Building Code for StairsBuilt to IBC Stair Code SpecificationsEach of our stair lines, from custom indoor stairs lines to prefab outdoor stairs lines, is available in code-compliant options.OverviewFeaturesBuilding CodeFinishesInstallationTechnical OverviewOur spiral stair building code and IBC stair code specifications provide technical details about the different code and non-code packages we offer for commercial and residential projects. These specifications show standard stair dimensions for height, tread degree, rotation degree, and many more details for each Salter Spiral Stair product type. Please check with your local building inspector for the dimensional requirements of building code for stairs in your area before placing your order.If you have any questions on what stair code-compliance or IBC stair code means for your desired stair line, or want to learn more about spiral stairs, please feel free to contact us and we’ll help develop your spiral staircase plans.Product SpecificationsRequest FREE Consultation and PricingClassic SteelAluminum DeckGalvanizedForged IronSolid WoodRequest a Free ConsultationIRC Stair Building Code and IBC Stair CodeCollaborative One-On-One Web ConsultationR3184.108.40.206 Spiral stairways. Spiral stairways are permitted, provided the minimum clear width at and below the handrail shall be 26 inches (660 mm) with each tread having a 71/2-inch(190 mm) minimum tread depth at 12 inches (914 mm) from the narrower edge. All treads shall be identical. and the rise shall be no more than 91/2inches (241mm). A minimum headroom of 6 feet 6 inches (1982mm) shall be provided (See diagram).Find Your StyleStair Building Code Requirement HighlightsStair Building Code Requirement HighlightsMinimum clear walking path of 26 inches. A 5-foot diameter or larger stair will provide this standard stair widthStair tread codes states that each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edgeAll treads will be identicalThe tread rise shall not be more than 9 1/2 inches highMinimum headroom of 6 foot 6 inches shall be provided, measuring plumb from the edge of the platform down to the tread belowLanding width shall not be less than the required staircase width. Minimum spiral stair tread width is 26 inches – Salter’s code platforms start at 31 inches wideStair balusters shall be spaced so a 4-inch object cannot pass between. The IRC Stair Code permits a 4 3/8 inch spaceBalcony/Well Enclosure guardrail balusters shall be spaced so a 4-inch object cannot passBalcony/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 detailThe stairway shall be equipped with one handrail on the wide edge of the tread according to stair codesStair railing height code, measured vertically from the tread nosing, shall be not less than 34 inches and not more than 38 inchesHandrail grip sizeType 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 inchesType 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 departmentVerify what handrail size and shape your inspector will require. Handrail size and shape are a very controversial area within stair 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 circumferenceA 300 lb. concentrated load is required. On request, our sales department can provide structural calculations for your job specificationsFree Consultation & PricingYou’ll get quick and accurate pricing plus our expert designers can design the perfect stair solution based on your requirements and budget.Call for your free consultation and pricing.Get quick and accurate pricing. Plus, our expert designers can design the perfect stair solution based on your requirements and budget.Call for your free consultation.(855) 585-1327Or fill out this form to receive our detailed product brochure and to schedule your free consultation.Name* First Name Last Name Email* Phone* We value your privacy. Information collected will never be sold, shared, or rented to others.