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IS 1345:1982 is the Indian Standard (BIS) for bitumen mastic for waterproofing - specification. This standard specifies the composition, preparation methods, and physical properties of bitumen mastic used for waterproofing and damp-proofing in structural elements like roofs, basements, and swimming pools.
Specifies requirements for bitumen mastic used as a waterproofing material, primarily for roofs and floors.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp Proofing
! Ensure the concrete or masonry substrate is thoroughly completely dry and primed with an appropriate bitumen primer before laying the mastic to prevent blistering and debonding.
! Bitumen mastic must be laid hot (typically 180°C to 200°C) using wooden floats; continuous stirring in the mastic cooker is critical to avoid localized overheating and segregation of aggregates.
! Avoid applying bitumen mastic directly over joints in the structural deck without proper isolation or joint detailing, to prevent cracking of the mastic layer.
BS EN 13108-6:2016+A1:2019BSI / CEN, United Kingdom / Europe
HighCurrent
Bituminous mixtures - Material specifications - Part 6: Mastic Asphalt
Specifies requirements for mastic asphalt mixtures used for construction, including waterproofing layers.
BS EN 12970:2000BSI / CEN, United Kingdom / Europe
HighWithdrawn
Mastic asphalt for waterproofing - Definitions, requirements and test methods
Directly addressed mastic asphalt specifically for waterproofing, making it a very close historical equivalent.
BS 6925:1988BSI, United Kingdom
HighWithdrawn
Specification for mastic asphalt for building and civil engineering (limestone aggregate)
Covered hot-applied mastic asphalt for building applications like roofing, tanking, and flooring.
ASTM D491-79ASTM International, USA
MediumWithdrawn
Standard Specification for Asphalt Mastic for Use in Waterproofing
Specified asphalt mastic for waterproofing but used different test methodologies and component definitions.
Key Differences
≠IS 1345 specifies a unique 'Hardness Number' test (value 8-20 at 25°C), while European standards (EN 13108-6) use indentation depth (mm) at specified temperatures (e.g., 40°C), and the withdrawn ASTM D491 used the standard penetration test (dmm).
≠Modern European standards are modular; BS EN 13108-6 specifies the material but extensively references other EN standards for test methods (e.g., EN 12697 series). IS 1345 is a self-contained document with test procedures described within.
≠Binder specification in IS 1345 refers to specific Indian industrial bitumen grades (e.g., 10/20). EN standards allow for a wider range of binders, including polymer-modified bitumen (PMB), specified by performance properties under standards like EN 12591 and EN 14023.
≠The heat stability test in IS 1345 requires stability for 6 hours at 200°C, a test of application conditions. ASTM D491 focused on a 5-hour test at a lower temperature (163°C) and included a mass loss requirement, a different approach to stability assessment.
Key Similarities
≈All standards define the material as a dense, essentially voidless, hot-applied mixture of bitumen binder and graded mineral aggregates (filler, fine, and coarse).
≈The primary purpose across all standards is to create a monolithic, impermeable layer for waterproofing applications in building and civil engineering structures.
≈All standards specify a high bitumen binder content, typically in the range of 14-18%, which is crucial for achieving the voidless and flexible nature of mastic asphalt.
≈A key performance requirement in all standards is resistance to indentation or hardness at ambient service temperatures and stability at high application temperatures to prevent flow or degradation.
Parameter Comparison
Parameter
IS Value
International
Source
Binder Content (% by mass)
14.0% to 18.0%
13.0% to 17.0% (for Type R, waterproofing)
BS 6925:1988
Hardness (Indentation Resistance)
8 to 20 (Hardness Number at 25°C)
10 to 25 dmm (Penetration at 25°C, 100g, 5s)
ASTM D491-79
Mineral Filler (% passing 75μm sieve)
20% to 40% of total mineral matter
12% to 32% of total aggregate
ASTM D491-79
Heat Stability
No foaming or slipping after 6 hrs at 200°C
No blistering or segregation after 2 hrs at application temp.
BS EN 12970:2000
Coarse Aggregate Max Size
All passing 22.4 mm sieve
Max. nominal size of aggregate D=11mm or D=16mm
BS EN 13108-6
Aggregate Type
Limestone or other suitable non-friable rock
Primarily limestone aggregate
BS 6925:1988
⚠ Verify details from original standards before use
Key Values4
Quick Reference Values
Soluble bitumen content14 to 17 percent by mass
Maximum heating temperature200 °C
Hardness number at 25°C10 to 20
Ash content of mineral fillerNot less than 70 percent