At what minimum height must the weep screed be placed above the earth in exterior plaster applications?

The requirement for the minimum height of the weep screed in exterior plaster applications is established to ensure proper drainage and to protect the building's structural integrity. The correct answer is 4 inches, which is the minimum height above the earth that the weep screed should be placed.

By setting the weep screed at this height, it prevents moisture from wicking up into the plaster and the underlying materials that could lead to deterioration, mold growth, and other issues. This 4-inch minimum provides sufficient clearance for water runoff and mitigates the risk of damage from standing water or soil contact, which can cause the plaster to fail over time.

In contrast, heights like 2 inches, 3 inches, or 5 inches either do not provide adequate drainage (in the case of 2 and 3 inches) or are unnecessarily high (in the case of 5 inches), potentially complicating installation or increasing costs without providing additional benefit. Therefore, the 4-inch height strikes the right balance between protecting the building and maintaining practical construction standards.