What is the minimum vertical size of the attachment flange of a weep screed installed on the foundation wall before attaching exterior lath?

What is the minimum vertical size of the attachment flange of a weep screed installed on the foundation wall before attaching exterior lath?

• A. 4"
• B. 3-1/2"
• C. 3"
• D. 4-1/2"

Answer: (B)

You need enough height on the attachment flange so the exterior lath can be securely fastened and the first coat of stucco has room to sit above the foundation, with a clear drainage path for moisture. When a weep screed is installed on a foundation wall, the flange provides the base for nailing or screwing the lath and for the bottom edge of the stucco to project correctly, creating a drip and drainage gap that keeps moisture away from the wall. The minimum height specified is 3-1/2 inches. This size balances having sufficient surface for fasteners and for the lath to be anchored and wrapped with the stucco, while not protruding more than necessary. Using less than this can compromise fastener support and drainage, while more is usually unnecessary unless the wall assembly requires it.

You need enough height on the attachment flange so the exterior lath can be securely fastened and the first coat of stucco has room to sit above the foundation, with a clear drainage path for moisture. When a weep screed is installed on a foundation wall, the flange provides the base for nailing or screwing the lath and for the bottom edge of the stucco to project correctly, creating a drip and drainage gap that keeps moisture away from the wall.

The minimum height specified is 3-1/2 inches. This size balances having sufficient surface for fasteners and for the lath to be anchored and wrapped with the stucco, while not protruding more than necessary. Using less than this can compromise fastener support and drainage, while more is usually unnecessary unless the wall assembly requires it.