If the crawlspace elevation is below the exterior finish grade, what should be provided?

When the crawlspace elevation is below the exterior finish grade, it is crucial to provide foundation drainage and wall damp-proofing. This is important because a crawlspace that is positioned lower than the surrounding grade can lead to significant moisture problems. Water will naturally flow toward the area with the lowest elevation, which increases the risk of water infiltration into the crawlspace.

Foundation drainage systems help to redirect water away from the foundation footing, reducing the risk of flooding and moisture accumulation. This can include the installation of perforated pipes or drainage tiles that collect and guide water away from the structure.

Additionally, wall damp-proofing is essential to protect the foundation walls from moisture penetration. It creates a barrier that helps prevent water from seeping through the walls and reaching the interior of the crawlspace. This combination of drainage and damp-proofing is critical for maintaining a dry and stable environment under the home, which ultimately protects the structural integrity and reduces the risk of mold and rot in the crawlspace area.

Other options focus on different aspects of crawlspace management but do not directly address the moisture control that is necessary in this specific scenario with a lower crawlspace elevation.