & attach with thinset.
He said the metal would move around way too much to attach it
He also said "it is no great trick to get them to stick, the trick is
getting them to stick for 20 years."
I'm going to use sheet metal screws. There shouldn't be a problem with
that causing leaks or anything, not with backerboard, thinset and
granite on the outside.
I don't know about your insert, but mine already has screws, that hold
it together, intruding into the fire box.
OK, just emailed Rutland and asked which cement to use. They have
high heat silicones, too, and all kinds of weird cements that bond
Most logical advice yet...thanks, Daddy
(yeah, he's my Dad)....
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