Therefore to understand if a spiral staircase is compliant, let us take a look at code section R311.7.10.1 within the 2018 International Residential Code (IRC). Unlike buildings subject to the International Building Code (IBC) where there are limitations to the use of spiral stairs in these buildings, dwelling units subject to the IRC have no limitations to the use of this type of stair as long as it meets the size and clearance requirements within Section R311.7.10.1 of the IRC.įun Tip: To learn the difference between the International Residential Code (IRC) and the International Building Code (IBC), be sure to check out this POST.Īlthough this type of stair system might be difficult to use or even move furniture around, it is allowed under the International Residential Code. Our capabilities include carbon steel, stainless and aluminum. Whether you’re looking for cost-effective egress stairs or a showcase stair, we are your one-stop solution. When a spiral stairway is installed within an individual dwelling unit, it must comply with the International Residential Code (IRC). At Cutting Edge Stair, we have the knowledge & expertise to provide an affordable solution to all of your project stair and rail needs. concentrated load is required.A spiral stairway or staircase is another type of stair system that the code allows in-lieu of conventional stairs. 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 If there is a wall along the staircase, it is a great place to add family photographs and art. The stairway is not just about rails and spindles. Make sure you follow local code on safety when deciding the stairway design. Handrail size and shape are a very controversial area within stair code. Don’t forget to make good use of the space below the staircase. Verify what handrail size and shape your inspector will require.For further information on our Type II options, please contact our sales department 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.If the handrail is not circular, it shall have a perimeter dimension not greater than 6 1/4 inches This will address the UBC minimum cross section of 1 1/2 inch diameter. 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.The stairway shall be equipped with one handrail on the wide edge of the tread according to stair codes.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.Balcony/Well Enclosure guardrail balusters shall be spaced so a 4-inch object cannot pass.The IRC Stair Code permits a 4 3/8 inch space Stair balusters shall be spaced so a 4-inch object cannot pass between.Minimum spiral stair tread width is 26 inches – Salter’s code platforms start at 31 inches wide Landing width shall not be less than the required staircase width.Minimum headroom of 6 foot 6 inches shall be provided, measuring plumb from the edge of the platform down to the tread below.The tread rise shall not be more than 9 1/2 inches high.Stair tread codes states that each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge.A 5-foot diameter or larger stair will provide this standard stair width Minimum clear walking path of 26 inches.