Weep holes - vented rain screen principle

Exterior · Masonry · printed page 315 (PDF page 316)

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Book index entries

Rain Screen Principle – Vented Vented Rain Screen Principle Weep Holes – Vented Rain Screen Principle

Text in the illustration

foundation wall
high air pressure
weep holes allow air into cavity (to equalize pressure) while allowing water to drain out
flashing projects slightly beyond foundation wall and extends up the face of the stud wall about 6" behind the building paper
perspective view
sheathing paper protects wall from moisture and extends down to overlap bottom flashing
wall framing
air gap
sheathing
low air pressure
medium air pressure
floor framing
foundation
cross section

Generated explanation

The illustration pairs a perspective view of a brick veneer wall with a cross section through the veneer, framed wall, floor framing, and foundation. Weep holes at the base of the veneer admit air into the cavity to equalize pressure while allowing water to drain out. The section identifies high exterior air pressure, medium cavity pressure, and low interior pressure to explain the vented rain screen principle. Sheathing paper overlaps bottom flashing, which extends about 6 inches up the stud wall behind the paper and projects slightly beyond the foundation wall. Water droplets depict rain outside the veneer and drainage at the flashing outlet.

Components

brick veneer weep holes air cavity base flashing sheathing paper wall sheathing wall framing floor framing foundation wall window

Materials

brick mortar wood framing concrete building paper

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