USG Casting Fireplace Surrounds - Manual (Page 6)

In most cases, building codes leave the final installation and
configuration up to the general contractor or installer. Building
codes may not be clear regarding installation procedures; some
may not even address gypsum cement fireplace surrounds and
how heat can affect them.
However, there is a definite trend toward the development of specifications as part of building codes. Therefore
it is important for you to understand that you must periodically check building codes in relevant market areas,
since it is easier to modify your products as codes are developed than to have codes adopted and enforced
without your knowledge.
Code requirements may address flame spread, smoke contribution, structural considerations, and setback
distances of the surrounds from the firebox. All products used in fireplaces should conform to your local and
state building code regulations, along with the firebox manufacturers’ recommendations regarding placement
and installation of surrounds.
Code documents in your geographic region will include one or more of the following:
– International Building Code (IBC)
– International Residential Code (IRC)
– Uniform Building Code (UBC)
– National Building Code (NBC)
– Southern Building Code (SBC)
– Local Building Code
There are also other relevant documents to be aware of, such as National Fire Protection Association (NFPA)
information.
While the gypsum cement products used for fireplace surrounds are considered noncombustible by various
building codes, gypsum cements will deteriorate when exposed to high temperatures for extended periods. For
this reason we recommend, when possible, that setbacks for the fireplace surrounds and mantels follow code
recommendations for combustible materials to minimize the effects of prolonged heat exposure to the surround.
Since there are many types of fireboxes and inserts, follow the manufacturers’ requirements along with the
recommended building codes. While it is possible for gypsum cement fireplace surrounds to be placed closer
to the firebox than a surround made from combustible material, it is essential to understand the heat effects of
specific fireboxes and inserts on the gypsum cement fireplace surrounds you manufacture. Understanding this
will allow you to match your surround designs with thermal profiles of specific fireboxes and inserts.
Planning
Building Code Considerations
6 Casting Fireplace Surrounds