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SECTION 1403 PERFORMANCE
REQUIREMENTS
1403.1 General.
The provisions of this section shall apply to exterior walls,
wall coverings and components thereof.
1403.2 Weather protection.
Exterior walls shall provide the building with a weather-resistant
exterior wall envelope. The exterior wall envelope shall include
flashing, as described in Section 1405.3.
The exterior wall envelope shall be designed and constructed
in such a manner as to prevent the accumulation of water within
the wall assembly by providing a water-resistive barrier behind
the exterior veneer, as described in Section
1404.2, and a means for draining water that enters the
assembly to the exterior. Protection against condensation
in the exterior wall assembly shall be provided in accordance
with the International Energy Conservation Code.
Exceptions:
1. A weather-resistant
exterior wall envelope shall not be required over concrete
or masonry walls designed in accordance with Chapters 19
and 21, respectively.
2. Compliance with
the requirements for a means of drainage, and the requirements
of Sections 1404.2 and 1405.3,
shall not be required for an exterior wall envelope that
has been demonstrated through testing to resist wind-driven
rain, including joints, penetrations and intersections
with dissimilar materials, in accordance with ASTM E 331
under the following conditions:
2.1. Exterior wall envelope
test assemblies shall include at least one opening, one
control joint, one wall/eave interface and one wall sill.
All tested openings and penetrations shall be representative
of the intended end-use configuration.
2.2. Exterior wall envelope
test assemblies shall be at least 4 feet by 8 feet (1219
mm by 2438 mm) in size.
2.3. Exterior wall envelope
assemblies shall be tested at a minimum differential pressure
of 6.24 pounds per square foot (psf) (0.297 kN/m2).
2.4. Exterior 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 testing indicate that water did not penetrate control joints
in the exterior wall envelope, joints at the perimeter of
openings or intersections of terminations with dissimilar
materials.
1403.3 Structural.
Exterior walls, and the associated openings, shall be designed
and constructed to resist safely the superimposed loads required
by Chapter 16.
1403.4 Fire resistance.
Exterior walls shall be fire-resistance rated as required
by other sections of this code with opening protection as
required by Chapter 7.
1403.5 Flood resistance.
For buildings in flood hazard areas as established in Section
1612.3, exterior walls extending below the design flood
elevation shall be resistant to water damage.
Wood shall be pressure-preservative
treated in accordance with AWPA Ul for the species, product
and end use using a preservative listed in Section 4 of AWPA
Ul or decay-resistant heartwood of redwood, black locust
or cedar.
1403.6 Flood resistance
for high-velocity wave action areas.
For buildings in flood hazard areas subject to high-velocity
wave action as established in Section
1612.3, electrical, mechanical and plumbing system components
shall not be mounted on or penetrate through exterior walls
that are designed to break away under flood loads.
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