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IS 3037:1986 is the Indian Standard (BIS) for bitumen mastic for use in water-proofing of roofs. This standard specifies the material requirements, manufacturing process, and physical properties (such as hardness number and bitumen content) of bitumen mastic used for waterproofing of building roofs.
bitumen mastic for use in water-proofing of roofs
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp-Proofing
! Mastic must be heated slowly and continuously agitated to prevent local overheating and degradation of the bitumen.
! IS 3037 specifies the material manufacturing; for site application procedures, engineers must refer to IS 4365.
! Proper grading of the fine aggregate and filler is essential to achieve the specified hardness number and prevent the mastic from flowing under solar heat.
BS 6925:1988BSI (British Standards Institution), United Kingdom
HighWithdrawn
Specification for mastic asphalt for building and civil engineering (limestone aggregate)
Covers hot-applied mastic asphalt for various uses, including a specific grade for roofing.
ASTM D491-92(2012)ASTM International, United States
HighWithdrawn
Standard Specification for Asphalt Mastic for Use in Waterproofing
Specifies hot-applied asphalt mastic composed of binder, filler, and aggregate for waterproofing.
BS EN 12970:2000CEN (European Committee for Standardization), adopted by BSI in UK
HighWithdrawn
Mastic asphalt for waterproofing - Definitions, requirements and test methods
A harmonized European standard for mastic asphalt specifically for waterproofing applications.
DIN 18531 (Series)DIN (Deutsches Institut für Normung), Germany
MediumCurrent
Waterproofing for roofs and for balconies, loggias and walkways
A code of practice for roof waterproofing systems; references material standards like EN 12970.
Key Differences
≠IS 3037 specifies a much higher binder content (30-45%) compared to international counterparts like ASTM D491 (12-30%), resulting in a 'richer' and potentially more flexible mastic.
≠IS 3037 provides two distinct grades (Grade 1 & 2) based on ambient application temperature, a feature not commonly found in international standards which tend to grade by application type (e.g., roofing, paving).
≠The base bitumen specified for use in IS 3037 (referencing IS 73) is significantly softer (e.g., S90 grade with 80-100 penetration) than the binder required by standards like ASTM D491 (15-40 penetration).
≠Hardness test conditions differ; IS 3037 specifies testing at 25°C, while BS 6925 specifies 20°C for its roofing grade, reflecting different standard laboratory temperatures and intended service climates.
Key Similarities
≈All standards define the material's fundamental composition as a hot-applied mixture of a bituminous binder, mineral filler, and fine aggregate.
≈The use of an indentation or hardness test is a common and critical requirement across all standards to measure the mastic's resistance to penetration and suitability for service loads.
≈All standards are intended for creating a monolithic, voidless, and impermeable layer for the purpose of waterproofing horizontal or gently sloped surfaces, primarily roofs.
≈Control of mineral and binder content is a key aspect of all specifications, as this ratio dictates the final properties of the mastic, such as flow, hardness, and durability.
Parameter Comparison
Parameter
IS Value
International
Source
Binder Content (% by mass)
30 - 45%
12 - 30%
ASTM D491
Total Mineral Matter Content (% by mass)
55 - 70%
70 - 88%
ASTM D491
Hardness Number (Grade 1)
8 - 25 (at 25°C, 50 kgf load)
50 - 90 (at 20°C, 100 kg load)
BS 6925 (Type R988)
Penetration of Recovered Binder (at 25°C, 100g, 5s, 0.1mm)
Typically 80-100 (references IS 73, S90 grade)
15 - 40
ASTM D491
Softening Point of Recovered Binder (°C)
Typically 40-55 (references IS 73, S90 grade)
43 - 60
ASTM D491
Ductility of Recovered Binder (at 25°C, cm)
Min 75 (references IS 73 at 27°C)
Min 15
ASTM D491
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Hardness Number at 25°C30 to 60
Bitumen Content (Minimum)14% to 17% by mass depending on formulation