MIL-HDBK-1011/1
Section 9: FINISHES
Scope. This section covers gypsum wallboard, plastering systems,
9.1
acoustic tile, and metal ceiling suspension systems; flooring materials; and
paints and stains, including protective coatings.
General Design Considerations. The general problems encountered
9.2
after the design selection and installation of most finish materials are
moisture infiltration, condensation and salt spray buildup, ultraviolet ray
deterioration (of exterior finishes), and under certain design conditions,
interior materials being subjected to wind penetration through exterior walls.
As an example, in certain tropical areas, the primary cause of the impairment
of a metal suspension system for ceilings is the high humidity level. All
metal items are susceptible to "sweating" under this condition. The slightest
difference in the temperature of the metal and the surrounding air temperature
and dewpoint will condense moisture on the metal. If the metal is a ferrous
metal, the subsequent rust and stain create a maintenance problem with the
materials. Therefore, it is imperative that continual awareness of the above-
addressed problems be maintained during the design stage.
9.3
Gypsum Wallboard. Gypsum wallboard is an economical wall finishing
material if installed and used according to manufacturer's instructions. It
is also an ideal material to provide adequate fire-rated protection for
interior areas. Nevertheless, gypsum board is susceptible to damage in
bachelor enlisted quarters (BEQ) and other personnel type facilities. Also,
in a tropical environment, deterioration through absorption of moisture and
termites attacking the paper facing may be a problem. Although 1/2-inch thick
board may be used in some areas, minimum thickness of 5/8-inch is recommended.
The use of polyvinyl chloride (PVC) trim, stops, screens, vents and expansion
joints is recommended in lieu of zinc-coated ferrous metal in the tropics.
9.4
Cement-Fiber Board
9.4.1
General. This material, cement-fiber board, is fire-rated,
asbestos-free, and highly resistant to impact, rot, and moisture.
Installation materials and methodology are similar to gypsum wallboard. Its
high impact resistance makes it an excellent economical alternative to plaster
where the potential for damage precludes gypsum wallboard in high use/traffic
areas such as living quarters and corridors and high humidity areas such as
kitchens and showers. Cement-fiber board is also suitable for exterior
soffits.
9.4.2
Special Board Types. Many manufacturers produce prefinished,
decorative cement-fiber panels providing concrete, plaster, and fine aggregate
surface appearance for exterior siding. The board may also be used as a
backer board for ceramic tile and for exterior synthetic plaster finishes.
(See para. 9.5.2)
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