What is the minimum required tensile strength for the cured membrane?

1.2 N/mm² (MPa) as per Table 2.

Is the membrane required to be resistant to water penetration?

Yes, it must show no leakage when subjected to a water pressure of 0.1 N/mm² for 24 hours (Table 2).

What is the minimum adhesion strength to a concrete substrate?

1.0 N/mm² (MPa) as per Table 2.

IS 15809

: 2008

Liquid applied polymeric waterproofing membranes

CurrentFrequently UsedSpecificationBIMMaterials Science · Roofing Materials

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This standard specifies the requirements and test methods for single-component, liquid-applied polymeric waterproofing membranes used on concrete substrates. It covers the physical properties of the liquid membrane before application and the key performance characteristics like tensile strength, elongation, and water permeability of the cured membrane.

Specifies requirements for liquid applied polymeric waterproofing membranes.

Quick Reference Values

Minimum Tensile Strength1.2 N/mm²

Minimum Elongation at Break150 %

Minimum Adhesion to Concrete1.0 N/mm²

Water Permeability Test Pressure0.1 N/mm² for 24 h with no leakage

Minimum Solid Content60 % by mass

Crack Bridging Capability0.75 mm (Optional Requirement)

Practical Notes

This 2008 edition is superseded by IS 15809:2017. Always refer to the latest version as requirements may have been updated.

Substrate preparation, including cleaning, drying, and priming as per manufacturer's instructions, is critical for achieving the specified adhesion and overall performance.

Ensure uniform application to achieve the specified Dry Film Thickness (DFT), as thin spots are common points of failure.