What is the maximum pitch allowed for wooden stairs in houses?

The maximum recommended pitch (angle of inclination) for residential stairs is generally 42 degrees.

What are the standard dimensions for treads and risers?

For residential buildings, the minimum going (tread width) is 250 mm and the maximum rise is 190 mm.

How do I choose the correct timber species for the stair?

Timber should be selected based on the recommended species in Table 1, and should conform to structural grading as per IS 399 and IS 883.

IS 1634

: 1992

Code of practice for design and construction of wood stairs for houses

CurrentSpecializedCode of PracticeBIMArchitectural · Building Construction Practices incl. Painting, Varnishing

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This code outlines the recommended practices for the design, selection of materials, and construction of wooden stairs in residential houses. It provides standardized dimensions for safety and comfort, and details proper joinery and seasoning requirements to ensure durability and structural stability.

Code of practice for design and construction of wood stairs for houses

Quick Reference Values

Minimum clear width of stair850 mm

Minimum going (tread width)250 mm

Maximum rise (riser height)190 mm

Maximum pitch of stair42 degrees

Recommended moisture content10% to 14% (varies by climatic zone per IS 287)

Practical Notes

Always ensure timber is properly seasoned to the moisture content recommended in IS 287 to prevent post-installation shrinkage, warping, and squeaky treads.

Stringers must be adequately dimensioned and supported to prevent noticeable deflection under live loads; refer to IS 883 for timber stress calculations.

Treads and risers should be properly housed into the stringers, glued, and wedged to ensure tight and durable joints.