What are the main fastener types covered by IS 15089?

Self-drilling and self-tapping screws, typically with hexagon heads, made from carbon steel or stainless steel.

What does a 'Class 3' fastener signify?

It refers to a carbon steel fastener with a minimum zinc coating of 12 µm, required to withstand a 240-hour neutral salt spray test, making it suitable for moderate corrosive environments (Table 4).

What are the requirements for the sealing washer?

The washer is typically a composite of a metal backing (aluminium or steel) and a sealing element made of EPDM, as specified in Annex B, to ensure a durable, weather-tight seal.

How is the drilling capability of a self-drilling screw tested?

The test measures the time taken for the screw to fully drill through a steel plate of specified thickness under a fixed load. For example, it must penetrate a 1.6 mm plate in under 4 seconds (Clause 7.5).

IS 15089

: 2001

Fasteners for roofing and cladding applications

CurrentFrequently UsedSpecificationBIMMaterials Science · Roofing Materials

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This standard specifies the requirements for self-drilling and self-tapping fasteners used for fixing roofing and cladding systems. It covers materials, dimensions, mechanical properties, performance criteria like corrosion resistance (salt spray test), and testing procedures for both carbon steel and stainless steel fasteners.

Specifies requirements for fasteners used in roofing and cladding applications.

Quick Reference Values

Minimum Core Hardness (Carbon Steel)320 to 400 HV

Minimum Surface Hardness (Carbon Steel)560 HV

Maximum Drilling Time (1.6 mm thick steel)4 seconds

Minimum Salt Spray Resistance (Class 3)240 hours

Minimum Salt Spray Resistance (Class 4)1000 hours

Minimum Zinc Coating Thickness (Class 3)12 µm

Practical Notes

Ensure the EPDM washer is properly compressed during installation; over-tightening can damage the washer and lead to leaks, while under-tightening will not create a weather-tight seal.

Always match the fastener's corrosion resistance class (e.g., Class 3 for moderate, Class 4 for severe environments) to the project's location and the lifespan of the cladding material.

On-site, verify the manufacturer's markings on the fastener head to ensure it matches the specified type and class as per project specifications and Clause 11 of the standard.