When designing flashing at the base of your walls, it must be placed above the finished grade. Flashing at base of wall conditions are critical for preventing moisture penetration and supporting proper cavity drainage.
Care must be taken to ensure flashing and weep holes are located high enough above grade—typically a few courses—so they are not covered by future grading or landscaping.
Flashing at the base of the wall also prevents rising damp, which is the upward movement of groundwater through masonry by capillary action. Rising damp can lead to staining and efflorescence if not properly controlled.
Proper flashing placement helps interrupt this movement and protects the wall assembly from long-term moisture-related damage.
Flashing also acts as a bond break between the masonry veneer and the concrete foundation. This separation allows for differential movement between materials and reduces the risk of cracking within the wall assembly.
In construction without a basement, flashing at the base of the wall may also serve as a termite shield, helping prevent insects from entering the structure.
When designing masonry construction, these considerations help ensure proper function and reduce the risk of moisture penetration, cracking, staining, and termite damage.
Proper detailing of flashing at base of wall conditions supports moisture control, prevents rising damp, and allows for material movement. Careful placement above grade and coordination with weep systems ensures long-term performance of the wall assembly.
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