What are the standard dimensions of a roll of bitumen felt as per IS 7193?

A standard roll is 1 meter wide and 20 meters long, as specified in Table 1.

What is the key difference between Type 1 and Type 2 felt?

Type 2 felt has a higher breaking strength requirement (350 N/50mm) and is intended for roofing, while Type 1 (200 N/50mm) is for general damp-proofing and tanking (Clause 3 and Table 2).

How is the flexibility or pliability of the felt checked?

The pliability test involves bending a sample around a 20 mm diameter mandrel at a specified low temperature (e.g., 10°C). The sample should not show any cracks (Clause 7.5).

What are the surfacing materials used on these felts?

Surfacing materials can be mineral powder (like talc), sand, or polyethylene film to prevent layers from sticking together in the roll (Clause 4.4).

IS 7193

: 2013

glass fibre base bitumen felts

CurrentSpecializedSpecificationMaterials Science · Waterproofing and Damp-Proofing

Download PDF BIS Portal Google

This standard specifies the requirements for glass fibre base bitumen felts intended for use in waterproofing and damp-proofing. It covers the classification, materials, manufacture, dimensions, physical properties like strength and pliability, and test methods. The felts are categorized into types and grades for different applications such as roofing, tanking, and damp-proof courses.

glass fibre base bitumen felts

Quick Reference Values

Standard roll width1000 mm (±1%)

Standard roll length20 m (±1%)

Pliability test mandrel diameter20 mm

Min breaking strength (longitudinal, Type 1)200 N/50 mm

Min breaking strength (longitudinal, Type 2)350 N/50 mm

Max water absorption1.0 percent by mass

Heat resistance test temperature85 ± 2 °C

Practical Notes

Type 2 felts are generally used for roofing applications, while Type 1 is for tanking and damp-proofing. Always verify the type specified matches the intended use.

Ensure rolls are stored vertically on-site and protected from direct sunlight and physical damage to maintain material integrity.

Look for the BIS certification mark (ISI Mark) on the product packaging as a primary check for quality compliance.