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IS 1634:1992 is the Indian Standard (BIS) for design and construction of wood stairs for houses. 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
Overview
Status
Current
Usage level
Specialized
Domain
Architectural — Building Construction Practices incl. Painting, Varnishing
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
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.
International Residential Code for One- and Two-Family Dwellings
Covers stairways (Section R311.7) in residential buildings, providing very similar dimensional requirements.
Approved Document KMinistry of Housing, Communities & Local Government, UK
HighCurrent
Protection from falling, collision and impact
Defines requirements for 'private stairs' in dwellings, covering pitch, rise, going, and handrails.
NCC 2022Australian Building Codes Board (ABCB), Australia
HighCurrent
National Construction Code, Volume Two - Housing Provisions
Specifies design and construction of stairs in Class 1 buildings (houses), including geometry and barriers.
NBCC 2020National Research Council Canada (NRCC), Canada
HighCurrent
National Building Code of Canada
Part 9 covers stairs in housing and small buildings, defining rise, run, width, and headroom.
Key Differences
≠IS 1634 specifies a lower minimum width for main stairs (850 mm) compared to the US IRC (914 mm) and uniquely defines 'service stairs' with a narrower width (750 mm), a classification not explicitly made in most other major codes.
≠The maximum allowable stair pitch in IS 1634 is 40 degrees, which is steeper than the Australian NCC's 37-degree limit but less steep than the 42-degree limit for private stairs in the UK's Approved Document K.
≠The Australian NCC employs a more complex set of geometric constraints than IS 1634, requiring stairs to satisfy both the 2R+G rule (550-700mm) and an R+G rule (425-700mm), making its design envelope more restrictive.
≠While IS 1634 suggests a handrail height of 850-900 mm, both UK and Canadian standards allow for a higher placement, with the UK's Approved Document K specifying 900-1000 mm and Canada's NBCC allowing up to 1070 mm.
Key Similarities
≈The ergonomic rule relating riser (R) and going (G) as '2R + G' is a common principle. IS 1634's range (550-650 mm) is very similar to that in the UK (550-700 mm) and Australian (550-700 mm) standards, showing a shared understanding of comfortable gait.
≈All compared standards mandate a minimum headroom of approximately 2 meters to prevent head injuries. IS 1634 requires 2.1 m, while the US IRC requires 2.03 m (6'8"), and Canada's NBCC requires 2.05 m over the run.
≈The provision for a nosing projection on the front of the tread is consistent across codes. The dimensional requirements in IS 1634 (15-25 mm) are very similar to those in the US IRC (19-32 mm).
≈The fundamental parameters used to define stair geometry — riser height, tread/going depth, clear width, and headroom — are the primary focus of IS 1634 and all its international counterparts.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Width (Main Stairs)
850 mm
36 inches (914 mm)
IRC 2021
Maximum Riser Height
190 mm
7.75 inches (197 mm)
IRC 2021
Minimum Tread/Going Depth
250 mm
220 mm
Approved Document K
Minimum Headroom
2100 mm
6 feet 8 inches (2032 mm)
IRC 2021
Handrail Height (above pitch line)
850 mm to 900 mm
900 mm to 1000 mm
Approved Document K
Maximum Pitch/Slope
40 degrees
Max 37 degrees (via riser/going limits)
NCC 2022
Ergonomic Rule (2R + G)
550 mm to 650 mm
550 mm to 700 mm
NCC 2022
⚠ Verify details from original standards before use
Key Values5
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)
Tables & Referenced Sections
Key Tables
Table 1 - Recommended Species of Timber for Wood Stairs