What is the difference between baulks and scantlings?

Baulks are roughly squared timber logs of larger dimensions (often exceeding 100mmx100mm), while scantlings are sawn timber pieces with smaller, specific cross-sectional sizes.

How is the timber graded according to this code?

It is graded visually into Select Grade, Grade I, and Grade II based on the frequency and size of permissible defects like knots, shakes, splits, and wanes.

What is the permissible moisture content for sawn coniferous timber?

The code does not fix a single value; it directs engineers to IS 287, which specifies moisture content limits based on the geographic and climatic zone of the end-use location.

IS 190

: 1991

Coniferous Sawn Timber (Baulks and Scantlings)

CurrentSpecializedSpecificationMaterials Science · Timber and Timber Stores

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This standard lays down the specifications, standard dimensions, grading rules, and permissible defects for coniferous sawn timber in the form of baulks and scantlings used for general building construction.

Coniferous Sawn Timber (Baulks and Scantlings)

Quick Reference Values

standard lengths1 to 6 meters (typically in increments of 0.25m or 0.5m)

dimensional tolerance width thickness+3 mm, -0 mm for sections up to 100 mm

moisture content referenceDetermined as per IS 287 depending on climatic zones

grading categoriesSelect Grade, Grade I, and Grade II

Practical Notes

Coniferous timber (like Pine, Fir, and Deodar) generally has better strength-to-weight ratios for structural framing but requires careful grading for knots and shakes.

Always specify the required moisture content based on the climatic zone (IS 287) where the timber will be permanently installed to prevent warping and shrinkage.

Grading is purely visual. Structural engineers should align the visual grade (Select, I, II) with permissible stresses given in IS 883 for design.