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Double slate damp proof course (DPC). A pointless retrofit chemical DPC installed above.

Schrijver (“Dutch”) damp proofing system. It would be wrong to call this a damp proof course (DPC).

Podium deck from 1970s. Asphalt damp proof course (DPC).

Bitumen damp proof course (DPC).

Rigid damp proof course (DPC) circa 1875. Terracotta blocks also provide ventilation to the subfloor.