specified thickness. The range of design R-values
(in IP units) for foam insulations given by ASHRAE
is 5 to 7 per inch. Verify range available from
manufacturers. An aged R-value in SI units of 2
(11, in IP units) can be readily achieved with 50 mm
(2 inches) of insulation.
Cellular plastic insulations (polystyrene,
polyurethane and polyisocyanurate) are thermally
efficient, however, certain precautions should be
observed in their use due to high smoke development
and toxicity of the smoke generated by the burning
of these materials. Cellular plastic insulations
should only be used in anchored veneer masonry walls
where the insulation is completely isolated from the
interior of the building by masonry, including all
penetrations of the interior wythe.
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Rigid board-type insulation shall be extruded polystyrene, polyurethane, or
polyisocyanurate. Polystyrene shall conform to ASTM C 578.
Polyisocyanurate shall conform to ASTM C 1289, Type I, Class 1 or 2, faced
with aluminum foil on both sides of the foam. The insulation shall be a
standard product and shall be marked with not less than the manufacturer's
trademark or name, the specification number, the permeance and R-values.
2.15.1.1
Insulation Thickness and Air Space
The cavity space shall allow for a maximum insulation thickness of [50]
[_____] mm [2] [_____] inches, and a minimum air space of 19 mm 3/4 inch.
2.15.1.2
Aged R-Value
The insulation shall provide a minimum aged R-value of [2] [_____] [11]
[_____] for the overall thickness. The aged R-value shall be determined at
24 degrees C 75 degrees F in accordance with the appropriate referenced
specification. The stated R-value of the insulation shall be certified by
an independent testing laboratory or certified by an independent Registered
Professional Engineer if tests are conducted in the manufacturer's
laboratory.
2.15.1.3
Recovered Material
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NOTE: Detailed information concerning EPA
requirements on recycled/recovered materials is
available at the following URL's:
http://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).
http://www.epa.gov/cpg/pdf/back.pdf which opens up
EPA530-R-98-003 (dated July, 1998, titled BACKGROUND
DOCUMENT FOR PROPOSED CPG III AND DRAFT RMAN III).
Using data from listed locations, fill in blank
space for required percentage of recycled or
recovered material. This is in accordance with the
SECTION 04200
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