Before you think about the aesthetics of your spiral stair you need to address the practical issue of building codes. Please contact your local building inspector before you place an order for a spiral stair. There are three national codes that may apply: the CABO (Council of American Building Officials), UBC (Unified Building Code), and BOCA (Building Officials & Code Administrators). The most common specifications result in spirals with the following dimensions/requirements:
Stairways makes every effort to create stairs that will meet or exceed all national codes, but there are often state or even local codes that may supersede the national codes. Codes are frequently tied to the area being accessed; they may be less stringent when stairs lead to an open space such as a loft or cupola, and the square footage of the area be accessed may also make a difference.
Some authorities allow stairs that they warn will not meet code for sole access to a second story, but can be used for auxiliary stairs. If your stair does not have to be built to code specifications, we offer a full line of standard stairs built with 22.5 and 27 degree treads. The stairs can be built in varying diameters. We can also design and build a stair to fit any conditions.
Contact: Katy Hu
Phone: 15112916100
Tel: 86-18934374081
Email: info@whalebuild.com
Add: No. 25, Third Industrial Zone, Caobian, Dali Town, Nanhai District, Foshan City, Guangdong Province, China