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IS 15476:2004 is the Indian Standard (BIS) for bamboo mat corrugated sheets -specification. This standard specifies the requirements for manufacturing, dimensions, and physical/mechanical properties of corrugated roofing sheets made from bamboo mats bonded with resin. It covers material quality, performance tests, and marking for a sustainable and eco-friendly building material primarily used in roofing and cladding.
Bamboo Mat Corrugated Sheets -Specification
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Wood and Other Lignocellulosic Products
ISO 9933:2015ISO (International Organization for Standardization), Global
MediumCurrent
Fibre-cement profiled sheets and fittings — Product specification and test methods
Covers corrugated sheets for roofing, but made from fibre-cement instead of bamboo composite.
EN 534:2006+A1:2010CEN (European Committee for Standardization), Europe
MediumCurrent
Corrugated bitumen sheets and fittings - Product specification and test methods
Specifies corrugated sheets for roofing with a similar form factor, but based on bitumen-impregnated cellulose fibres.
ISO 12872:2016ISO (International Organization for Standardization), Global
LowCurrent
Laminated bamboo for indoor furniture purposes — General requirements
Pertains to a bamboo composite (laminated), but for flat panels and indoor furniture, not corrugated roofing.
ISO 22157:2019ISO (International Organization for Standardization), Global
LowCurrent
Bamboo — Determination of physical and mechanical properties
Provides test methods for the raw bamboo material, not the final composite sheet product.
Key Differences
≠Primary Constituent Material: IS 15476 specifies sheets made from woven bamboo mats bonded with thermosetting resin (Phenol Formaldehyde), whereas comparable standards like ISO 9933 specify a composite of cement, reinforcing fibres (like PVA), and additives.
≠Density and Weight: Bamboo mat corrugated sheets are significantly lighter (density ≥ 900 kg/m³) than fibre-cement sheets (density ≥ 1200-1400 kg/m³), which has major implications for structural support requirements and handling.
≠Mechanical Behavior: Bamboo mat sheets are more flexible and less brittle. Their failure mode is typically tearing or delamination, whereas fibre-cement sheets exhibit a more brittle fracture.
≠Manufacturing Process: The IS standard product is made by impregnating bamboo mats with resin and hot-pressing them in a corrugated mould. Fibre-cement sheets are typically made using the Hatschek process (forming a slurry on a felt band) or flow-on process, followed by curing (air or autoclave).
Key Similarities
≈Product Form and Application: Both IS 15476 and international counterparts like ISO 9933 specify products with a corrugated profile intended for use as roofing and wall cladding.
≈Performance-Based Testing: Both standards mandate crucial performance tests relevant to roofing, such as transverse load-bearing capacity and water resistance, to ensure fitness for purpose.
≈Geometric Specifications: The standards define and control key geometric parameters of the sheets, including length, width, thickness, and the pitch and depth of corrugations, with specified tolerances.
≈Quality Control and Marking: Both include requirements for visual inspection to limit defects (e.g., blisters, cracks) and mandatory marking of the product for traceability and certification.
Parameter Comparison
Parameter
IS Value
International
Source
Density
Not less than 900 kg/m³
Not less than 1200 kg/m³ (For Autoclaved, Category C)
ISO 9933:2015
Transverse Load Bearing Capacity
Minimum load of 2000 N/m width on a 1m span without failure.
Minimum bending moment of 40 Nm/m for Category C, Class 1 sheets.
ISO 9933:2015
Water Resistance Test
Water absorption not to exceed 20% after 24-hour immersion.
Sheet must be watertight (no formation of water drops on underside) under a static head of water.
ISO 9933:2015
Impact Resistance
No cracking or perforation when a 1 kg steel ball is dropped from 1.5 m.
Typically tested for soft body impact (e.g., a 40 kg sandbag) to ensure worker safety, not hard body impact.
ISO 9933:2015
Nominal Thickness Tolerance
± 10%
± 10% of nominal thickness (for thickness > 6mm)
ISO 9933:2015
Pitch of Corrugation
75 mm (± 2 mm)
Profiles vary, e.g., 177 mm or 130 mm are common, but not fixed by the standard.
ISO 9933:2015 / EN 494
Resin Type
Phenol Formaldehyde (PF) resin, conforming to IS 848.
Not applicable; binder is Portland cement.
ISO 9933:2015
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum Density1.0 g/cm³
Maximum Water Absorption (24h)20 % by mass
Minimum Tensile Strength (Parallel to corrugation)35 N/mm²
Minimum Flexural Strength (Parallel to corrugation)50 N/mm²
Impact Strength (Falling Ball Test)No visible crack from 1 kg ball at 1 m height
Boiling Water ResistanceNo delamination after 2 hours
Tables & Referenced Sections
Key Tables
Table 1 - Physical and Mechanical Properties of Bamboo Mat Corrugated Sheets
Table 2 - Dimensional Tolerances for Bamboo Mat Corrugated Sheets
Key Clauses
Clause 4 - Materials
Clause 5 - Requirements (Dimensions, Physical and Mechanical)
What is the maximum water absorption allowed for these sheets?+
The maximum water absorption is 20 percent by mass after 24 hours of immersion in water at 27±2°C (Table 1).
What is the standard width of a bamboo mat corrugated sheet?+
The standard width is 1050 mm, with a tolerance of ±5 mm (Clause 5.1.1).
Are these sheets fire resistant?+
The standard states that fire-retardant chemicals may be added during manufacture to improve fire resistance, but does not mandate a specific fire rating. Performance depends on the specific treatment used.
What is the test for impact resistance?+
A 1 kg steel ball is dropped from a height of 1 m onto the sheet. The sheet passes the test if there is no visible crack or damage on the surface (Annex C).