Salter’s Code Stair Packages will address and meet compliancy with each of the requirements that are listed below. This information will apply to the BOCA Code, UBC Code, IRC Code, and IFC codes.
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| 1. |
Minimum clear walking path of 26 inches. A 5-foot diameter or larger stair will provide this width. |
IRC Stair Building Code
R311.5.8.1 Spiral Stairs. Spiral stairways are permitted, provided the minimum width shall be 26 inches (660 mm) with each tread having a 7 1⁄2 inch (190 mm) minimum tread depth at 12 inches from the narrower edge. All treads shall be identical, and the rise shall be no more than 9 1⁄2 inches (241 mm). A minimum headroom of 6 feet, 6 inches (1982 mm) shall be provided (See above diagram). |
| 2. |
Each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge. |
| 3. |
All treads will be identical. |
| 4. |
The tread rise shall not be more than 9 1/2 inches high. |
| 5. |
Minimum headroom of 6 foot 6 inches shall be provided, measuring plumb from the edge of the platform down to the tread below. |
| 6. |
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.) |
| 7. |
Stair balusters shall be spaced so a 4-inch object cannot pass between. The IRC Code permits a 4 3/8 inch space. |
| 8. |
Balcony/Well Enclosure guardrail balusters shall be spaced so a 4-inch object cannot pass between. |
| 9. |
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.) |
| 10. |
The stairway shall be equipped with one handrail on the wide edge of the tread. |
| 11. |
Handrail height, measured vertically from the tread nosing, shall be not less than 34 inches and not more than 38 inches. |
| 12. |
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 2" B&FG solid wood handrail to comply with the proper circumference.) |
| 13. |
A 300 lb. concentrated load is required. On request, our sales department can provide structural calculations for your job specifications. |
Salter's standard code package does not address the open space between each tread (open rise stair). *IRC Code or IFC Code requires not more than a 4" space in this area, you will need to order our Code Riser treads. |
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