At what slope must the ground grade move away from the foundation for the first 10 feet?

The correct required slope for the ground grade to move away from the foundation is typically 2%. This means that in the first 10 feet away from the foundation, the ground needs to drop at least 2% in slope to ensure proper drainage. This is essential in preventing water from pooling near the foundation, which can lead to water intrusion and structural damage over time.

The 2% slope recommendation is a commonly accepted standard in building codes and practices, as it provides an efficient drainage path for surface water runoff. It helps direct rainwater away from the foundation, reducing the risk of foundation settling, basement flooding, and moisture-related issues.

While other slopes like 1%, 3%, and 4% may have specific applications in different contexts, the 2% slope best balances adequate drainage with practical excavation and landscaping methods. A slope greater than 2% may complicate landscaping or could be unnecessary for effective water management in most residential settings. Therefore, while those alternatives might be applicable in other scenarios, they do not meet the established standard for this requirement.