osha stair handrail requirements. The first drawing would not be compliant with the height requirements in §1910. osha stair handrail requirements

 
The first drawing would not be compliant with the height requirements in §1910osha stair handrail requirements  Occupational Safety and Health Administration 200 Constitution Ave NW Washington, DC 20210 1-800-321-OSHA 1-800-321-6742

So going back to rfied112's orginal question. California CA/OSHA Title 8 Building Code Stair & Railing Safety & Construction Details. OSHA requires stair landings to be at least the width of the stair and at least 30 inches in depth, measured in the direction of travel [OSHA 1910. 24 for the safe design and construction of fixed general industrial stairs. 13 Stair Rails. 0. My understanding is that there's two requirements here, IBC requires a handrail at 34"-38" (stairs) but requires guardrails at 42" minimum (with some exceptions). handrails for stairs with one side against a wall: 30-38" U. Fortunately, Alaco Ladder is committed to quality and safety, which helped us produce ladders that meet the ship ladder OSHA code. Handrails may not be mandatory under. 28(b)(11)(ii) provides handrail requirements. For example, stairs manufactured with a 45-degree stairway rise must have a minimum rise and tread of 8. For shorter stairs, or stairs not open to a fall, or stairs installed before 1/17/17, all you need is a handrail. 851 (b) All stairs, passageways, ladders and incidental equipment thereto, which are covered by this section, shall be periodically inspected and maintained in a clean safe condition. Click to view image. From a height of 36 inches (914 mm) to 42 inches (1067 mm), guards shall not have openings that allow passage of a sphere 4 3 / 8 inches (111 mm) in diameter. Design and Construction of Railings. NFPA 101 Figure A. 5”Residential Interior Stairs Code Requirements. The top member of railing usually serves as a handrail. 1910. OSHA requires railings on open sides of stairwells and a handrail on at least on the side, preferably the right side descending at 42″ high. Stairs should have a handrail on at least one side if they are less than one metre wide, and on both sides if wider than this. Minimum 6′-8″ headroom. Plus, they are required to have an intermediary landing if the staircase has a rise of 12’ or more. 24 (e), if they have a rise of 7. HTML PDF: 296-24-74025: Ship stairs. 1052 (b) - OSHA does not have the legal authority to evaluate and certify products. 3 Exit Stair Handrails . 5 feet is constructed next to a pedestrian path, a handrail is required. OSHA requirements are set by statute, standards, and regulations. E. This code information sheet is not an all-inclusive list of state laws or additional code requirements that. Handrails on stairways: Each flight of stairs having at least four risers and three treads must have: • At least one handrail. 2. Handrails need to be easy to firmly grasp if a person loses balance. Common types of problems include malfunctioning electrical service or even missing handrails on stairs. General requirements. Figure D-12-- Handrail Measurement. " 29 CFR 1910. 29 - Fall protection systems real falling object protection-criteria and practices. 23 that addresses stair railings is subsection (e) (2) and not (e) (1). scope, purpose and appli-cation 1. 1910. The vertical distance from the top of a tread to the top of the next higher tread. 3 (2000)). General OSHA Handrail Requirements. Stair towers [29 CFR 1926. There shouldn't be obstructions on the top or sides of the handrails. Haydl: This is in response to your letter of June 24, 2004 regarding the Occupational Safety and Health Administration (OSHA) standards for heights for stair rails and handrails and corresponding building code requirements. 04(3)(b)6. the International Building Code or IBC sets the stair and handrail requirements for public buildings and public spaces. Handrails are required for stairs in many applications and must meet standards as specified by R311. 5″. Handrails may project from each side of a stairway a distance of 3 1/2 inches into the required width. The employer must ensure:505. Enforcement. The Bulletin is advisory in nature, informational in content, and is intended to assist employers in ADA Chapter 5 Section 505. Thank you for your interest in occupational safety and health. Viewrail offers 36”,. (a) General. 91-596, encourages states to develop and operate, under OSHA guidance, their own job safety and health plans. (c) Stair rails and handrails. Oh, and my name is Rod, not Rob. Use internal couplings, Type 18-7, to maintain continuity. 23 (a) (1) - Personal Fall Arrest System or Ladder Safety System on Fixed Ladders, and Fixed Ladders Used on Grain Silos for Emergency Escape - 10/18/2019. 502(b)(3) requires railing systems meet a 200 pound concentrated load test. When the top edge of a stairrail system also serves as a handrail, paragraph (c) (7) of this. Ramps, Runways, Stairwells, and Stairs. Code compliant products. You had specific questions regarding the use of ship's stairs in general industry. Subchapter 4. 27 inches. ACTION: Notice of proposed rulemaking. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm). 28 includes unprotected sides and edges. Below are some safety tips to keep in mind the next time you approach a stairway: Use the handrail. The leading edge of exit stair landings shall be marked with a solid and continuous marking stripe consistent with the dimensional requirements for stair treads and shall be the same lengths, and consistent with, the stripes on the steps. 2. 5 inches (24 cm); andThe same height specifications apply to handrails on stairs. 28 and 1910. WASHINGTON, DC – The U. 9 Stairways, handrails and guards: Every exterior and interior flight of stairs having more than four risers, and every open portion of a stair, landing or balcony which. A ladder or stairway must be provided when the worksite has a break in elevation of 19” (48cm) or more, and there is no runway, ramp, embankment, or personal hoist for workers’ access. 451(e)(4)]Law and Regulations ; Federal Registers ; Open for Comment ; Regulatory Agenda ; Standard Interpretations ; Training Requirements by Standard ; Enforcement Back. HEALTH AND SAFETY DETERMINATION: Standard This is a. A stair rail may serve as a handrail only when the top surface of the top rail is between 36 and 38 inches from the. Doors and gates opening onto stairway. 2. As a result, four inches would be the maximum allowable opening. Stairways less than 44 inches (1118 mm) in width or stairways serving one individual dwelling unit in Group R, Division 1 or 3 Occupancy or a Group R, Division 3 congregate residence may have one handrail. Stairways and handrails that are part of a means of egress are addressed by the IBC (§1009 (2003), §1003. 2 Christy Dr. (1) Stairways shall be al least 24 inches in width and shall be equipped with stair rails, handrails, treads, and landings. A proposed rule announced by OSHA on May 20 would update certain handrail and stair rail system requirements for the agency’s general industry walking-working surfaces standard. 5" tall, with no more than a 1/4" gap at the bottom. 5 QUALITY ASSURANCE A. Beginning with the general requirements: All stairways constructed in the State of California must be at least 24 inches in width and must be fortified with appropriate stair rails, handrails, treads, and landings. [39 FR 23502, June 27, 1974, as amended at 43 FR 49744, Oct. Handrails ship unattached and bolt into place. OSHA 1910. Midrails, screens, mesh, and other. Handrails shall be provided on not less than one side of each flight of stairs with four or more risers. The following general requirements apply to all stairrails and handrails: Stairways having four or more risers, or rising more than 30 inches (76 cm) in height, whichever isFor stair rail systems installed on or after January 17, 2017, the top rail and handrail must be separate. 502 (b) (3), (4), and (5). Railings and handrails. 15 Training Requirements. 1050(a) Scope and application. 5. DEFICIENCY CRITERIA: There is movement in the anchors of the handrail. Rod Sapyta P. 1) 1. Ramps, Runways, Stairwells, and Stairs. Re: Stair rail and hand rail heights; §1926. Anchorage. 5") Hand Railing heights: U. 451 (b) (3) (ii) The maximum distance from the face for plastering and lathing operations shall be 18 inches (46 cm). Stairs. Installing proper stair rails wherever required is indeed a key component of preventing slips, trips, and falls at work, but employers need to do more than simply meet any state and federal requirements. This discussion serves as a quick and easy reference for use on job sites. 451 (b) (4) Each end of a platform, unless cleated or otherwise restrained by hooks or equivalent means, shall extend over the centerline of its support at least 6 inches (15 cm). 29(k)(1), the new toeboard requirement needs to be at least 3. Safety is Paramount when it comes to Stairways-Part M. Construction Safety Orders Article 17. For example, ANSI standard A1264. 1(b)Handrails, Guards, Grab Bars, Seats and Vehicle Barriers). We are going to look at five key IBC code requirements for handrails. Handrail is rail that provides a handhold on a platform, walkway, stairway or step ladder. Typical locations for guarding 36 18. Four or More Risers: According to OSHA regulations, handrails are required on stairways with four or more risers (steps). California safety requirements for the construction of stairways, ramps, stair rails which is governed by the California Code of Regulations. In All Other Areas . Basement entry stairs, steps, handrails: this document describes details for constructing, repairing, or inspecting basement stairs, railings, landings, treads, exterior entries to basements, basement stairwell covers & drains, and related conditions for safety and proper construction. Regarding handrails, there are two sets of regulations: OSHA (Occupational Safety and Health Administration) and the ADA (Americans with Disabilities Act). D* - Step width: 90 cm min. Not only are the treads generally deeper, but also there are usually more treads required. 75 inches each. Stair Rails and Handrails. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm). Standard height requirements for each are stated in (f)(1). Our ladders use heavy-duty aluminum alloy, so you can rest assured that they can handle your load requirements without. The employer must ensure: ( i) Each employee on a scaffold is protected from falling in accordance 29 CFR part 1926, subpart L; and. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Strength. 2. 17, 2017, must be at least 30 inches from the leading edge of the stair tread to the top surface of the top rail, while those installed on or after Jan. (a) Stairways shall have handrails or stair railings on each side, and every stairway required to be more than 88 inches in width shall be provided with not less than one intermediate stair railing for each 88 inches of required. If your system was installed before January 2017, the mandatory height decreases to 30 inches. 44 inches (1. Means of Egress. The section of the OSHA code that specifies most of the primary guardrail and handrails as it directly relates to safety railing is 1910. OSHA is therefore proposing two separate provisions for stairs with two open sides Start Printed Page 27334 and a width of less than 44 inches: The corrected requirements for new handrails and stair rail systems (located in Table D-2), and a separate provision to retain the current requirements for already existing handrails and stair rail systems. Top of gripping surfaces of handrails shall be 34 inches (865 mm) minimum and 38 inches (965 mm) maximum vertically above walking surfaces, stair nosings, and ramp surfaces. 23 includes requirements for ladders, where OSHA defines handrail requirements on platforms and how high safety railings must be. Different requirements for children show a maximum height of 28″ with a minimum clearance of 9″ between the adult rail and the childrens’ rail, which is only a recommendation and not a requirement. The termination point may also be a newel post per FBC-R 311. Guarding design 35 17. The employer must provide, and ensure each employee uses, a safe means of access and egress to and from walking-working surfaces. This strength and stability is crucial. Quoting from the new text (note all is from the same section/page): The h. Handrail, stair rail, and guardrail system requirements. Handrails shall have a clear space between the handrail and a wall or other surface of at least 1 ½ inches. Handrails with a non. Find out the top edge height, midrail spacing, force. 42˝ Min. 1926. Not only are the treads generally deeper, but also there are usually more treads required. The following requirements apply to all stairways as indicated: ( 1) Stairways having four or more risers or rising more than 30 inches (76 cm), whichever is less, shall be equipped with: ( ii) One stairrail system along each unprotected side or edge. The height of a handrail above the floor or the nosing of a stair tread, shall be between 900mm and 1100mm. Each stair must also be provided with a railing system. . 3 in the IRC code. 1910. (c) Stair rails and handrails. (c) (1) (ii) One stairrail system along each unprotected side or edge. Stair Rails and Handrails. (b) General requirements. General Physical Conditions and Structures Orders, Article 2. Handrails adjacent to a wall shall have a space of not less than 1 ½ inch between the wall and the handrails. Handrails and stair rail systems are smooth-surfaced to protect employees from injury, such as punctures or lacerations, and to prevent catching. 5. Under §1910. The provision refers to existing Table D–2, Stairway Handrail Requirements, which specifies handrail requirements based on the variables of stair width and how many sides of the stairway are open. Question 3: Can we provide a cage on the ladder, which extends to the handrails on the platform below,. Flights of stairways within dwelling units and flights of spiral stairways are permitted to have a handrail on one side only. 5 inches. See all powder-coated color options. Must have an outside diameter of at least 1 ¼” but no greater than 2”. OSHA stair width is generally a minimum of 22 inches. Overview Dimensions Loads Details Ramps/Stairs Handrails Construction Cal-OSHA FAQs Talk to an Expert 1. • There must be a stair rail at each open side. Handrail height, measured vertically from the sloped plane adjoining the tread nosing , or finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm). Stairs. 1926. ( d) Inspection, maintenance, and repair. g. 2. 3. Basic OSHA Stair Requirements. 502(k) and training that meets the requirements of 29 CFR. This 200 pound load test is designed to stop an employee from a potentially fatal fall, as opposed to the IBC requirement that takes into account the idea that many people may be leaning on the. 24 inches in width, with. 23(e)(5)(ii). The key is to distinguish between the requirements for fall protection guards at open edges, and grabrails/handrails at stairways and ramps. 2Height. You can make your trip up or down a flight of stairs much safer if you remember to use the handrail. U. Handrails must be provided on at least one side of closed stairways, and both railings and handrails must be installed in accordance with 1910. 2. The handrail is clearly a center. Standard railings shall be provided on the open sides of all exposed stairways and stair platforms. Enforcement. Examples of code requirements our spiral stairs meet include: a minimum clear width at and below the handrail of 26 inches (660 mm), each tread having a 71/2-inch(190 mm), and minimum tread depth being 12 inches (914 mm) from the narrower edge. 7. IBC/IRC Height Requirements. §3216. The IBC code for structural design has some very specific requirements for deck stairs: Stair rails on decks should be between 34 inches and 38 inches high, measured vertically from the nose of the. IBC handrail code requirements for commercial stairs. 2. The stair shall be capable of withstanding a minimum uniform load of 100 pounds per square foot with a design factor of 1. The Occupational Safety and Health Administration (OSHA) estimates. 23 (d) (1)states: “Every flight of stairs having four or more risers shall be equipped with standard stair railings or standard handrails as specified. Requirements for stairways address treads and risers, surfaces, nosings, and handrails. OSHA is very clear that ship stairs should only be used where you can demonstrate that standard stairs will not work. OSHA published a final rule on walking-working surfaces and personal protective equipment in November 2016 that updated requirements for slip, trip, and fall hazards. OSHA published a final rule on walking-working surfaces and personal protective equipment in November 2016 that updated requirements for slip, trip and fall hazards. Riser. Handrails shall be permitted to be interrupted by a newel post at the turn. NATIONAL STANDARDS FOR THE PHYSICAL INSPECTION OF REAL ESTATE U. The requirements are outlined in OSHA’s general industry standards, specifically in 29 CFR 1910. These handrails cannot project more than 4. Pursuant to §1910. It’s also crucial to ensure your workers follow effective general stair safety protocols while at work, as doing so will limit the chances. • Stair rail system: • Top rail may also serve as handrail if height of the system is between 36 and 38 inches. At the top of stair flights, handrails shall extend a minimum of 12 inches (305 mm) horizontally above landings, beginning directly above the first riser nosing. You indicated from our phone conversation that 1910. We hope you find this information helpful. Elevated catwalks should be provided access by a stairway. SCOPE AND APPLICATION The OSHA rules apply to all stairways and ladders used in construction, alteration, repair (including painting For stair rail systems installed on or after January 17, 2017, the top rail and handrail must be separate. OSHA 30-Hour Construction is an online course that. [IBC 1011. 29 CFR 1910. The top rail of the handrail must be a minimum of 42" [ref. [Statutory Authority: RCW 49. Requirements for Ladders OSHA has reorganized separate rules for fixed ladders, portable wood ladders and portable. The following handrail features are ADA-compliant: There should be at least 1 ½ inches of clear space between the wall and the handrail. 5. 500 (f) (1) (vi) provides the specification criteria for a standard railing exception as follows: (vi) Other types, sizes, and arrangements of railing construction are acceptable, provided they meet the following conditions: (a) A smooth-surfaced top rail at a height above floor, platform, runway, or ramp level of approximately. S. A horizontal part of a. If there are more than four stairs in a stairway, they must have fixed railings. Stair Rails and Handrails. S. reviewed the pertinent ANSI standards and determined that it was appropriate to limit the clearance requirement for handrails and stair rails. Handrails and top rails of the stairs must be able to endure, clearly without failure, at least. A spiral stair with these requirements that is shipped in one section will be an inexpensive, easy-to-ship. The IBC defines the various design requirements for handrails, providing clear and concise specifications. 5-1982 - American National. . To prevent employees from being injured from falls, employers must: Guard every floor hole into which a worker can accidentally walk (using a railing and toe-board or a floor hole cover). 6 cm). Maximum 7 inch stair riser height and minimum 4 inch stair riser height. Stair Rails and Handrails. 24 cm). References. It also provides requirements for temporary service, metal. 05/20/2021 - OSHA National News Release - US Department announces OSHA rule proposal to clarify handrail, stair rail system requirements in general industry Walking-Working Surfaces standard. The final rule could appear in late 2021 or early. 11 inches (27. Handrails should be installed between 34” and 38” from the walking surface of the ramp. The same height specifications apply to handrails on stairs. Department of Labor’s Occupational Safety and Health Administration (OSHA) is proposing updates in the handrail and stair rail system requirements for its general industry, Walking-Working Surfaces standard. The top edge of the handrail must be placed between 34” and 38” above the nosing of the stair treads. OSHA then issued a ruling that allowed the handrail on the stair to double as a guard if it were 36" high. Extend past the length of the ramp and/or stairs. OSHA Requirements for usual ladder 1910. This was a little better but not as logical or as safe as a 42" guard. Recommendation: Providing visual contrast (light-on-dark or dark-on-light) on the top and bottom steps that is approximately 2 inches wide and located either on nosings or at the leading edges of treads is helpful for people with low vision. Ships with rubber bumper attached to the center stringer. 10. All handrails and handrail extensions shall be marked with a solid andIf your warehouse office or other storage system features stairways, you will also need to install guardrails along the unprotected edges according to OSHA article 1910. So if a handrail is provided on one side, the minimum clear width is 31. 1. S. OSHA Handrail Standards. Fixed stairs are in compliance with the standard if the rise and tread run dimensions produce a stairway with an angle to horizontal between 30 and 50 degrees. The OSHA General Requirements (29 CFR 1926. Job-made ladders: ANSI A14. The requirements of OSHA safety regulations for the safe use of ladders and stairs (Subpart X, Title 29 Code of Federal Regulations, Part 1926. 1, 2018 is 30 inches, installed after Dec. DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT Page 5 of 14 DEFICIENCY 2 – UNIT: HANDRAIL IS NOT SECURE. 6. RAILINGS open-sided stairs < 44” require 1 stair rail/side; open-sided stairs > 44” require 1 stair rail and 1 separate handrail/side. _ Stair rails installed after March 15,1991, must be not less than 36 inches (91. A guardrail is on top of the platform to guard against falls, while a handrail is what is along a staircase. Go are numerous standards in the International Fabrication Code is are affiliated specifically to Manual. Railing Crossbars: space between no more than 19" apart. ADA handrails with a non-circular cross-section should have a perimeter dimension between 4″ and 6. 25(b) and (c). with OSHA's requirements for the safe use of ladders and stairways could have prevented many of these injuries. Handrails shall be required at one side only for the following components: (1) Existing stairs (2) Existing ramps (3) New and existing stairs within dwelling units and within guest rooms (4) New and existing ramps within dwelling units and within guest rooms"See figure D-12 Handrail. OSHA. Handrail ends shall be returned to a wall, guard or the walking surface or shall be continuous to the handrail of an adjacent stair flight. If you have a stair open on two sides with a stair width less than 44 inches, it appears as if no handrail is required, just a stair rail (top rail, mid rail toe plate). Therefore let us recap on the residential stair code requirements: Minimum 36 inch clear width for stairway. Minimum handrail wall clearance of 1. 5 inches. 1014. • Ends must return to wall, post or safety terminalStair rails installed before Jan. (1) "Handrail" means a rail used to provide. Plastic ladders: ANSI A14. Rise. 23 (e) (3) (iii), installations, posts and top and intermediate rails are to be of 2-inch by 2-inch by 3/8-inch angles or other metal shapes of equivalent bending strength with posts spaced not more than 8 feet on centers. From time to time, letters are affected when the Agency updates a standard, a legal decision impacts a standard, or changes in technology affect the. 5 inches (9 cm) as measured from the top edge of the toeboard to the level of the. . 5. Steps are uniformly spaced and arranged, with a rise of not more than 10 inches (25 cm) and a depth of not less than 7 inches (18 cm). 2. As for the load calculations, it is imperative to know that. The employer must ensure each safety net system meets the requirements in 29 CFR part 1926, subpart M. When such a railing would be impracticable or ineffective, other effective means shall be provided to prevent employees from falling into the water. Safety Requirements. 23(e)(5)(iii), states in part: "The length of brackets shall be such as will give a clearance between handrail and wall or any projection thereon of at least 3 inches. California Code of Regulations, Title 8, Section 1626. 1, Ex. . It also specifies the dimensions, angles, and materials of standard, spiral, ship, and alternating tread-type stairs, and the vertical clearance above any stair tread to any overhead obstruction. Step Guardrail Height: Unlike ADA guidelines, the guardrails in OSHA steps also act as handrails when the top edge of the guardrail is between 36 and 38 inches above the leading edge of the stair tread. Vertical clearance. - 08/30/1999. 24. 28 and 1910. The upright member of a step situated at the back of a lower tread and near the leading edge of the next higher tread. Type I handrails with a circular cross section must have an outside diameter of between 1. (8 cm) between the handrail and walls, stair rail systems, and other objects. 5. 1910. A stair railing must be similar to a standard railing but the height must be between 30 and 36 inches from upper surface of top rail to surface of tread in line with face of the riser at the forward edge of the tread. 500, GUARDRAILS, HANDRAILS & GUARDS [PDF] Standard Number 1926. * Values are from the National Building Code of Canada (2005). Many contractors construct a combo handrail and stair rail system, installed on both sides, to cover all safety requirements. §1626. In addition, OSHA requires that fall protection be provided when working over dangerous equipment and machinery, regardless of the fall distance. 5, the minimum depth of the tread is 13 inches (330 mm) and not less than one handrail complying with Section 1014 is provided within 30 inches (762 mm) of the. For more information, visit or call OSHA at 1-800-321-OSHA (6742), TTY 1-877-889-5627. Order 4-1998, f/8/28/98, ef. new stairs, inside handrails shall be continuous between flights at landings. Steps and stairs – key dimensions 25 13. Outdoor Stairs: Building codes may have specific requirements for handrails on outdoor stairs, particularly if there are multiple levels or steep inclines. 500, Guardrails, handrails & guards. Some of the requirements for all types of suspension scaffolds include:. OSHA requires stair landings to be at least the width of the stair and at least 30 inches in depth, measured in the direction of travel [OSHA 1910. The ADA also specifies that handrails should have a diameter between 1. 27 inches. Here are the key points regarding handrails for stairs according to OSHA regulations: Four or More Risers: According to OSHA regulations, handrails are required on stairways with four or more. 28 and 1910. 1- 2000 Safety Code for Elevators and. (1) A stairway shall have a handrail on at least one side, and if 1 100 mm or more in width, shall have handrail s on both sides. 1. 24 (a) Step bolts. (B) Definitions. Stairs and ramps shall have handrails on both sides, unless otherwise permitted. 5, the minimum depth of the tread is 13 inches (330 mm) and not less than one handrail complying with Section 1014 is provided within 30 inches (762 mm) of the. 5 inches on either side of the stairway. See §1910. 28(b)(11)(i) “Each employee. (2) A mid-rail shall be halfway between the top. Maximum 7-3/4 inch stair riser height. That part of §1910. The run (tread length) should be a minimum of 223mm and a maximum of 320mm. HEIGHT CLEARANCE minimum 6’6” clearance from nose of tread to overhead obstruction. 23(e)(6) states: "All handrails and railings shall be provided with a clearance of not less than 3 inches between the handrail or. For stair width, expect a minimum of 44 inches in most cases and 36 inches in areas populated on average by less than 50 people. Handrails must be placed between 34″ and 38″ in height, measuring from the nosing of the stair. • Handrails must be between 30 and 38 inches as measured from the leading edge of the stair tread. The termination point may also be a newel post per FBC-R 311. 6. The employer must ensure: 1910. The minimum load capacity must be at least 100 pounds per square foot, with a minimum tread center concentrated load of at least 300 pounds. 5”. Intermediate stair railings shall be spaced.