Similar International Standards
EN 1313-1:2022CEN (European Committee for Standardization), Europe
HighCurrent
Round and sawn timber — Permitted deviations and preferred sizes — Part 1: Softwood sawn timber
Covers dimensional tolerances and preferred sizes for coniferous sawn timber, directly aligning with a key part of IS 190.
PS 20-20U.S. Department of Commerce / American Lumber Standard Committee, Inc. (ALSC), USA
MediumCurrent
American Softwood Lumber Standard
Establishes standard sizes, grading provisions, and inspection for North American softwood lumber, but with different sizing and grading systems.
ISO 738:2009ISO (International Organization for Standardization), International
HighCurrent
Coniferous and broadleaved sawn timber — Sizes — Permitted deviations and preferred sizes
Specifies permitted deviations and preferred sizes for sawn timber, covering the core dimensional aspects of IS 190.
BS 4978:2007+A2:2017BSI (British Standards Institution), UK
MediumCurrent
Visual strength grading of softwood - Specification
Focuses specifically on the visual grading of softwood for strength, which corresponds to the defect-based grading in IS 190, but uses a different methodology (strength classes).
Key Differences
≠IS 190 uses a simple visual grading system (Grade I, Grade II) based on permissible defects. European standards (e.g., EN 14081-1) use strength classes (C16, C24, etc.) determined visually or by machine, while US standards (PS 20) use complex grade names tied to end-use categories (e.g., 'Select Structural', 'No. 2').
≠IS 190 specifies timber sizes and tolerances in actual millimeters. The US system (PS 20) is based on 'nominal' sizes (e.g., 2x4) which are larger than the actual, 'dressed' dimensions, and links moisture content to final size.
≠The Indian standard lists species common to the Indian subcontinent, such as Deodar, Kail, and Chir. International standards focus on species prevalent in their respective regions, such as Spruce/Pine/Fir in Europe (EN) and Douglas-fir/Southern Yellow Pine in North America (PS 20).
≠IS 190 uses specific terminology like 'Baulks' (>50 cm² cross-section) and 'Scantlings' (25-50 cm²). International terminology differs, with the US using terms like 'Dimension Lumber' and 'Timbers' based on nominal thickness and width.
Key Similarities
≈All standards share the fundamental purpose of providing a standardized framework for sawn coniferous timber to ensure quality, predictable performance, and interchangeability in construction.
≈All standards fundamentally rely on controlling natural wood defects such as knots, slope of grain, splits, and wane. While the limits differ, the principle of limiting them to ensure structural integrity and appearance is a common foundation.
≈All standards recognize moisture content as a critical parameter influencing dimensional stability, strength, and durability. They all specify maximum allowable moisture levels for different conditions (e.g., dry, green, service class).
≈The principles for measuring dimensions (thickness, width) and defects (e.g., knot size as a proportion of the face width) are broadly consistent across the standards to ensure repeatable assessments.