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What is the "R" Value for gypsum board?
For purposes of calculating "U" values, the "C" factor for 1" gypsum board is 1.2;
Resistance "R" for 3/8" board is 0.32; for 1/2" board 0.45; for 5/8" board 0.56;
and for 1" board 0.83.
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What's the difference between "regular" and "type X" gypsum wallboard?
ASTM C 36 designates two types of gypsum wallboard, regular and type X. Type X wallboard,
which is typically required to achieve fire resistance ratings, is formulated by
adding noncombustible fibers to the gypsum. These fibers help maintain the integrity
of the core as shrinkage occurs, providing greater resistance to heat transfer during
fire exposure.
To receive the "Type X" designation under ASTM C 36, a gypsum wallboard product
must be shown to achieve not less than a one hour fire resistance rating for 5/8"
board or a 3/4 hour fire resistance rating for 1/2" board applied in a single layer,
nailed on each face of load-bearing wood framing members, when tested in accordance
with the requirements of ASTM E 119, Methods of Fire Test of Building Constructions
and materials.
Additionally, the Gypsum Association requires 1/2" type X gypsum board be shown
to achieve a one hour fire resistance rating when applied to a floor ceiling system,
as described by GA File Number FC 5410, in GA 600, the Gypsum Association Fire Resistance
Design Manual.
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What's the difference between Gold Bond® Fire-Shield® and Gold Bond
Fire-Shield C wallboard?
For additional fire protection, National Gypsum Company manufactures Gold Bond Fire-Shield
C products. Fire-Shield C products are formulated with a mineral core additive that
expands when subjected to heat, which aids in holding the wallboard together during
fire exposure. Fire-Shield C gypsum wallboard meets the Gypsum Association description
of Improved Type X Gypsum Board—"specially formulated gypsum board, meeting all
the requirements of type X gypsum wallboard, with additional properties to further
enhance the fire resistive characteristics of the use of the product in some proprietary
systems".
Gold Bond Fire-Shield C wallboard may be used in designs requiring Fire-Shield (type
X core) of equal thickness, but Fire-Shield (type X core) may not be substituted
in designs that utilize Fire-Shield C (Improved Type X).
Gold Bond Fire-Shield is available in 5/8" thickness. Gold Bond Fire-Shield C is
available in 1/2" or 5/8" thickness.
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What type of gypsum board would you recommend for use on the walls
and ceiling of my indoor swimming enclosure?
None. Gypsum wallboard (including green board) is NOT recommended for use where
there will be direct exposure to water or continuous high humidity conditions such
as found in saunas, steam rooms, gang shower rooms or swimming pool enclosures.
A cementatious tile backer, such as
PermaBase®, or the use of a Portland cement based plaster system should
be considered.
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What is the fire rating for 5/8" Fire-Shield (Type X) Wallboard?
5/8" Fire-Shield Wallboard has no fire rating. Fire ratings are assigned to a complete
construction assembly that may include 5/8" Fire-Shield Wallboard as a component.
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My home was in a flood and the wallboard in my basement was exposed
to flood water. Do I have to replace the wallboard in my basement?
Yes, Wallboard that has been soaked by floodwater can be a permanent health hazard.
When the wallboard finally dries, there will still be mud and contaminants dried
inside and to the wallboard.
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