Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 14777:2000 is the Indian Standard (BIS) for bitumen membrane for waterproofing (modified bitumen membranes). This standard specifies the requirements for factory-manufactured polymer modified bitumen waterproofing membranes. It covers membranes reinforced with polyester (Type 1) or glass fibre (Type 2), detailing material properties, physical requirements like tensile strength and flexibility, and prescribed testing methods.
Specifies requirements for modified bitumen membranes for waterproofing applications.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! APP modified membranes are generally preferred for high temperature and UV exposed areas like roofs, while SBS membranes offer better flexibility for areas with structural movement or in cold climates.
! Proper surface preparation, including the application of a compatible bitumen primer, is critical for achieving a monolithic and effective waterproofing system.
! Ensure membrane thickness is specified and verified as per project requirements (e.g., 3mm or 4mm), as this standard covers properties but not application-specific thickness selection.
Standard Specification for Atactic Polypropylene (APP) Modified Bituminous Sheet Materials Using Polyester Reinforcements
Covers factory-fabricated APP modified bituminous sheets with polyester reinforcement, analogous to IS 14777 Type A.
ASTM D6164/D6164M-20ASTM International, USA
HighCurrent
Standard Specification for Styrene-Butadiene-Styrene (SBS) Modified Bituminous Sheet Materials Using Polyester Reinforcements
Covers factory-fabricated SBS modified bituminous sheets, a primary modifier type also covered by IS 14777.
EN 13707:2013CEN (European Committee for Standardization), Europe
HighCurrent
Flexible sheets for waterproofing - Reinforced bitumen sheets for roof waterproofing - Definitions and characteristics
Harmonized European standard for reinforced bituminous sheets for roof waterproofing, covering similar product types.
ASTM D6163/D6163M-20ASTM International, USA
HighCurrent
Standard Specification for Styrene-Butadiene-Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber Reinforcements
Covers SBS modified sheets with glass fiber reinforcement, analogous to IS 14777 Type B materials.
Key Differences
≠IS 14777 classifies membranes primarily by reinforcement type (Type A - Polyester, Type B - Glass Fibre) and thickness, whereas ASTM has separate standards for each combination of modifier (APP/SBS) and reinforcement.
≠IS 14777 mandates a specific water absorption test (max 1% by mass), which is not a standard requirement in ASTM or EN standards, which focus more on water vapour permeability and hydrostatic pressure resistance.
≠The Indian standard specifies a minimum softening point (e.g., ≥150°C for APP). In contrast, ASTM standards specify performance at high temperatures via a 'flow resistance' test at a set temperature (e.g., 121°C), rather than determining the compound's softening point.
≠EN 13707 operates on a system of 'declared values' by the manufacturer for many parameters (e.g., thickness, cold flexibility), which are then verified, offering more product variety. IS 14777 sets fixed minimum values for specific grades and types.
Key Similarities
≈All standards cover composite membranes consisting of a bitumen-based compound modified with thermoplastic polymers like APP (Atactic Polypropylene) or elastomers like SBS (Styrene-Butadiene-Styrene).
≈The use of non-woven spun-bond polyester fabric and glass fibre mats as the central reinforcement core is a common feature across IS, ASTM, and EN specifications.
≈All standards mandate a similar range of performance tests to ensure product quality, including tensile strength, elongation, tear resistance, and water impermeability (hydrostatic pressure).
≈The intended application for products under all these standards is the waterproofing of civil engineering structures, with a primary focus on roofing and, in many cases, below-grade structures like basements and foundations.
Parameter Comparison
Parameter
IS Value
International
Source
Tensile Strength (Longitudinal)
≥ 650 N/50mm (for Type A, Polyester)
≥ 1750 N/50mm (equivalent to ≥ 200 lbf/in for Type I)
ASTM D6222-21
Elongation at Break (Longitudinal)
≥ 30% (for Type A, Polyester)
≥ 25% (at peak load)
ASTM D6222-21
Tear Resistance (Nail Shank)
≥ 250 N (for Type A, Polyester)
≥ 156 N (equivalent to ≥ 35 lbf)
ASTM D6222-21
Low Temperature Flexibility
No cracks at 0°C (for APP, Grade P)
No cracks at 0°C (32°F)
ASTM D6222-21
Softening Point (R&B)
≥ 150 °C (for APP modified)
Not specified as a sheet property; a 'flow resistance' test is used instead (e.g., no flow at 121°C).
ASTM D6222-21
Water Absorption (24h immersion)
≤ 1.0 % by mass
Not specified
ASTM D6222-21
Water Pressure Resistance
No leakage at 0.1 MPa (1 kgf/cm²)
No leakage at 345 kPa (50 psi)
ASTM D5385
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum longitudinal tensile strength (Type 1, Grade A)650 N/50 mm
Minimum longitudinal elongation at break (Type 1, Grade A)40 %
Maximum water absorption (all types)1.0 % by mass
Low temperature flexibility (no cracking at)0 °C
Minimum puncture resistance (Type 1)150 N
Minimum softening point (for APP membranes)150 °C
Tables & Referenced Sections
Key Tables
Table 1 - Requirements for Type 1 Modified Bitumen Membranes (Polyester Reinforced)
Table 2 - Requirements for Type 2 Modified Bitumen Membranes (Glass Fibre Reinforced)
Table 3 - Test Methods for Modified Bitumen Membranes
What are the main types of membranes covered by IS 14777?+
Type 1 (with polyester mat reinforcement) and Type 2 (with glass fibre mat reinforcement), each available in Grade A and B based on performance.
What is the difference between polyester (Type 1) and glass fibre (Type 2) reinforcement?+
Polyester (Type 1) offers higher tensile strength and elongation, making it more robust and suitable for demanding applications. Glass fibre (Type 2) provides excellent dimensional stability.
What is the test for heat resistance?+
The softening point test (using Ring and Ball apparatus as per IS 1205) is used. For APP membranes, it is typically required to be above 150°C.
Does this code specify how to install the membrane?+
No, IS 14777 is a material specification. Application and installation procedures are covered in codes of practice like IS 1346 and manufacturer's guidelines.