What is the standard thickness for these corrugated sheets?

The nominal thickness is 6 mm, with a tolerance of ± 0.5 mm (Clause 4.1).

What is the minimum breaking strength I should look for?

For standard Class A corrugated sheets, the minimum breaking load is 4000 N/m width in the strongest direction (Table 3).

Are these sheets waterproof?

They must pass a water tightness test without leakage, but the material itself has a maximum water absorption limit of 28% by mass (Table 3).

What kind of fibres are used?

The standard specifies the use of suitable man-made fibres, such as Polyvinyl Alcohol (PVA), as reinforcement (Clause 3.2).

IS 12592

: 1988

Fibre reinforced concrete (FRC) roofing sheets

CurrentSpecializedSpecificationBIMMaterials Science · Roofing Materials

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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.

Quick Reference Values

Nominal thickness of corrugated sheets6 mm

Minimum breaking load for Class A corrugated sheets (strongest direction)4000 N/m width

Minimum breaking load for Class A corrugated sheets (weakest direction)3500 N/m width

Maximum water absorption28 % by mass

Maximum apparent density1.6 g/cm³

Standard pitch of corrugations146 mm

Practical Notes

This code was developed as a direct, non-asbestos replacement for traditional asbestos cement (AC) sheets.

The transverse breaking load is the most critical performance parameter; ensure sheets have the ISI mark certifying compliance.

Handle sheets with care during transport and installation to avoid brittle failure or cracking at fixing points.