What is the minimum required pull-off strength for this type of coating?

The adhesion (pull-off) strength must be a minimum of 1.0 N/mm² (Table 1).

Is this coating 'breathable'?

Yes, the standard requires a water vapour permeability of less than 30 g/m²/24h, which allows the substrate to breathe (Table 1).

How much can a small crack widen before this coating fails?

The coating must be able to bridge a crack up to 0.5 mm wide without failing (Table 1).

How is the water resistance tested?

A coated specimen must show no signs of percolation or dampness after being subjected to a 50-meter head of water pressure for 7 days (Annex A).

IS 15477

: 2004

Acrylic based cementitious composite coatings for water proofing - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Waterproofing and Damp Proofing

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This standard specifies the requirements for two-component, acrylic-based cementitious composite coatings used for waterproofing concrete and masonry surfaces. It covers material composition, physical performance criteria like water permeability and adhesion strength, and the necessary test methods to verify compliance.

Specifies requirements for acrylic based cementitious composite coatings used for waterproofing of concrete and masonry surfaces.

Quick Reference Values

Minimum Adhesion Strength (Pull-off)> 1.0 N/mm²

Water Permeability ResistanceNo percolation at 50 m head of water for 7 days

Maximum Water Vapour Permeability< 30 g/m²/24h

Minimum Crack Bridging Ability0.5 mm

Minimum Pot Life1 hour

Minimum Bond Strength to Damp Concrete> 0.8 N/mm²

Practical Notes

Surface preparation is critical for achieving the specified adhesion strength; the substrate must be clean, sound, and in a saturated-surface-dry (SSD) condition before application.

Always mix the polymer liquid and cementitious powder in the exact proportions recommended by the manufacturer. Incorrect ratios will severely compromise waterproofing performance and durability.

Pay close attention to pot life (typically 1-2 hours). Mix only the quantity that can be used within this timeframe.