Concrete and masonry foundation walls shall be waterproofed _____.

Waterproofing concrete and masonry foundation walls is vital for protecting structures from moisture intrusion, which can lead to various issues like mold growth, deterioration of materials, and structural damage. Proper waterproofing measures address potential water infiltration both from the exterior and the interior.

Waterproofing from the outside involves applying materials or membranes that prevent water from penetrating the foundation wall due to hydrostatic pressure from the surrounding soil. This is crucial, especially in areas with a high water table or where drainage systems are insufficient.

On the other hand, waterproofing from the inside can also be essential, particularly in situations where external waterproofing may be compromised or where additional moisture control is necessary. Interior waterproofing methods may include coatings, sealants, or drainage systems that redirect water and protect the interior space.

In essence, effective waterproofing of foundation walls should ideally incorporate both external and internal strategies to provide a comprehensive defense against moisture. This multifaceted approach ensures that potential vulnerabilities are addressed, leading to a healthier and more durable building. Hence, the option that states all methods are included reflects the best practice in foundation waterproofing.