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IS 14756:2000 is the Indian Standard (BIS) for aluminium and aluminium alloy sheets, strips, and plates for roofing and cladding. This standard specifies the requirements for aluminium and aluminium alloy sheets, strips, and plates used for roofing and cladding. It details the chemical composition, temper conditions, mechanical properties (such as tensile strength and elongation), and dimensional tolerances for various alloys.
Specifies requirements for aluminium and aluminium alloy sheets, strips, and plates intended for roofing and cladding.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! This standard covers the base metal only; coatings or paints applied to the sheets are covered by other standards like IS 13871.
! The choice of alloy and temper (e.g., 31050-H14) is critical, balancing strength requirements with the formability needed for specific roofing profiles.
! The standard does not provide design guidance for wind loads on roofing/cladding systems; this must be addressed separately using codes like IS 875 (Part 3).
Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
Covers the general requirements, alloys, and properties for aluminum sheet and plate, which are the base materials for roofing and cladding.
EN 485-2:2016+A1:2018CEN (European Committee for Standardization), Europe
HighCurrent
Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical properties
Specifies mechanical properties for the same product forms (sheet, strip, plate) and alloys, forming the basis for European roofing/cladding products.
EN 508-2:2020CEN (European Committee for Standardization), Europe
HighCurrent
Roofing and cladding products from metal sheet - Specification for self-supporting products of steel, aluminium or stainless steel sheet - Part 2: Aluminium
Directly addresses self-supporting aluminium sheets for roofing, making its application scope nearly identical to IS 14756.
AS/NZS 1734:1997Standards Australia / Standards New Zealand, Australia/New Zealand
MediumCurrent
Aluminium and aluminium alloys - Flat sheet, coiled sheet and plate
Defines alloys, tempers, and tolerances for flat aluminum products, similar to ASTM B209, serving as a primary material specification.
Key Differences
≠IS 14756 uses a five-digit alloy designation system (e.g., 31000), whereas international standards predominantly use the four-digit Aluminum Association (AA) system (e.g., 3003).
≠IS 14756 is a single, comprehensive standard for roofing and cladding, while international practice often separates the material specification (e.g., ASTM B209, EN 485) from the application-specific standard (e.g., EN 508-2).
≠While based on the same principles, specific values for dimensional tolerances (thickness, width, flatness) can have minor variations between IS 14756 and its international counterparts due to different regional manufacturing practices.
≠The list of specified standard alloys in IS 14756 is more limited and tailored to Indian market needs compared to the extensive list of alloys covered in broader standards like ASTM B209.
Key Similarities
≈All standards utilize the same fundamental temper designation system (e.g., 'H' for strain-hardened) derived from the Aluminum Association to define the material's mechanical condition.
≈The core mechanical properties used for quality assurance — tensile strength, proof stress (yield strength), and elongation — are universally specified across all comparable standards.
≈The chemical composition limits for corresponding alloys (e.g., IS 31000 vs. AA 3003) are virtually identical, ensuring similar material performance and characteristics.
≈All standards cover the same primary product forms relevant to roofing and cladding: sheets, strips (coils), and plates.
Parameter Comparison
Parameter
IS Value
International
Source
Alloy Designation
31000
3003
ASTM B209 / EN 485-2
Chemical Composition (Manganese) for 31000/3003
1.0 - 1.5%
1.0 - 1.5%
ASTM B209
Tensile Strength (UTS) for 31000/3003, Temper H14, 0.5-1.5mm
140 - 180 MPa
140 - 175 MPa (20-25 ksi)
ASTM B209
0.2% Proof Stress for 31000/3003, Temper H14, 0.5-1.5mm
130 MPa min
125 MPa (18 ksi) min
ASTM B209
Elongation % for 31000/3003, Temper H14, 0.8-1.2mm
3% min (on 50mm gauge)
4% min (on 50mm gauge)
ASTM B209
Thickness Tolerance for 1.0mm sheet (1000-1500mm width)
±0.08 mm
±0.076 mm (±0.003 in)
ASTM B209
Alloy Designation
31050
3105
ASTM B209 / EN 485-2
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum tensile strength for Alloy 31000 (H2 Temper)140 MPa
Minimum tensile strength for Alloy 31050 (H14 Temper)145 MPa
Minimum elongation for Alloy 31000 (O Temper) on 50 mm gauge length20 %
Standard thickness tolerance for 1mm thick sheet (up to 1250mm wide)±0.10 mm
Copper content limit for Alloy 310500.30 % max
Magnesium content limit for Alloy 520002.2-2.8 %
Tables & Referenced Sections
Key Tables
Table 1 - Chemical Composition of Aluminium and Aluminium Alloys
Table 2 - Mechanical Properties of Aluminium and Aluminium Alloy Sheets, Strips and Plates
Table 3 - Permissible Tolerances on Thickness of Sheets, Strips and Plates
Table 4 - Permissible Tolerances on Width of Sheets and Strips
What are the common alloys specified for roofing sheets in this standard?+
Commonly used alloys include 31000, 31050, and 52000. Their properties are given in Tables 1 and 2.
What does the 'H' temper designation mean?+
The 'H' temper indicates that the material is strain-hardened to increase its strength. The digits following 'H' specify the degree of hardening (e.g., H14 is half-hard).
What is the minimum tensile strength for Alloy 31050 in H14 temper?+
145 MPa (or N/mm²), as per Table 2.
Does this IS code specify the profile or shape of the roofing sheet?+
No, it only specifies the properties of the flat sheets, strips, and plates that are used to manufacture the final profiled products.