How far must a drainage system extend beyond the outside edge of the footing?

A drainage system must extend at least 1 foot beyond the outside edge of the footing to effectively redirect water away from the foundation. This distance is crucial in preventing water accumulation around the foundation, which can lead to soil erosion, hydrostatic pressure, and ultimately compromise the structural integrity of the building.

Extending the drainage system this distance ensures that rainwater and runoff are diverted far enough away to minimize the risk of water seeping into basement areas or causing damage to the foundation walls. It also helps to protect adjacent landscaping and prevent pooling that can occur from water redirected improperly.

Having a drainage system that goes beyond the minimum requirement can enhance the effectiveness of moisture control in building sites, particularly in regions with heavy rainfall or poor drainage characteristics.