What is the minimum height a Damp Proof Course (DPC) should be provided above the ground?

The DPC should generally be placed at least 150 mm above the adjacent ground level to prevent moisture ingress from rain splash.

What slope is recommended for flat roofs to prevent water ponding?

A minimum slope of 1 in 60 is recommended to ensure effective drainage.

What is the requirement for overlapping joints in waterproofing membranes?

A minimum overlap of 100 mm is required for both longitudinal and transverse joints to ensure watertightness.

IS 3067

: 1988

Code of practice for general waterproofing and damp-proofing of buildings

CurrentFrequently UsedCode of PracticeArchitectural · Waterproofing and Damp Proofing

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This code establishes the general principles and recommended practices for waterproofing and damp-proofing of buildings. It details the material selection, surface preparation, and application methodologies for treating roofs, walls (DPC), and basements against moisture ingress.

Covers general recommendations for waterproofing and damp-proofing of buildings using various materials and methods.

Quick Reference Values

Minimum slope for flat roofs1 in 60

Minimum height of DPC above ground level150 mm

Minimum overlap for bituminous felts100 mm

Normal thickness of cement concrete DPC25 mm to 40 mm

Practical Notes

Ensure the concrete or masonry substrate is thoroughly cured, completely dry, and cleared of loose dust or laitance before applying bituminous primers.

Pay special attention to detailing at parapet walls, corners, rainwater outlets, and expansion joints, as these are the most common points of waterproofing failure.

A Damp Proof Course (DPC) must be continuous. If vertical pipes or conduits breach the DPC, the junction must be meticulously sealed.