practical installation. On warehouse, shop or other
storage type facilities, where esthetics is not
essential, insulation baskets or poultry netting and
their connections may be shown and specified for the
insulation retainer system. The insulation location
is dependent upon the use or absence of a separate
roof deck. The vapor retarder location is dependent
on the climate as noted in paragraph VAPOR RETARDER.
The required R-value for the insulation will be
determined and shown at the appropriate details on
the drawings. The required R-values for the
insulation will never be less than the R-values used
in the Energy Budget Analysis. The R-values shown
on the drawings should be greater than those used in
the design analysis to account for thermal bridges.
Provide about a one-third increase (or as local
experience has shown, if different) in R-value over
what is calculated; that is, if an R-value of 3 is
needed in metric (metric units are square meter K/W)
(16 in I-P with units of h x square feet x degree
F/Btu) use an R-value of 4 (21) in the contract. If
an analysis of thermal bridges in the design gives a
requirement greater or less than this, it should be
used.
Flame spread and smoke development ratings of
exposed insulation, to include facing, shall comply
with the requirements of MIL-HDBK 1008C. Exposed
insulation will be faced, mineral fiber type, only;
cellular plastic insulations will not be exposed.
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Thermal resistance of insulation shall be not less than the R-values shown
on the contract drawings. R-values shall be determined at a mean
temperature of 24 degrees C 75 degrees F in accordance with ASTM C 518.
Insulation shall be a standard product with the insulation manufacturer,
factory marked or identified with insulation manufacturer's name or
trademark and R-value. Identification shall be on individual pieces or
individual packages. [Blanket insulation shall have a facing as specified
in paragraph VAPOR RETARDER]. Insulation [, including facings,] shall have
a flame spread not in excess of [_____] and a smoke developed rating not in
excess of [_____] when tested in accordance with ASTM E 84. The stated
R-value of the insulation shall be certified by an independent Registered
Professional Engineer if tests are conducted in the insulation
manufacturer's laboratory. Contractor shall comply with EPA requirements
in accordance with Section 01670 RECYCLED / RECOVERED MATERIALS.
2.7.1
Polyisocyanurate Rigid Board Insulation
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NOTE: Detailed information concerning EPA
requirements on recycled/recovered materials is
available at the following URL's:
htpp://www.epa.gov/cpg/products/ and then click on
the appropriate item from the list (building.htm for
building insulation, for example).
http://www.epa.gov/cpg/products.htm (similar
results).
SECTION 07416A
Page 22
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