What is the minimum allowable slope of ground adjacent to a foundation wall?

The minimum allowable slope of ground adjacent to a foundation wall is essential to ensure proper drainage and to prevent water from pooling near the foundation, which can lead to structural issues over time. A slope of at least 5% is typically recommended because it allows for adequate water runoff. This percentage equates to a drop of 5 feet over a horizontal distance of 100 feet, which is generally sufficient to direct water away from the foundation effectively.

Maintaining this slope is crucial for preventing moisture accumulation that can cause erosion, weaken the foundation, and potentially lead to other issues like mold growth or pest infestations in the building's structure. If the slope is less than this standard, it may not effectively channel water away, increasing the risk of water-related problems.