From:
"Pete Bracken" <caverpete7@zzzzzzzzzzzzz>
Date:
Tue, 31 May 2005 09:45:51 -0400
Subject:
Mortar
Hi Shawn:
Quoted text begins.From: daedelus lanthanien <daedeluslanthanien@----------- >
Subject: [stone] Re: Mortar, and again! FIRE.
End of quote.
Quoted text begins.IMHO. It will not matter if you install the granite in fireclay, it will
be
destroyed eventually. It is ok to use it as a hearth, but my advice is to
not to install it on the firebox floor
End of quote.
As as tilesetter, I agree with Daed: the granite will defititely
disintegerate, maybe even quickly because it is thin, when exposed to
flame/heat. I have used different granites in outdoor fire rings and
eventually granite ends up as a pile of aggregate (its constituent
crystals). Stick with firebrick for the firebox.
Quoted text begins.Using thin granite is a little iffy too if you are bonding it to a wooden
sub-floor. 3/8" tiles are penetrated by heat quickly.
End of quote.
Here in Virginia (and probably the rest of the U.S.) the building code
calls for 3" thick of non-combustible material for a hearth or woodstove
platform. This can be a 3" slab of stone, 3" of bricks and mortar, or in
your case, 2.5" of layered concrete board (like Durock) topped with thinset
mortar and granite tiles. If your floor is wood then you have to plan this
well in order to have everything flush with the finished floor. If your
floor is concrete or you have a raised masonry hearth, then you are fine to
start tilesetting. Also, don't use any of the epoxy mortars that are
available as they can't handle the heat.
regards, Pete Bracken (Bracken Tile & Stone)
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