What is the minimum number of inches wood siding must extend below the sill plate?

The minimum requirement for wood siding to extend below the sill plate is established to create a proper drainage plane and protect the structure from moisture penetration. By having the wood siding extend at least 1 inch below the sill plate, it helps ensure that any water that might come down is directed away from the foundation and does not pool around it.

This distance is crucial because it minimizes the chance of water leaks, mold growth, and wood rot that can be caused by insufficient clearance. Therefore, extending the siding below the sill plate by at least 1 inch is a common building practice that is often mandated by building codes to promote durability and longevity in construction. Making sure this requirement is met contributes to the overall integrity of the building and reduces maintenance issues over time.