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IS 12592:1988 is the Indian Standard (BIS) for fibre reinforced concrete (frc) roofing sheets. This standard specifies the requirements for man-made fibre reinforced cement sheets, in both corrugated and semi-corrugated profiles. It covers material composition, dimensions, tolerances, and physical requirements such as breaking load and water absorption, intended as a non-asbestos alternative for roofing and cladding.
Specifies requirements for fibre reinforced concrete (FRC) roofing sheets.
EN 494:2012+A1:2015CEN (European Committee for Standardization), Europe
HighCurrent
Fibre-cement corrugated sheets and fittings for roofing - Product specification and test methods
Directly corresponds to corrugated fibre-cement roofing sheets, specifying geometry, mechanical characteristics, and tests.
ASTM C1186 - 19ASTM International, USA
MediumCurrent
Standard Specification for Flat Fiber-Cement Sheets
Covers fibre-cement sheets but focuses on flat sheets for various applications, not specifically corrugated roofing.
EN 12467:2012+A2:2018CEN (European Committee for Standardization), Europe
MediumCurrent
Fibre-cement flat sheets - Product specification and test methods
Specifies requirements for flat fibre-cement sheets, sharing material technology but differing in product form (flat vs. corrugated).
AS/NZS 2908.2:2000Standards Australia / Standards New Zealand, Australia/New Zealand
LowCurrent
Cellulose-cement products, Part 2: Flat sheets
Covers flat sheets and is specific to cellulose fibre reinforcement, whereas IS 12592 is broader in fibre types.
Key Differences
≠IS 12592:1988 is a significantly older standard and lacks the comprehensive durability testing requirements (e.g., freeze-thaw cycles, heat-rain tests) mandated in modern standards like EN 494 for certain product types.
≠EN 494 specifies different performance classes for breaking load and density, allowing for a range of products. IS 12592 provides a single set of minimum requirements, offering less differentiation.
≠The method for specifying flexural strength differs. IS 12592 specifies a minimum breaking load per unit width (N/m), whereas EN 494 specifies a minimum breaking moment per unit width (N·m/m), which accounts for different test spans.
≠IS 12592 broadly includes a variety of fibres like steel, glass, and polypropylene. Modern equivalents like EN 494 are implicitly focused on synthetic organic (e.g., PVA) and cellulose fibres used in current asbestos-free production.
Key Similarities
≈The fundamental purpose of all standards is to define the quality, dimensions, and performance characteristics of fibre-reinforced cementitious sheets for roofing applications.
≈The primary mechanical strength requirement in both IS 12592 and its international equivalents is determined by a transverse bending/flexural strength test.
≈All standards include a mandatory water impermeability or water tightness test to ensure the roofing sheets do not allow water to pass through them.
≈Both the Indian and international standards specify requirements and tolerances for key geometric properties such as length, width, thickness, and corrugation profile.
Parameter Comparison
Parameter
IS Value
International
Source
Flexural Strength Test Method
Minimum average breaking load of 1500 N/m width, tested over a 500 mm span.
Specified as a breaking moment, e.g., Min 40 N·m/m (Class 1). Test span varies by profile (e.g., 1100 mm).
EN 494:2012+A1:2015
Water Tightness
After 24 hours under a head of water, no formation of water drops on the underside.
After 24 hours, the underside of the test specimen shall show no signs of formation of water drops.