This document discusses various methods of damp proofing in construction to prevent moisture from passing through building walls and floors. It outlines membrane damp proofing, integral damp proofing, surface treatments, guniting, and cavity wall construction. Surface treatments are further explained, including penetrating sealers, surface-applied corrosion inhibitors, sealers, high-build coatings, membranes, and overlays. Specific examples of penetrating sealers and surface-applied corrosion inhibitors are provided. High-build coatings and membrane systems are also described in terms of their thickness and application to concrete surfaces.