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Extruded Polystyrene
Insulation Planks: |
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R-Values:
R-20 - Insulating forms only, by test
R-25 - Finished walls by calculation
To determine concrete volumes (Cubic Yards):
Height (feet) X Length (feet) X Thickness (inches)
X .0031 = Cubic Yards
Form Wall Thickness: 2" per side,
continuous
Fire Rating: (Siliceous Aggregate) by test,
without insulation:
4" - 1 hour 6" - 3 hours 8" - 4 hours
STC (Sound Transmission Class):
STC 58 - 8" Concrete, forms and finish, by calculation
Finishing
Techniques:
Interior: Drywall applied directly over
insulation surface, attached with standard drywall screws into
exposed polypropylene forming ties.
Exterior: Synthetic masonry, damproofing
or waterproofing applied directly onto insulation surface per
manufacturer. Prefabricated finishes are attached mechanically into
exposed polypropylene forming ties or to continuos furring strips
with fasteners which are appropriate for exterior use.
In
buildings where people normally work, reside or assemble polystyrene
concrete forms must be fully protected from the interior of the
building by fire resistant material such as 1/2 inch gypsum board
(drywall) or the equivalent. |
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