Similar International Standards
ASTM D226 / D226M-17ASTM International, USA
HighCurrent
Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing
Covers asphalt-saturated organic felt for waterproofing, a material compositionally very similar to IS 3093's product.
BS EN 13707:2013BSI / CEN, UK / Europe
MediumCurrent
Flexible sheets for waterproofing - Reinforced bitumen sheets for roof waterproofing - Definitions and characteristics
Modern European standard for reinforced bitumen sheets for waterproofing, the technological successor to older felt standards.
ASTM D2178 / D2178M-15aASTM International, USA
MediumCurrent
Standard Specification for Asphalt Glass Felt Used in Roofing and Waterproofing
Similar application but specifies a glass felt base, whereas IS 3093 allows for various bases including jute and hair.
BS 747:2000BSI, UK
HighWithdrawn
Reinforced bitumen sheets for roofing. Specification
The direct predecessor to the current EN standard and a close historical equivalent to the IS code's scope and technology.
Key Differences
≠Primary Application Focus: IS 3093 is explicitly for 'thermal insulation', including a thermal conductivity requirement. Most international equivalents (e.g., ASTM D226, BS EN 13707) are for 'waterproofing', with thermal performance handled by other layers in a modern assembly.
≠Base Material (Carrier): IS 3093 permits traditional base materials like jute hessian and hair felt. Modern international standards typically specify more engineered carriers like glass fibre, polyester (BS EN 13707), or wood-cellulose 'organic felt' (ASTM D226).
≠Prescriptive vs. Performance-Based: IS 3093 is highly prescriptive, defining the exact composition (e.g., mass of bitumen per area). Modern standards like BS EN 13707 are performance-based, defining classes for properties like tensile strength and flexibility, allowing for manufacturing innovation.
≠Surface Finish: IS 3093 specifies mica or a similar powder as a dusting agent. International standards cover a wider range of finishes, including mineral granules, sand, and polymer films, suited for different applications (e.g., UV protection on cap sheets).
Key Similarities
≈Fundamental Composition: All standards describe a composite material based on the same principle: a carrier/felt saturated and coated with bitumen (asphalt) to make it water-resistant and durable.
≈Key Physical Tests: Core mechanical tests are conceptually similar across the standards, including tensile/breaking strength to assess durability during application and pliability/flexibility to ensure the material does not crack when bent.
≈Mass per Unit Area: The weight or mass per unit area of the finished felt is a critical quality control parameter in both the Indian standard and its international counterparts, as it directly relates to the amount of bitumen applied.
≈Water Impermeability: Although the test methods may differ (e.g., water absorption % vs. watertightness under pressure), the fundamental requirement for the material to be impervious to water is a shared and primary objective.