Source-linked references

Building Codes and Standards

These code pages connect calculator output to the rule that governs it. Each page names the section, shows a focused limit table, links to the primary source, and states where local adoption, exceptions, structural design, or professional review still control. They are navigation and planning aids, not substitute code books.

Code reference

IRC R311.7 Stair Code

Planning summary of common International Residential Code stair dimensions and measurement points.

Code reference

UK Building Regulations Part K Stairs

Planning summary of common Approved Document K private stair dimensions.

Code reference

AS 1657 Stairs

Planning summary for fixed industrial access stairs under AS 1657.

Code reference

ADA Ramp Slope

US Access Board ramp slope, rise, width, and landing planning summary.

Code reference

OSHA Stair Requirements

OSHA 1910.25 planning summary for standard stairs in general industry.

Code reference

AWC Span Tables Explained

How to select a wood joist, rafter, or header row without treating one span number as universal.