Damp-proof membrane

From International Dictionary of Marine Aids to Navigation
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Acronym: dpm

Impervious membrane of bituminous, plastic, or other material placed across the foundation slab of a building, or vertically on the face of a wall, to prevent damp penetration from the external ground. The membrane is connected to the damp-proof course.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM