What defines a baulk vs. a scantling?

Baulks are sawn timber pieces of larger cross-sections, while scantlings refer to sawn timber pieces with specific smaller structural dimensions outlined in the standard.

How are the grades of timber classified in this code?

Grades are classified based on the presence, size, and frequency of permissible defects such as knots, shakes, and wanes.

Is preservative treatment covered in this IS code?

No, preservation guidelines are generally covered in separate codes like IS 401; this code focuses primarily on dimensions, species, and grading of sawn timber.

IS 1326

: 1992

Non-coniferous sawn timber (Baulks and scantlings)

CurrentSpecializedSpecificationMaterials Science · Timber and Timber Stores

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This standard specifies requirements for non-coniferous (hardwood) sawn timber converted into baulks and scantlings for structural and general purposes. It covers dimensions, tolerances, grading based on defects, and permissible species.

Non-coniferous sawn timber (Baulks and scantlings)

Quick Reference Values

tolerance on width and thickness up to 100mm± 2 mm

tolerance on width and thickness above 100mm± 3 mm

tolerance on length+ 50 mm, - 0 mm

Practical Notes

Always cross-reference with IS 399 to ensure the chosen timber species provides adequate durability and strength for the intended use.

Inspect timber visually for knots, splits, and shakes to ensure they fall within the permissible limits for the specified grade before acceptance.

Ensure moisture content conforms to IS 287 limits for the specific climatic zone to prevent warping and shrinkage post-installation.