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WHEN
AND HOW TO USE WEATHER RESISTIVE BARRIERS
As part of a whole-wall design, weather-resistive barriers need
to be integrated with other wall system components, including
structure, insulation, vapor retarder, air retarder (if separate),
and flashing systems. A comprehensive approach to water management
prevents water from reaching the sheathing or framing. Primary
water management strategies include water-shedding characteristics
that include overhangs and exterior claddings. Secondary (redundant)
water management usually employs a weather-resistive barrier to
protect the sheathing and framing from moisture damage. A weather-resistive
barrier is a drainage plane. It allows water that has penetrated
past the siding to drain away from the wall system. Building paper
or housewrap is usually used to form the barrier. Attaching siding
to furring strips provides an air gap between the siding and weather-resistive
barrier that improves drainage and addresses related moisture
issues.
Next:
INSTALLATION
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