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IS 7193:1994 is the Indian Standard (BIS) for glass fibre base bitumen felts. This standard specifies the requirements for glass fibre base bitumen felts used for waterproofing and damp-proofing. It covers material composition, manufacturing, dimensions, physical properties such as breaking strength and water absorption, and methods of sampling and testing for different types and grades.
glass fibre base bitumen felts
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp-Proofing
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The standard covers two types: Type 1 (self-finished) and Type 2 (mineral granule surfaced). Choose Type 2 for surfaces exposed to UV and light foot traffic.
! Ensure proper surface preparation, including cleaning and priming with a suitable bitumen primer as per IS 1580, before applying the felt.
! Lapping is critical for performance. Adhere to specified side laps (typically 75 mm) and end laps (100 mm) using hot bitumen or cold adhesive.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
bitumenglass fibrewaterproofing feltmembrane
International Equivalents
Similar International Standards
ASTM D2178-15a(2020)ASTM International, USA
HighCurrent
Standard Specification for Asphalt Glass Felt Used in Roofing and Waterproofing
Specifies asphalt-saturated glass felts, composed of glass-fiber mats, for use in built-up roofing and waterproofing.
EN 13707:2013CEN (European Committee for Standardization), Europe
MediumCurrent
Flexible sheets for waterproofing - Reinforced bitumen sheets for roof waterproofing - Definitions and characteristics
Covers reinforced bitumen sheets for roof waterproofing, including glass fibre reinforced types, but is performance-based.
ASTM D4601-04(2018)ASTM International, USA
HighCurrent
Standard Specification for Asphalt-Coated Glass-Fiber Base Sheet Used in Roofing
Specifies asphalt-coated glass fiber base sheets for use as the first ply in multi-ply built-up roof membranes.
BS 747:2000BSI (British Standards Institution), UK
HighWithdrawn
Reinforced bitumen sheets for roofing. Specification
Formerly specified requirements for bitumen sheets with various reinforcements, including glass fibre (Type 3 felts).
Key Differences
≠IS 7193 is largely prescriptive, specifying the mass of constituents like base felt and saturant, whereas modern standards like EN 13707 are performance-based, focusing on the final product's characteristics (e.g., tensile strength, watertightness) regardless of composition.
≠Product classification differs significantly. IS 7193 defines two types based on finish (self-finished or mineral-surfaced). ASTM D2178 classifies four types based on physical properties, while EN 13707 uses a complex system based on application and performance levels.
≠Test conditions for key parameters vary. For example, the Pliability test in IS 7193 is conducted at 10°C, while in ASTM D2178 it is conducted at a less stringent 25°C (77°F).
≠Requirements for heat resistance are different. IS 7193 specifies a maximum flow of 5 mm at 85°C, whereas ASTM D4601 requires no flowing or sagging at a higher temperature of 105°C.
Key Similarities
≈All standards are based on the same core product composition: a non-woven glass fibre mat used as a reinforcement base, which is then saturated and/or coated with bitumen (asphalt).
≈The primary intended application across all standards is for the waterproofing of roofs and other structures, typically as a component in a multi-layer or built-up system.
≈A common set of fundamental physical properties are evaluated, including breaking/tensile strength, pliability at low temperatures, heat resistance, and water impermeability, even though test methods and required values may differ.
≈All standards specify requirements for mass per unit area and roll dimensions (width and length) to ensure product consistency for design, procurement, and installation purposes.
Parameter Comparison
Parameter
IS Value
International
Source
Breaking Strength (Longitudinal)
Min 350 N/50 mm width (for Type 2, Grade 1)
Min 312 N/50 mm width (156 N/25 mm)
ASTM D4601 (Type II)
Pliability Test
No cracking over 25 mm mandrel at 10°C
No cracking over 19 mm mandrel at 25°C
ASTM D2178 (Type IV)
Heat Resistance (Flow Test)
Max 5 mm flow at 85°C
No flowing, sagging, or blistering at 105°C
ASTM D4601
Mass of Desaturated Base Felt
Min 60 g/m² (for Type 2, Grade 1)
Min 83 g/m²
ASTM D2178 (Type IV)
Water Absorption (by mass)
Max 1.0% (24h immersion)
No direct equivalent; ASTM specifies max 1.0% 'Mass of Moisture' in the finished product as delivered.
ASTM D2178
Mass per Unit Area
Min 3.0 kg/m² (for Type 2, Grade 1)
Min 2.44 kg/m²
ASTM D4601 (Type II)
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Standard Roll Width1 m
Standard Roll Length10 m or 20 m
Breaking Strength (min, Type 2, Grade 1)350 N / 50 mm width
Pliability Test Temperature0 °C (no cracking)
Heat Resistance Test Temperature85 °C (no flow or blistering)
Water Absorption (max)1.0 % by mass
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements of Glass Fibre Base Bitumen Felts
Table 2 - Scale of Sampling and Criteria for Conformity