What is the difference between Class B and Class C sheets?

Class C sheets have a higher minimum breaking load requirement (2500 N/m) compared to Class B sheets (1500 N/m), making them stronger. See Table 2.

Does this standard cover asbestos cement (AC) sheets?

No, this standard is specifically for products manufactured with fibres other than asbestos. It supersedes the old standards for AC sheets.

What are the main tests required for these sheets?

The key performance tests are the breaking load test, water permeability test, and water absorption test as detailed in Clause 8.

What is the standard tolerance for the length of a corrugated sheet?

The tolerance on the ordered length is ± 5 mm, as per Clause 6.1.1.

IS 14871

: 2000

Products in Fibre Reinforced Cement - Long Corrugated or Asymmetrical Section Sheets and Fittings for Roofing and Cladding

CurrentSpecializedSpecificationBIMMaterials Science · Cement Matrix Products

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This standard specifies the requirements for non-asbestos fibre-reinforced cement corrugated sheets and associated fittings intended for roofing and cladding. It outlines the materials, dimensions, physical performance criteria such as breaking load and water permeability, and the test methods for verification.

Products in Fibre Reinforced Cement - Long Corrugated or Asymmetrical Section Sheets and Fittings for Roofing and Cladding

Quick Reference Values

Nominal thickness6 mm

Tolerance on thickness±0.6 mm

Minimum breaking load (Class B sheet)1500 N/m width

Minimum breaking load (Class C sheet)2500 N/m width

Maximum water absorption (by mass)28 %

Standard pitch of corrugation146 mm

Standard depth of corrugation48 mm

Practical Notes

This code is for NON-ASBESTOS fibre cement products, which have superseded the older asbestos-based sheets (e.g., IS 2096).

Sheets are brittle and must be handled with care during transportation and installation to avoid cracks and breakage.

Verify the marking on each sheet as per Clause 9 to ensure compliance with the specified class (e.g., Class B, Class C) and for traceability.