applicable section(s). Substrate must be sound,
true, plumb, and within flatness tolerance of EIFS
manufacturer, usually not more than 6 mm within 3000
mm (1/4 inch within 10 feet). If existing substrate
can not be brought up to these requirements, a new
substrate should be provided.
For EIFS installed over new sheathing board, provide
sheathing in this section. If sheathing is to be
installed on metal furring or studs, provide furring
or studs in Sections 05400, "Cold-Formed Metal
Framing," specifying EIFS manufacturer's tolerance
requirements.
In marine environments, light gage metal framing is
subject to corrosion if water infiltrating through
the EIFS is allowed to accumulate in runners. In
locations near salt water, do not use metal framing
for the support of the substrate or detail carefully
to prevent water accumulation.
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NOTE: The coordination of work with other trades is
important for the performance of the the EIFS wall
assembly, in particular the installation of flashing
above windows and door heads, beneath window and
door sills, at roof/wall intersections, decks,
intersection of lower walls with higher ones, above
projecting features, and at the base of the wall to
ensure that where water is likely to penetrate the
wall assembly, it will be drained to the exterior at
the source of the leak.
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NOTE: EIFS provides insulation and exterior finish
for both new and renovated buildings. The systems
are available in two classes: PB and PM.
a. Class PB Systems are typically composed of a 2
mm to 6 mm (1/16 inch to 1/4 inch) cementitious or
non-cementitious base coat, one or more layers of
polymer-coated glass fiber mesh, and a
non-cementitious finish coat. PB systems are most
commonly used over molded expanded polystyrene
(MEPS) insulation which is adhesively attached to
the substrate. The non-cementitious base coat
punctured by sharp objects. The MEPS insulation
allows water vapor migration, which can either
ventilate the system beneficially or allow moisture
into the substrate. Class PB EIFS should not be
used in first floor, high traffic areas, or in areas
where pedestrians congregate. Where so used, they
must have at least one layer of 567 g (20 ounce)
reinforcing fabric mesh followed by one layer of
minimum 113 g (4 ounce) reinforcing mesh. Class PB
systems are the least expensive and most widely used
SECTION 07240
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