What is the purpose of damp-proofing in CMU walls?

Damp-proofing in CMU (Concrete Masonry Unit) walls is primarily aimed at preventing moisture penetration. This is essential in construction as moisture intrusion can lead to various detrimental effects, such as mold growth, structural damage, and deterioration of materials over time. By implementing damp-proofing measures, a barrier is created that restricts water from moving through the wall, thereby maintaining the integrity of the structure and providing a more comfortable indoor environment.

Effective damp-proofing techniques often involve applying a waterproof membrane or coating to the exterior of the CMU walls or incorporating moisture-resistant materials. This not only helps in keeping the interior dry but also protects electrical systems, finishes, and furnishings from water damage. The focus on preventing moisture penetration distinguishes this purpose from structural enhancements, weight considerations, or aesthetic improvements which do not directly address moisture management.