What is the minimum standard thickness for a corrugated bitumen sheet?

The minimum thickness is 2.5 mm as per Table 1.

What is the maximum allowed mass for these sheets?

The mass shall not exceed 3.5 kg/m² according to Table 1.

What is the test for heat resistance?

The sheet should show no signs of blistering or exudation of bitumen when kept at 70°C for 2 hours (as per Clause 6.4 and Table 2).

What is the maximum water absorption allowed?

The water absorption should not exceed 2.0 percent by mass after 24 hours of immersion in water (Table 2).

IS 12583

: 1988

corrugated bitumen roofing sheets

CurrentSpecializedSpecificationBIMMaterials Science · Flooring, Wall Finishing and Roofing

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This standard specifies the requirements for corrugated bitumen sheets intended for use as roofing and cladding. It covers the materials, dimensions, physical properties such as water absorption and heat resistance, and the tests to verify these properties.

corrugated bitumen roofing sheets

Quick Reference Values

Minimum thickness2.5 mm

Maximum mass3.5 kg/m²

Pitch of corrugations95 ± 2 mm

Depth of corrugations35 ± 2 mm

Maximum water absorption (24h)2.0 % by mass

Heat resistance test temperature70 ± 2 °C

Minimum breaking load (transverse)500 N

Practical Notes

These sheets are lightweight and easy to install, making them a common choice for sheds, agricultural structures, and low-cost housing projects.

Ensure correct side and end laps as per manufacturer specifications during installation to prevent water leakage.

The material is not meant to bear significant foot traffic and can become brittle in very low temperatures.