This document discusses causes of dampness in buildings and methods of damp proofing. The main causes of dampness are moisture rising up walls from the ground, rain penetrating external walls and roofs, and condensation. Effects of dampness include unhealthy conditions, damage to building materials and structures, and deterioration of electrical fittings. Methods of damp proofing discussed are using damp proof courses, integral damp proofing of concrete, cavity wall construction, surface treatments, guniting, and pressure grouting.