Mylen BUILDING CODE SPECIFICATIONS
Mylen Spiral Stairs Comply with National Building Codes
Mylen 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, and IFC codes.
- 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 ½ 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
- The landing width shall not be less than the required width of the stairway. The minimum spiral stair tread width is 26 inches.
- 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 between.
- 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 not be 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. (Mylen’s standard circular handrail is 1 1/2 inch in diameter. This will address the UBC minimum cross-section of 1 1/2 inch diameter.)
- A 300 lb. concentrated load is required. On request, our sales department can provide structural calculations for your job
specifications.
Mylen’s standard code package does not address the open space between each tread (open rise stair). If your local building code requires no more than 4” space in this area, please call 855-821-1689 to have riser bars included in your order or speak with our customer support team for other options.
Visual Interpretation of IRC 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). Minimum headroom of 6 feet, 6 inches (1982 mm) shall be provided (See above diagram).
Technical Specification Guide
Collection Overview
Powder-coated white, gray, or black steel column sleeves, offered with either laminate wood treads and platform or color-matched 3/8” steel treads and platform. The Hayden collection is offered with horizontal stainless steel line rail infill and color-matched aluminum handrails and is suitable for loft installations. Either tread option is available with Anti-slip Traction Tread Covers. Adjustable rise from 8 ½” to 9 ½” between treads via 1/8” spacers. Mylen Stairs stands behind our product with a five-year Warranty on everything we sell and a lifetime warranty on metal fabrication (see below for details). You can trust us if you have a problem, and we will fix it for you, that’s the bottom line. If you have any questions please e-mail us at info@mylenstairs.com or call us at 855-821-1689. More detailed warranty information is available on our Warranty Disclaimer document or on our www.mylenstairs.com web site.
Color and Finish Options
The Hayden Collection is offered with the following color and finish options to suit your design tastes and specific installation application. The Hayden Collection is recommended for interior installations only.
| Column Sleeves | Powder Coated White, Gray or Black Steel |
| Balusters Only
(Laminate Treads Option) |
Powder Coated White, Gray or Black Steel |
| Treads and Balusters
(Steel Treads Option) |
Powder Coated White, Gray or Black Steel |
| Tread Type | Smooth Steel or Smooth Laminate Wood |
| Handrail | Powder Coated White, Gray or Black Aluminum |
| Optional Traction Tread Covers | Black |
Diameter Measurements
| Stair Diameter | Floor Opening |
| 42” (3’6”) | 46” |
| 60” (5’0”) | 64” |
The recommended opening should be at least 4″ wider than the staircase’s diameter Please refer to the following chart for more diameter measurement information.
Walking Path Measurements
The clear walking path is the measurement from the inside of the column to the inside of the handrail and will vary by model and diameter choice. Please refer to the following chart for more walking path measurement information.
Height Measurements
The Hayden Collection is offered in various tread counts to cover a multitude of height applications. Each tread is adjustable from 8 ½” to 9 ½” between treads. Floor to Floor height is measured from the lower floor to the top of the floor above. Please refer to the chart below to find the proper tread count for your installation application.
| Floor to Floor Measurements | ||
| Tread Count | Height Min | Height Max |
| 9 | 85″ | 95″ |
| 10 | 93.5″ | 104.5″ |
| 11 | 102″ | 114″ |
| 12 | 110.5″ | 123.5″ |
| 13 | 119″ | 133″ |
| 14 | 127.5″ | 142.5″ |
| 15 | 136″ | 152″ |
Please call 855-821-1689 or visit mylenstairs.com for additional product information, assistance or questions.
