What is the minimum drop in grade required within the first 10 feet to ensure proper drainage away from foundation walls?

The minimum drop in grade required within the first 10 feet to ensure proper drainage away from foundation walls is typically 6 inches. This measurement is important because it helps to direct water away from the foundation, reducing the risk of water pooling around the base of the structure, which can lead to soil erosion, foundation damage, and other moisture-related issues in basements or crawl spaces.

A 6-inch drop over the first 10 feet results in a slope of 1 inch for every 2 feet, which is generally considered effective for efficient drainage. This ensures that water flows away from the foundation rather than towards it, maintaining the integrity of the building structure.

Other options, while they may seem plausible, do not align with best practices for drainage. A steeper drop might be excessive and could create other issues, such as erosion, while a smaller drop may not effectively direct water away, increasing the risk of water accumulation and damage. Therefore, a 6-inch drop strikes a balance between effectiveness and practicality, making it the recommended standard for proper drainage away from foundation walls.