It is best practice for the top of a foundation wall to extend a minimum of 8 inches above the finished grade adjacent to the foundation at all locations. Maintaining sufficient foundation height above grade helps protect the building assembly from moisture-related issues.
Extending the foundation wall above grade helps avoid placing the critical joint between the foundation wall and exterior wall directly at grade level.
When this joint occurs too close to grade, it becomes more susceptible to water infiltration caused by splash-back, drainage issues, and moisture accumulation at the building perimeter.
Certain conditions may require exceptions to the typical foundation height above grade recommendation. Examples include:
In these situations, additional detailing and waterproofing coordination may be necessary to maintain moisture protection.
Maintaining adequate foundation height above grade helps reduce the risk of water intrusion at vulnerable wall-to-foundation transitions. Proper coordination of grading, waterproofing, and wall detailing supports long-term durability and building envelope performance.
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