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There are three main types of damp proofing in construction: physical, chemical, and membrane. Physical damp proofing involves applying waterproofing materials, such as bitumen or mastic asphalt, to the exterior of a building to protect it from moisture.
Chemical damp proofing involves injecting specialised chemicals into walls or other surfaces to provide a barrier against water. Finally, membrane damp proofing involves the application of a waterproof membrane to the exterior of a building, which creates an impermeable barrier to prevent moisture from entering the structure.