How far should damp proofing on below-grade masonry foundation walls extend above the finished grade?

Damp proofing on below-grade masonry foundation walls is an essential practice to prevent moisture intrusion that can lead to structural damage. The recommended extension above the finished grade is 6 inches. This distance is chosen because it effectively helps to redirect surface water away from the foundation, thereby reducing the likelihood of moisture penetration into the wall and subsequent damage. By extending the damp proofing 6 inches above the finished grade, you create a barrier that is high enough to limit the risk of moisture accumulation while still accommodating natural settling and other changes that may occur over time. This standard is supported by building codes and best practices in construction, ensuring longevity and integrity of the foundation by providing adequate protection against water infiltration.