What is the minimum slope percentage required for ground adjacent to a foundation?

The minimum slope percentage required for ground adjacent to a foundation is crucial for proper drainage and to prevent water accumulation around the foundation, which can lead to various structural issues, such as settling and water infiltration. A slope of 2% translates to a fall of 2 inches over a 10-foot distance, which is adequate for guiding water away from the foundation effectively.

This slope is considered the minimum standard to ensure that rainwater or surface water drains away from the structure, reducing the risk of moisture-related problems, which can compromise the integrity of the foundation and lead to costly repairs. A slope that is too shallow (less than 2%) may not effectively direct water away, making the structure more vulnerable to water damage. Conversely, steeper slopes, while effective, are not often required in residential settings where the 2% slope is usually sufficient for drainage needs.