Wiktionary
n. 1 A protective measure applied to the exterior of building foundation walls to prevent rising damp 2 (context construction English) treatment of a surface or structure to resist the passage of water in the absence of hydrostatic pressure.
Wikipedia
Damp proofing in construction is a type of moisture control applied to building walls and floors to prevent moisture from passing into the interior spaces. Damp problems are one of the most frequent problems encountered in homes.
Usage examples of "damp proofing".
Ratkill, the company he worked for, was involved in other operations, the building itself containing various divisions which handled woodworm and dry rot elimination, damp proofing, insulation, wood preservation and hygiene, manufacturing its own products for these particular markets.