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Frequently Asked
Questions About
Flashing and
Building Envelope Design.
We try to anticipate questions you
might have about our PRODUCT / SERVICE
and provide the answers here. If you
need additional information send email
to info@gdconstructiongroup.com
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1.
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Is flashing
required with EIFS?
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Yes. As with all wall cladding,
flashing is an important component
required by building codes. At
points where water can enter the
wall it should be directed to the
exterior face of the cladding with
flashing. Transition areas such as
decks or roof/wall intersections are
typical areas where flashing must be
installed. Openings for windows and
similar through-wall penetrations
require jamb, head, and sill
flashing to direct water to the
exterior face of the cladding.
Note: Complete moisture protection
requires rough opening protection
and the integration of air seals,
sealants, and flashings.
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What are the most
common entry points for water in
building envelope walls?
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As with all claddings, the most
common water entry points in a wall
are through or around windows,
transitions from roof to walls, and
transition from wall claddings to
doors and chimneys. This coupled
with improperly installed or missing
flashing and sealants, can allow
water to penetrate behind EIFS, or
any other cladding, and into the
wall cavity, where it can
potentially cause moisture damage.
Some of these problems are inherent
in the components themselves and
other result from incorrect
installation practices.
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Is EIFS more
vulnerable to damage from moisture
intrusion than other wall claddings?
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No. Moisture intrusion is a
potential threat to durability of
materials in wall construction,
regardless of cladding type.
Moisture intrusion should be avoided
by following sound design and
construction practices mandated by
building codes.
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Are EIFS vapor
permeable?
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Yes, but depending on the
manufacturer and the product
selected, the EIFS vapor
permeability may vary. When
requested, the EIFS manufacturers
can perform a Water Vapor
Transmission Test for specific walls
to evaluate the tendency for
condensation to occur.
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What is "EIFS
with drainage"?
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EIFS with drainage is conventional
EIFS installed over a
water-resistive barrier, with
provisions for discharging of
incidental water that may enter
behind the insulation board. In the
event of a breach of the EIFS, the
drainage path for moisture exists
behind the EIFS to drain water to
the exterior.
Note: EIFS with drainage is not
meant to accommodate rainwater that
penetrates through other components
of construction. Flashing is
required where rainwater may
penetrate other components and at
the interface of different
components.
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Is a
water-resistive barrier required
prior to installing EIFS in
residential construction?
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EIFS manufacturers recommend the
use of water-resistive barriers over
moisture sensitive substrates to
provide additional protection in the
event of a component failure. Local
building codes will stipulate
whether this is a requirement or
not.
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