What are the classes of membranes in this standard?

The membranes are classified into Class I, II, and III based on their crack bridging ability at different temperatures, as per Table 1.

What is the minimum required adhesion strength?

The minimum pull-off adhesion strength required is 0.5 N/mm² after 28 days of air curing, as per Table 4.

How is water impermeability tested?

A 2 mm thick membrane is subjected to 5 bar (approx. 50m head) of water pressure for 7 days. There should be no water penetration, as per Table 4.

What is the minimum tensile strength for a Class II membrane?

The minimum tensile strength for a Class II membrane is 0.5 N/mm², as specified in Table 4.

IS 16186

: 2014

Liquid applied waterproofing membranes based on polymer modified cementitious systems - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Waterproofing and Damp Proofing

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This standard specifies the requirements for two-component, polymer-modified, cement-based liquid-applied waterproofing membranes. It covers classification based on crack-bridging ability, material property requirements, and performance criteria for the cured membrane, such as tensile strength, adhesion, and water impermeability.

Specifies requirements for liquid applied waterproofing membranes based on polymer modified cementitious systems.

Quick Reference Values

Minimum Tensile Strength (Class II)0.5 N/mm²

Minimum Elongation at Break (Class II)50 %

Minimum Adhesion Strength (Pull-Off)0.5 N/mm²

Water Penetration RequirementNo penetration at 5 bar for 7 days

Crack Bridging Ability (Class II, 23°C)0.75 mm

Water Vapour Transmission Rate (max)30 g/m²/24h

Practical Notes

Ensure both liquid and powder components are from the same manufacturer and are within their shelf life.

Surface preparation is critical for achieving the required adhesion; the substrate must be clean, sound, and free from contaminants.

Strictly follow the manufacturer's recommended mix ratio and application thickness to achieve specified performance.