When used as a component in fire barriers, drywall is a
passive fire protection item, subject to stringent bounding. In
its natural state, gypsum contains the water of crystallization bound in
the form of hydrates. When exposed to heat or fire, this water is
vaporized, retarding heat transfer. Therefore, a fire in one room, which
is separated from an adjacent room by a fire-resistance rated drywall
assembly, will not cause this adjacent room to get any warmer than the
boiling point (100°C) until the water in the gypsum is gone. This makes
drywall an ablative material because as the hydrates sublime, a crumbly
dust is left behind, |
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Alphabetical Listings
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Hawken Drywall Inc
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819 A St # 22, San Rafael, CA 415 454-2660John Sprague Drywall
667 Snow Rd, Sebastopol, CA 707 823-4796
Patches In A Day
5301 Denver Ln, Sebastopol, CA 707 823-8422
Stockham Construction Inc
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475 Portal St # F, Cotati, CA 707 664-0945 |
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which, along with the paper, is sacrificial. Generally, by increasing
the layers of Type X drywall, the more one increases the
fire-resistance of the assembly, be it horizontal, or vertical.
Evidence of this can be found both in publicly available design
catalogues on the topic, as well as common certification listings.
"Type X" drywall is formulated by adding glass fibers to the gypsum,
to increase the resistance to fires, especially once the hydrates are
spent, which leaves the gypsum in powder form. Type X is typically the
material chosen to construct walls and ceilings that are required to
have a fire-resistance rating. |
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