Minimum clear walking path of 26 inches. A 5-foot diameter or larger stair will provide this width
Each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge
All treads will be identical
The tread rise shall not be more than 9 1/2 inches high
Minimum headroom of 6 foot 6 inches shall be provided, measuring plumb from the edge of the platform down to the tread below
Landing width shall not be less than the required width of the stairway. Minimum spiral stair tread width is 26 inches – Salter’s code platforms start at 31 inches wide
Stair balusters shall be spaced so a 4-inch object cannot pass between. The IRC Code permits a 4 3/8 inch space
Balcony/Well Enclosure guardrail balusters shall be spaced so a 4-inch object cannot pass
Balcony/Well Enclosure guardrail height shall not be less than 36 inches – If your state or municipality requires 42-inch tall guardrails, the sales order must reflect this detail
The stairway shall be equipped with one handrail on the wide edge of the tread
Handrail height, measured vertically from the tread nosing, shall be not less than 34 inches and not more than 38 inches
Handrail grip size
Type I-Handrails with a circular cross section shall have an outside diameter of at least 1 1/4 inches and not greater than 2 inches – Salter’s standard circular handrail is 1 1/2 inch diameter. This will address the UBC minimum cross section of 1 1/2 inch diameter. If the handrail is not circular, it shall have a perimeter dimension not greater than 6 1/4 inches
Type II-Handrails, with a perimeter greater than 6 1/4 inches, shall provide a graspable finger recess area on both sides of the profile. For further information on our Type II options, please contact our sales department
Verify what handrail size and shape your inspector will require. Handrail size and shape are a very controversial area within the building code. We recommend that you use our standard 1 1/2″ round handrails or our 1 3/4″ x 1 3/4″ solid wood handrail to comply with the proper circumference
A 300 lb. concentrated load is required. On request, our sales department can provide structural calculations for your job specifications
