]PART 2
PRODUCTS
2.1
INSULATION
2.1.1
Insulation Types
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NOTE: Specify all types of insulation listed as
Contractor options, except where method of
construction and/or special requirements prohibit
use. Thermal barrier of glass mat gypsum roof board
or suitable roof insulation board must be installed
directly on roof deck when polystyrene board will be
applied over decks constructed of materials other
than poured-gypsum; poured-concrete; nominal 50 mm 2
inch thick, tongue-and-groove wood plank or precast
roof deck panels; or planks approved by FM as
noncombustible roof deck construction.
For SOUTHNAVFACENGCOM projects, do not specify
mineral fiber, glass fiber or cellular glass boards.
Roof insulation should be specified by thermal
resistance (R value) necessary to obtain required
overall thermal transmittance (U value) needed to
satisfy design criteria for particular type of
facility. Thickness of insulation will vary with
type of material furnished to provide specified R
value. When thickness of insulating material is
governed by space limitations or construction
features, R value and corresponding thickness should
be coordinated with space available. Provide
insulation of sufficient thickness to ensure that
temperature of vapor retarder surface, when used,
will be above dewpoint. R value for insulation
should never be less than R value used in design of
heating and/or air conditioning systems.
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NOTE: Roof construction, air-to-air, may include
finish ceilings, provided that ceilings extend over
the entire same roof area; and space above the
ceiling is not vented to the exterior and is not
used as a plenum. Generally, roof insulation over
mechanical rooms need not be increased in thickness
when the mechanical room has no ceiling and the rest
of the building has a ceiling.
Designer will determine the required R-value and
show the R-value at the appropriate detail on the
drawings. The required R-value will never be less
than that used in the Energy Budget Analysis. The
R-value of impermeable faced iso-foams and permeable
faced polyisocyanurate components will be calculated
using the aged R-value of 1.0 square meter K/W ("R"
value 5.56) per 25 mm (inch) of thickness; k = 0.31
W/m.k (k = 0.18).
SECTION 07220
Page 10
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