Damp proofing is a construction method used to prevent moisture from penetrating walls and floors. It involves applying a barrier, such as a special coating or membrane, to keep water out. This is especially important in areas with high humidity or where the ground is prone to flooding. Effective damp proofing helps protect buildings from damage caused by mold, mildew, and structural deterioration. Common techniques include installing a damp proof course (DPC) in walls and using waterproofing materials in basements. Proper damp proofing can extend the lifespan of a building and improve indoor air quality.