HomeMy WebLinkAboutBuilding Compliance Report 2011-6-6
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Exterior Wall Envelope
Self-Certification Form
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Permit#
To conform to the 2008 Oregon Residential Specialty Code (ORSC), Section
R703.1.1, I am notifying the building official that I am aware of the exterior. wall
envelope requirements of R703.1.1, and hereby certify that the components of
the exterior wall envelope have been installed in accordance with the code
requirements. [Section R703.1.1 is provided for reference on the reverse side of
this form.]
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Signatu re
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Date
Revised: 2/8/2010
Excerpt from 2008 Oregon Residential Specialty Code Section R703, Exterior Covering:
R703.1.1 Exterior Wall Envelope. To promote builCling durability, the exterior wall envelope shall
be installed in a manner that water that enters the assembly can drain to the exterior. The envelope
shall consist of an exterior veneer, a water-resistive barrier as required in R703.2, a minimum 1/8
inch space between the water-resistive barrier and the exterior veneer, and integrated flashings as
r~quired in R703.8. The required space shall be formed by the use of any non-corrodible furring
strip, drainage mat or drainage board. The envelope shall provide proper integration of flashings
with the water-resistive barrier, the space provided and the exterior veneer. These components, in
conjunction, shall provide a means of draining water that enters the assembly to the exterior.
Exceptions:
1. A space is not required where the exterior veneer is installed over a water-resistive barrier
complying with section R703.2 which is manufactured in a manner to enhance drainage and
meets the 75% drainage efficiency requirement of AsTM E2273 or other recognized
national standards.
2. A space is not required where window sills are equipped with pan flashings which drain to
the exterior surface of the veneer in a through wall fashion: All pan flashings shall be
detailed within the construction documents and shall be of either a self-adhering
membrane complying with AAMA 711-07 or of an approved corrosion-resistant material or
a combination thereof. Self-adhering membranes extending to the exterior surface of the
veneer shall be concealed with trims or other measures to protect from sunlight.
3. A space is not required where the exterior veneer is manufactured in a manner to enhance
drainage and meets the 75% drainage efficiency requirements of ASTM E2273 or other
recognized national standards and is installed over a water resistive barrier complying with
section R703.2.
4. A space is not required where the exterior veneer is matching an existing exterior finish as
in additions, alterations, or repairs.
5. A water-resistant exterior wall envelope shall not be required over concrete or masonry
walls designed in accordance with Chapter 6 and flashed according to section R703.7 or
R703.8.
6. Compliance with the requirements for a means of drainage, and the requirements of
Section R703.2 and Section R703.8, shall not be required for an exterior wall envelope that
has been demonstrated to resist wind-driven rain through testing of the exterior wall
envelope, including joints, penetrations and intersections with dissimilar materials, in
accordance with ASTM E 331 under the following conditions:
6.1. Exterior wall envelope test assemblies shall include at least one opening, one control
joint, one wall/eave interface and ~ne wall sill. All tested openings and penetrations
shall be representative of the intended end-use configuration. .
6.2. Exterior wall envelope test assemblies shall be at least 4 feet by 8 feet in size.
6.3.. Exterior wall assemblies shall be tested at a minimum differential pressure of 6.24
pounds per square foot.
6.4. IExterior wall envelope assemblies shall be subjected to a minimum test exposure
duration of 2 hours.
The exterior wall envelope design shall be considered to resist wind-driven rain where the
results of the testing indicate that water did not penetrate: control joints in the exterior
wall envelope; joints at the perimeter of openings penetration; or intersections of
terminations with dissimilar materials.