Mendota CHELSEA M-27, Installation And Operating Instructions Manual

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85-03-01120 M27 Page 26
Suitable Mantel, Facing & Hearth Pad Materials
Use of ceramic glazed tiles as facing materials around a Mendota Fireplace is approved. Use caution when selecting tile
adhesives. Avoid premixed tile adhesives which contain products that can off gas for long periods when exposed to heat. Use
Portland cement based unmixed tile adhesives or RTV Silicone to attach ceramic glazed tiles as facing in hot areas around this
Fireplace. If using RTV silicone, allow a minimum 48 hours cure time for the silicone to cure before firing this Fireplace after tile
application.
Marble, Granite and Natural Stones
Marble, granite and other natural stone products are approved for use as mantel, facing and hearth pad materials with the
following limitations and understanding of these cautionary statements:
Never use a one-piece marble, granite or natural stone that is water jet or mechanically cut in a U -shape
as facing material to cover the sides and top areas around this product. Doing so can lead to crack
formation at the inner corners of the U sha pe due to thermal expansion.
Figure 3-18 Three Piece Stone
Most marble slabs and marble tiles contain a polyester resin coating while most granite slabs and granite tiles contain epoxy
resin coatings. The polyester resin coatings and the epoxy resin coatings provide structural strength to the stone slabs and
prevent cracking, chipping and breakage during shipping and handling. These coatings also provide a glossy or satin surface
finish and help seal the stone surface.
The polyester resin used on marble slabs can discolor when exposed to temperatures greater than 150
o
F
and will structurally fail at temperatures above 230
o
F. The epoxy resin coating used on granite slabs are
resistant to discoloring and structural failures up to 3 50
o
F.Mendota does not assu me any liability for
discoloring, flaking or cracking of marble or granite.
Temperatures on facings around Mendota Gas Fireplaces can reach 350
o
F
directly outside the top convection air gap and as high as 210
o
F at the
maximum allowed mantel protrusion level above the top convection air gap.
These temperatures can discolor polyester resin coated marble facings and
can cause the polyester resin coating to fail near the top convection air gap.
Mendota Fireplace cannot guarantee suitability of use of any
marble slabs or tiles that have a polyester resin coating applied
to it and cannot guarantee against discoloration or structural
failure of marble or polished stone facings that have a polyester
resin coating. Consult with your local stone supplier.
Prior to use of any marble, granite or polished stone facing material,
especially white colored ones, run heat exposure tests on a sample piece.
Expose sample pieces to temperatures between 275
o
F and 350
o
F for a period
of eight hours. Compare the heat exposed sample to a control unheated
Figure 3-19 Top Air Gap
TOP AIR
GAP