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IS 15477:2004 is the Indian Standard (BIS) for acrylic based cementitious composite coatings for water proofing - specification. 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.
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Waterproofing and Damp Proofing
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
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.
EN 14891:2017CEN (European Committee for Standardization), Europe
HighCurrent
Liquid-applied water impermeable products for use beneath ceramic tiling bonded with adhesives - Requirements, test methods, evaluation and verification of constancy of performance, classification and marking
Covers cementitious liquid-applied membranes (Type CM) for waterproofing under tiles, a primary use case for IS 15477 products.
AS/NZS 4858:2004Standards Australia / Standards New Zealand, Australia/New Zealand
HighCurrent
Wet area membranes
Specifies performance requirements for membranes used in internal wet areas (bathrooms, laundries), directly aligning with the purpose of IS 15477.
ETAG 022EOTA (European Organisation for Technical Assessment), Europe
MediumWithdrawn
Guideline for European Technical Approval for Watertight Covering Kits for Wet Room Floors and/or Walls
A precursor to EN standards, it established the performance framework for liquid waterproofing in wet areas across Europe.
ASTM C836 / C836M - 18ASTM International, USA
LowCurrent
Standard Specification for High-Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course
Covers liquid-applied membranes but focuses on different chemistries (e.g., polyurethane, asphalt modified) and applications, not specifically acrylic-cementitious types.
Key Differences
≠The Indian standard requires a significantly higher adhesion strength after water immersion (≥1.0 MPa) compared to European (EN 14891 requires ≥0.5 MPa) and Australian (AS/NZS 4858 requires ≥0.2 MPa) standards.
≠IS 15477 specifies a very high water pressure resistance test (50m head of water), which is more stringent than EN 14891 (15m head). This reflects its potential use in water-retaining structures.
≠European and Australian standards (EN 14891, AS/NZS 4858) have detailed classification systems for crack bridging and low-temperature flexibility, allowing users to select products for specific needs. IS 15477 has a single minimum requirement.
≠IS 15477 is prescriptive in its title, focusing on 'Acrylic based cementitious composite coatings', whereas EN 14891 and AS/NZS 4858 are performance-based and material-agnostic, covering various chemistries.
≠IS 15477 includes a requirement for Rapid Chloride Permeability (RCPT), indicating a focus on concrete protection in corrosive environments, which is not a standard requirement in EN 14891 or AS/NZS 4858.
Key Similarities
≈All standards are product specifications for liquid-applied waterproofing membranes intended for concrete and masonry substrates.
≈They all mandate critical performance tests including water impermeability, tensile adhesion strength (bond strength), and crack bridging capability.
≈The testing methodologies in all standards require specimen conditioning to simulate real-world exposure, such as standard curing, heat ageing, and full water immersion.
≈The fundamental purpose across all standards is to ensure the creation of a seamless, monolithic membrane that prevents water penetration into the substrate.
Parameter Comparison
Parameter
IS Value
International
Source
Tensile Adhesion Strength (after water immersion)
≥ 1.0 N/mm² (MPa)
≥ 0.5 N/mm² (MPa)
EN 14891:2017
Crack Bridging Ability (at standard temp)
No rupture at 0.5 mm crack width
≥ 0.75 mm (for crack bridging class CM O P)
EN 14891:2017
Water Impermeability Test Pressure
5.0 bar (approx. 50m head) for 7 days
1.5 bar (approx. 15m head) for 7 days
EN 14891:2017
Elongation at Break
Not specified as a mandatory value.
≥ 150% (Class II) / ≥ 300% (Class III)
AS/NZS 4858:2004
Water Vapour Transmission
< 30 g/m²/24h
Varies; often specified as Sd value < 5 m (equivalent to ~3 g/m²/24h for a 1mm film), making the IS limit less strict.
Typical requirement for EN 14891 compliant products
Rapid Chloride Permeability Test (RCPT)
< 1000 Coulombs (Low Permeability)
Not a standard requirement.
EN 14891:2017 / AS/NZS 4858:2004
⚠ Verify details from original standards before use
Key Values6
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
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements of Acrylic based Cementitious Composite Coatings
Key Clauses
Clause 4 - Materials
Clause 5 - Physical Requirements
Clause 6 - Tests
Annex A - Method for Determination of Water Permeability