NOTE: EIFS are often used for retrofit over
existing unit walls. When the bonding conditions of
the retrofit is deemed poor for use with adhesively
applied Class PB EIFS, a corrosion resistant,
self-furring metal lath can be mechanically fastened
to the masonry wall to support the adhesive.
Delete this paragraph if metal lath is not required.
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Conform to ASTM C 847, 1.4 kg/sqm (2.5 lb/sqyd), self-furring, galvanized.
2.5
MECHANICAL FASTENERS
Corrosion resistant and as approved by EIFS manufacturer. Select fastener
type and pattern based on applicable wind loads and substrate into which
fastener will be attached, to provide the necessary pull-out, tensile, and
shear strengths.
2.6
THERMAL INSULATION
2.6.1
Manufacturer's Recommendations
Provide only thermal insulation recommended by the EIFS manufacturer for
the type of application intended.
2.6.2
Insulation Board
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NOTE: Select R-Value required in accordance with
ASHRAE 90.1, except for one and two family
residential buildings which must meet the Department
of Energy Energy Star requirements. See UFC
3-400-01, Energy Conservation, for additional
information.Use recognized computation methods in
agreement with the ASHRAE Handbook of Fundamentals.
Do not specify thermal insulation over 100 mm 4 inch
thick as part of the EIFS. If the insulating value
required to meet energy budget can not be achieved
within the 100 mm 4 inch limitation, provide
additional insulation as separate item on interior
of EIFS. Specify such insulation under appropriate
separate specification section.
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Insulation board shall be standard product of manufacturer and shall be
compatible with other systems components. Boards shall be factory marked
individually with the manufacturer's name or trade mark, the material
specification number, the R-value at 24 degree C 75 degree F, and
thickness. No layer of insulation shall be less than 20 mm (3/4 in) thick.
The maximum thickness of all layers shall not exceed 100 mm 4 in.
Insulation Board shall be certified as aged, in block form, prior to
cutting and shipping, a minimum of 6 weeks by air drying, or equivalent.
a.
Thermal resistance:
As indicated
b.
Insulating material: [ASTM C 578] Type I as recommended by the
EIFS manufacturer and treated to be compatible with other EIFS
components. Age insulation by air drying a minimum of 6 weeks
SECTION 07240
Page 20
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