Dampproofing (DampSeal)

Damp Seal is a coating that is cold-applied using a spray-on (or hand applied) system. It is used to cover surfaces to provide your basic damp proofing sealer to foundations to meet minimum building code requirements. It is a process that involves using a mixture (traditionally tar or unmodified asphalt) as a coating on the exterior side of a structure and has one main purpose: stopping the transference or wicking of ground moisture through concrete. It is a basic, acceptable, form of treatment in many situations. Damp proofing is not intended to keep all water and moisture out, but rather its goal is to retard moisture infiltration by blocking the capillaries of concrete. which slows water penetration. Damp proofing is a treatment onto the surface of a structure to resist the passage of water in the absence of hydrostatic pressure.

Drawbacks of damp proofing include an inability to seal larger cracks, large bug holes, holes left by ties, surface protrusions, and potential damage caused by coarse or careless backfilling due to the limited thickness applied and the rigid nature of the product. With proper surface drainage, correctly installed foundation drains at the footing, and the absence of hydrostatic pressure via our DMX drainage board, damp proofing can supply adequate, long-lasting protection.

There is a distinct difference between damp proofing and waterproofing. Damp proofing is intended to keep out soil moisture while waterproofing keeps out both moisture and liquid water.

Differences Between Damp Proofing and Waterproofing

SubjectDamp ProofingWaterproofing




Original Function

Treatment to keep out soil moisture

Treatment to keep out moisture and liquid water


Less than 10 mils

Approx. 80 mils sprayed, 60 mils cured

Resistance to Hydrostatic pressure

Unable to permanently resist water flow under hydrostatic pressure

Resists water flow under hydrostatic pressure

Stability Underground


Retains elasticity and flexibility at low temperatures

Crack Bridging

Little to none

*self heals if punctured
*elongates up to 850% with 98% recovery

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