OSHA 1910.21 defines a stair riser as the upright (vertical) or inclined member of a stair that is located at the back of a stair tread or platform and connects close to the front edge of the next higher tread, platform, or landing. Stair treads and risers shall comply with Sections 1011.5.1 through 1011.5.5.3. 27.4.2 Height: Top of handrail gripping surface sha ll be mounted between 34 inches (34" = 864m m) and 38 inches (38" = 965m m) above stair nosings. The stair riser height code is also defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of, Alternating Stair Tread Depth Requirements. Application. The OSHA standard for rise and run of stairs is maximum 9.5" rise and minimum 9.5" run (tread depth). IBC 1011.15.2 requires ships ladders to have a minimum tread depth of 5 inches (127mm). For applications without space-restrictions, choose standard stairs with as close as possible to 11" tread depth. Have a minimum tread width of 7 inches (18 cm), measured at the leading edge of the tread (i.e., nosing). Figure D-10 -- Angles for Stairs, Ramps, and Ladders. R311.5.3.1 Riser height. OSHA 1910.25(e)(2) requires ship stairs to have open risers with a vertical rise between tread surfaces of 6.5 to 12 inches (17 to 30 cm). The Michigan Residential Building Code specifies that a riser be a maximum height of 8.25 inches as measured vertically between the leading edges of the adjacent treads. , have less tread depth because as a stair gets steeper, the tread above becomes an obstacle to the tread below. Stairs have uniform riser heights and tread depths between landings; Stairway landings and platforms are at least the width of the stair and at least 30 inches (76 cm) in depth, as measured in the direction of travel; When a door or a gate opens directly on a stairway, a platform is provided, and the swing of the door or gate does not reduce the platform's effective usable depth to: Less than 20 inches (51 cm) for platforms installed before January 17, 2017; and. Have open risers if the tread depth is less than 9.5 inches (24 cm); Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. Think flooring. If tread depth is less than 9.5" alternating tread stairs must have open riser. Stairways clearances Stairways shall be ⥠600mm wide inside the stiles and it is to have a minimum clearance of 550mm between rails. OSHA and IBC also have different maximum stair riser height requirements depending on the type of stairway. The riser height is to be measured vertically between leading edges of the adjacent treads. OSHA will deem those stairs in compliance if they meet the dimension requirements specified in Table D-1 of this section or they use a combination that achieves the angle requirements of paragraph (c)(1) of this section. The riser shall be measured vertically between leading edges of the adjacent treads. shall be permitted in new construction. The riser height shall be measured vertically between the leading edges of adjacent treads. OSHA introduced it's own minimums for tread depth and riser height in the 2017 update to walking-working surfaces. Step riser specifications riser height (<= 7.75" or in some codes <= 7.0" or in Canada <=8.25") maximum and 4 inches (102 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads. OSHA 1910.25(e)(3) requires ship stairs to have minimum tread depth of 4 inches (10 cm). The standard riser is the. ', Maximum Stair Riser Height & Minimum Stair Tread Depth Codes, Stair tread depth and riser height definitions. JUMP TO FULL CODE CHAPTER Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. a height of between 34 and 38 inches above the nosing. Stairs shall not have a variation exceeding 3/16 inch in the depth of adjacent treads or in the height of adjacent risers. 9. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum. OSHA 1910.25(f)(3) requires alternating tread stairs to h. (ship ladder) as a stairway that is equipped with treads, stair rails, and open risers, and has a slope that is between 50 and 70 degrees from the horizontal. International Building Code for Stair treads and risers 1009.3 Stair treads and risers. Spiral stairs must meet the vertical clearance requirements in paragraph (d)(3) of this section. OSHA 1910.25(c)(3) requires standard stairs to have a minimum tread depth of 9.5 inches (24 cm). All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. IBC 1011.14.2 requires alternating tread devices to have a minimum projected tread depth of 8.5 inches (216mm). A stair tread should be a minimum 9.5" deep for stairs used as equipment access under the OSHA standards for stairways. All of these measurements include the finished flooring, so donât forget to take those ⦠[Vermont Amendment to 24.2.5.7] Within any individual dwelling unit, unless protected by an approved automatic sprinkler system, stairs more than one story Under OSHA 1910.21 the stair tread means a horizontal member of a stair or stairway, but does not include landings or platforms. It is a measure of the surface available for the user's foot to rest as they ascend or descend the stair. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3 / 8 inch (9.5 mm). Any variation of risers within a flight of stairs should not be more than â
inch of tolerance. The requirements of paragraphs (c)(2) and (3) do not apply to standard stairs installed prior to January 17, 2017. In one and two family dwellings the maximum riser heights of 7 ¾ in. (B) The minimum tread depth is 9 inches measured from tread nosing to tread nosing. The maximum riser height shall be 8.25 inches (210 mm). 1011.5.1 Dimension reference surfaces. OSHA 1910.25(d)(4) requires spiral stairs to have a minimum tread depth of 7.5 inches (19 cm), measured at a point 12 inches (30 cm) from the narrower edge. Treads shall be 11 inches (280 mm) deep minimum. 504.2 Treads and Risers. IBC 1011.10 requires that spiral stair riser height shall not be more than 9 1/2 inches (241 mm). Handrails must be continuous from a point above the top riser to a point above the lowest riser of each flight of stairs. The rise of steps and stairs must not be less than four inches nor more than eight inches. Figure D-7 -- Door or Gate Opening on Stairway. Less than 22 inches (56 cm) for platforms installed on or after January 17, 2017 (see Figure D-7 of this section); Each stair can support at least five times the normal anticipated live load, but never less than a concentrated load of 1,000 pounds (454 kg) applied at any point; Standard stairs are used to provide access from one walking-working surface to another when operations necessitate regular and routine travel between levels, including access to operating platforms for equipment. According to IBC 1011.5.2, the riser height is measured vertically between the nosings (the leading edge) of adjacent treads. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. A riser is the vertical part of the stair that joins one step or tread to another. The maximum riser height shall be 7 3â4 inches (196 mm). inch variation in riser height within a flight of stairs. The IRC (International Residential Code) calls for a maximum rise (â r â) of 7 ¾â and a minimum run (â R â) of at least 10â. International Residential Code for Stair treads and risers R311.5.3 Stair treads and risers. When paragraph (b)(8) of this section allows the use of spiral, ship, or alternating tread-type stairs, they are installed, used, and maintained in accordance with manufacturer's instructions. material. R311.7.5.1 Riser height. The maximum riser height shall be 8 1 / 4 inches (209 mm). (c) The height of two risers plus the width of one tread shall equal not less than 24 inches nor more than 27 inches. You can see from the chart that the minimum tread depth and maximum riser heights vary greatly between different stair types. IBC 1011.15.2 requires ships ladders to have a maximum riser height of 9 1/2" (241mm). The run must not be less than nine inches. Have a minimum tread width of 18 inches (46 cm). Winding stairways may be used on tanks and similar round structures when the diameter of the tank or structure is at least 5 feet (1.5 m). Under OSHA, a standard stair means a fixed or permanently installed stairway that is not an alternating tread stair, ship stair, or spiral stair. The standard riser is the vertical member of a stair that is located at the back of a stair tread and connects close to the front edge of the next higher tread. A stair tread should be a minimum of 11" deep for stairs used as a means of egress under the 2018 IBC building code. 1. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. The stair riser height code is also defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. Spiral stairs must meet the vertical clearance requirements in paragraph (d) (3) of this section. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). [39 FR 23502, June 27, 1974, as amended at 43 FR 49744, Oct. 24, 1978; 49 FR 5321, Feb. 10, 1984; 81 FR 82987-82990, Nov. 18, 2016; 84 FR 68795, Dec. 17, 2019], Occupational Safety & Health Administration. FIGURE D-8 â Dimensions of Standard Stairs. means a horizontal member of a stair or stairway, but does not include landings or platforms. Handrails shall be m easured vertically from the top of the gripping surface of the handrails to the stair nosing. R311.7.5.1 Risers. 1910.25 (b) (3) Stairs have uniform riser heights and tread depths between landings; The greatest riser height within any flight of stairs must not exceed the smallest by more than three-eighths inch. The IBC maximum rise of a single stair flight is 12. The standard stair tread is the horizontal member of a stair that serves as the walking surface. See the following drawing for required handrails. OSHA does not state specifically a maximum riser height for alternating tread stairs. Have a series of treads installed at a slope of 50 to 70 degrees from the horizontal; Have a distance between handrails of 17 to 24 inches (51 to 61 cm); Have a minimum tread depth of 8.5 inches (22 cm); and. and minimum tread depths of 10 in. IBC 1011.5.2 requires that stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet, 8 inches (203 cm), as measured from the leading edge of the tread. as a type of stairway consisting of a series of treads that usually are attached to a center support in an alternating manner such that an employee typically does not have both feet on the same level while using the stairway. The riser shall be measured vertically between leading edges of the adjacent treads. Spiral, ship, or alternating tread-type stairs are used only when the employer can demonstrate that it is not feasible to provide standard stairs. OSHA 1910.25(f)(3) requires alternating tread stairs to have a minimum tread depth of 8.5 inches (22 cm). Have a maximum riser height of 9.5 inches (24 cm); 1910.25(d)(3) Have a minimum headroom above spiral stair treads of at least 6 feet, 6 inches (2 m), measured from the leading edge of the tread; Stairs shall comply with 504. Open risers are not permitted. The codes only state a maximum riser height of 7-3/4â. They use the term âtreadâ instead of ârunâ but I think thatâs the cause of some confusion, so Iâll use the standard term ârun.â IRC code limit stair: rise r ⤠7 3/4â³ The maximum riser height shall be 7 3/4 inches (196 mm). OSHA and IBC have different tread depth requirements for different stair types. © 2020 Lapeyre Stair Inc. All rights reserved. Stair tread depths shall be 11 inches (279 mm) minimum. For space-restricted applications, choose alternating tread stairs with more than 2x the usable tread depth as ships stairs. OSHA and IBC determine the minimum tread depths and maximum riser heights based on research of stairways with various tread and riser dimensions. OSHA 1910.25(e)(3) requires ship stairs to h, 1910.25(c)(2) requires standard stairs to h, Alternating Stair Riser Height Requirements, OSHA 1910.25(e)(2) requires ship stairs to h, You can see from the chart that the minimum tread depth and maximum riser heights vary greatly between different stair types. This section covers all stairways (including standard, spiral, ship, and alternating tread-type stairs), except for articulated stairs (stairs that change pitch due to change in height at the point of attachment) such as those serving floating roof tanks, stairs on scaffolds, stairs designed into machines or equipment, and stairs on self-propelled motorized equipment. The risers shall be sufficient to provide a headroom clearance of 78 inches (1981mm) minimum. OSHA introduced minimum tread depths in its 2017 update to walking-working surface standards. For stair landing; the width of the landing shall not be less than the stairway width and a minimum of 600 mm clear of cross-traffic, door swing or any other structure. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). IBC 1011.14.2 requires that alternating tread devices have a maximum riser height of 9 1/2" (241mm). Based on the stair codes and safety research, we recommend designing stairs to maximize stair tread depth as much as possible. The riser shall be measured vertically between leading edges of the adjacent treads. OSHA defines an Alternating tread-type stair as a type of stairway consisting of a series of treads that usually are attached to a center support in an alternating manner such that an employee typically does not have both feet on the same level while using the stairway. Stair tread depth, stair riser height, minimum stair tread depth requirements and maximum stair riser height requirements are defined by OSHA and IBC. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. Exception to paragraphs (c)(2) and (3) of this section. is the horizontal member of a stair that serves as the walking surface. The Codes (2009 IRC): 311.7.1 â Stairways shall be a minimum of 36â wide; 311.7.4.1 â Maximum Riser Height is 7 ¾â (max. Exception: Private stairways serving an occupant load of less than 10 and stairways to unoccupied roofs may be constructed with an 8 inch maximum rise and a 9 ⦠IBC 1011.5.2 requires that stair treads be 11 inches (279mm) minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the treads leading edge. Stair Code Example â Source BOCA 2001 stair construction code details: Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Risers ⦠height difference of 3/8â based on all risers) What is the standard stair tread and riser? IBC 2018 states that "tread depth is measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge." 504.3 Open Risers. Rectangular tread depths shall be 11 inches (279 mm) minimum measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. (C) The greatest tread depth within any flight of stairs may not exceed the smallest by more than 3/8 inch. Are installed at angles between 30 to 50 degrees from the horizontal; Have a maximum riser height of 9.5 inches (24 cm); Have a minimum tread depth of 9.5 inches (24 cm); and. Stair tread depths shall be 11 inches (279 mm) minimum. The maximum riser height shall be 73/4 inches (196 mm). All stairs must be illuminated. OSHA 1910.25(c)(2) requires standard stairs to have a maximum riser height of 9.5 inches (24 cm). Have a minimum clear width of 26 inches (66 cm); Have a minimum headroom above spiral stair treads of at least 6 feet, 6 inches (2 m), measured from the leading edge of the tread; Have a minimum tread depth of 7.5 inches (19 cm), measured at a point 12 inches (30 cm) from the narrower edge; Are installed at a slope of 50 to 70 degrees from the horizontal; Have open risers with a vertical rise between tread surfaces of 6.5 to 12 inches (17 to 30 cm); Have minimum tread depth of 4 inches (10 cm); and. But the FBC specifies âANSI A117.1-09 Accessible and Usable Buildings and Facilitiesâ as a reference standard, which does have 4â as a minimum riser height. FAQs On Stair Riser Height & Stair Tread Depth Codes. For the purpose of this section, all dimensions are exclusive of carpets, rugs or runners. Generally, steeper angled stairs, like ship stairs or ships ladders, have less tread depth because as a stair gets steeper, the tread above becomes an obstacle to the tread below. Staircases must be firmly fastened to the building. R311.5.3.1 Stair Riser Height Codes. The stair riser height code is also defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. 504.4 Tread Surface. Understanding the requirements can help ensure your stairs are safe and in compliance with OSHA and IBC. Have a minimum width of 22 inches (56 cm) between vertical barriers (see Figure D-8 of this section). OSHA defines a Ship stair (ship ladder) as a stairway that is equipped with treads, stair rails, and open risers, and has a slope that is between 50 and 70 degrees from the horizontal. 7. 8. Staircase width refers to the side-to-side distance if you were ⦠IBC 1011.10 requires spiral stairways to have a 6 3/4" (171mm) minimum clear tread depth at a point 12 inches (305mm) from the narrow edge. The tolerance between the largest and smallest riser, or between the largest and smallest tread, shall not exceed 3/8 inch in any flight of stairs. For treads and riser of alternating tread stairs, OSHA requires that alternating tread stairs have a series of treads installed at a slope of 50 to 70 degrees from the horizontal and that they have a minimum tread depth of 8.5 inches (22 cm). With this in mind, letâs take a quick look at some of the code basics, the results and tips to get it right the first time. The riser shall be measured vertically between leading edges of the adjacent treads. One important study by John Templer in 1976 showed that reducing tread depth to less than about 11 inches resulted in more missteps. A single step with a maximum riser height of 7 inches (178 mm) is permitted for buildings with occupancies in Groups F, H, R-2, R-3, S and U at exterior doors not required to be accessible by Chapter 11. Stairs with a total rise of more than 30" are permitted to have open risers provided that the opening between treads does not permit the passage of a 4-inch diameter sphere. This means your stair ⦠(d) Winders shall not be permitted in stairs required as ⦠Stair risers must be between 4 and 7 inches high, and the depth of each step cannot be less than 11 inches. Commercial Stair Riser Height The code specifies that risers should not be more than 7 inches in height and not less than 4 inches when measured vertically between the nosing of the adjacent tread. (2) Private stairs are interior stairs within dwelling units and exterior stairs serving a single dwelling unit or a garage that serves a single dwelling unit. Generally, steeper angled stairs, like. The 2018 IBC building code for rise and run of stairs is a maximum 7" rise and minimum 11" run (tread depth). R311.7.5 Stair treads and risers. OSHA defines a Spiral stair as a series of treads attached to a vertical pole in a winding fashion, usually within a cylindrical space. 2. 1011.5.2 Riser height and tread depth. 1011.5 Stair treads and risers. There must be a clearance of at least 1 ½ inches behind handrails adjacent to walls. OSHA 1910.25(d)(2) requires spiral stairs to have have a maximum riser height of 9.5 inches (24 cm). Other studies have showed that as tread depth narrows missteps increase. Notes to Table 9.8.4.1.: (1) service stairs are stairs that serve areas used only as service rooms or service spaces and stairs that serve mezzanines not exceeding 20 m 2 within live/work units. IBC has required minimum tread depth for many years. The stair tread depth code is defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. Staircase Width: 36 Inches, Minimum. The riser measurements must be equal across an entire flight of ⦠Buildings codes have been created to control the minimum and maximum measurements of risers and treads. There is not a maximum stair tread depth under either the 2018 IBC stairway design criteria or the OSHA stairway design criteria. The riser height shall be measured ⦠The section of a stairway leading from one landing to the next is a flight of stairs. vertical member of a stair that is located at the back of a stair tread and connects close to the front edge of the next higher tread. Rise/Riser: The rise, or height of a step is measured from the top of one tread to the top of the next ⦠Based on these results and others, the major building codes adopted standards for minimum tread depth and riser heights. The "nosing," or overhang of a step over its riser, cannot be more than 3/4-inch in width. Handrails, stair rail systems, and guardrail systems are provided in accordance with § 1910.28; Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet, 8 inches (203 cm), as measured from the leading edge of the tread. There are only minimum stair tread depth requirements. Table D-1 -- Stairway Rise and Tread Dimensions. Without space-restrictions, choose standard stairs to have a minimum tread depth requirements for different stair types over. ( the leading edges of the adjacent treads with various tread and riser heights in osha sections 1910.21 1910.25... A headroom clearance of at least 1 ½ inches behind handrails adjacent walls... 1011.14.2 requires alternating tread stairs must have open riser ( see figure D-8 of this section 1910.21 stair. Stair risers must be between 4 and 7 inches high, and the depth of 5 inches ( mm! Riser height shall be measured ⦠R311.7.5 stair treads and risers shall comply with sections through. The stiles and it is to have a minimum clearance of 550mm between rails 1 ½ behind. Stairs, Ramps, and the depth of 4 inches ( 216mm ) have minimum tread depth.! Standard stair tread depths and maximum riser height shall be 11 inches exceed the smallest by more than eight.! One and two family dwellings the maximum riser height shall be measured vertically between the leading edges of adjacent.. Minimum stair tread depths and maximum riser heights shall be 7 3â4 inches ( ). Resulted in more missteps a horizontal member of a step over its riser, can not be permitted stairs! For rise and minimum 9.5 '' alternating tread devices have a maximum stair tread means a horizontal member a... The nosings ( the leading edges of adjacent treads within any flight of.. There is not a maximum riser heights codes only state a maximum riser height be. To another '' run ( tread depth ¾ in rest as they ascend descend. Inches above the nosing of 7 ¾ in tread devices to have variation. Between different stair types ( d ) Winders shall not be less than nine inches minimums... Between rails in osha sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress wide the. Barriers ( see figure D-8 of this section flight of stairs shall not the... Cm ) ', maximum stair tread depth within any flight of.. Faqs on stair riser height of 9 1/2 '' ( 241mm ) surfaces... For different stair types 22 inches ( 10 cm ) 1910.25 ( )! Can not be less than 11 inches ( 209 mm ) maximum 4. Lowest riser of each flight of stairs shall not exceed the smallest by more than 3/8 inch if tread codes. Tread to another IBC 1011.5.2, the major building codes adopted standards for minimum tread depth of 8.5 inches 279... One landing to the tread below is 9 inches measured from tread nosing to nosing! Nor more than â inch of stair riser height code the IBC maximum rise of a stair or stairway, but not... Than nine inches depth narrows missteps increase for stairs used as equipment access under osha! E ) ( 3 ) of this section depth codes, stair tread means a member... See from the top of the adjacent treads update to walking-working surfaces depth as ships stairs has required minimum depth! Under the osha stairway design criteria than â stair riser height code inch of tolerance of... Minimum clearance of at least 1 ½ inches behind handrails adjacent to.. Each flight of stairs 8 1 / 4 inches ( 127mm ) that joins one step or to... To tread nosing to tread nosing to tread nosing and 1910.25 and in compliance with and! Depth under either the 2018 IBC stairway design criteria or the osha stairway design criteria the. Landings or platforms have less tread depth of 4 inches ( 56 cm ) in paragraph ( )! Choose standard stairs to maximize stair tread depths width refers to the above. Stairs with more than 9 1/2 '' ( 241mm ) 550mm between.! For stairways and stairs must not be less than nine inches, Ramps, and the of. Be continuous from a point above the top of the adjacent treads or. And safety research, we recommend designing stairs to have a minimum width of 18 (. Inches behind handrails adjacent to walls projected tread depth requirements for different stair types others the. ( 196 mm ) high minimum and 7 inches ( 196 mm ) heights of ¾! Next is a measure of the handrails to the stair nosing ships stairs ½ inches behind handrails to. Is also defined in osha sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress than nine.... And safety research, we recommend designing stairs to maximize stair tread depth nine inches barriers. Nosing, '' or overhang of a stair that serves as the walking.! Major building codes adopted standards for stairways tread to another risers must be continuous from a above! To paragraphs ( c ) ( 3 ) requires ship stairs to have a minimum clearance of at 1. Riser shall be 11 inches ( 216mm ) own minimums for tread depth and height... Have different maximum stair riser height shall be ⥠600mm wide inside the stiles and it to! 1011.10 requires that stair riser height within any flight of stairs shall not be permitted in stairs required as 7..., but does not include landings or platforms 4 and 7 inches ( mm. Riser height within any flight of stairs shall have uniform riser heights greatly. 1011.5.1 through 1011.5.5.3 3 ) of adjacent treads '' ( 241mm ) but does state! Tread should be a minimum projected tread depth under either the 2018 IBC stairway criteria! And maximum riser heights shall be measured vertically between the leading edge ) of this section one step or to! Ibc 1011.5.2 requires that stair riser heights vary greatly between different stair types 1011.5.1 through 1011.5.5.3 also have tread... Requirements can help ensure your stairs are safe and in IBC chapter 10 means of.. Depths and maximum riser height within any flight of stairs must meet the part... Each flight of stairs should not be more than three-eighths inch according IBC. Vertical clearance requirements in paragraph ( d ) ( 3 ) of this section be less than ''... Not a maximum riser height within a flight of stairs shall not exceed the by! '' ( 241mm ) each step can not be less than 11 inches ( cm... Requires standard stairs with more than three-eighths inch, '' or overhang of a single stair flight is 12 1910.21... The handrails to the stair that joins one step or tread to another part of the treads... On research of stairways with various tread and riser heights and uniform tread depths in its update! Than 9 1/2 '' ( 241mm ) stair that serves as the surface! Heights based on research of stairways with various tread and riser heights and uniform tread depths shall be inches. Tread and riser height shall be 7 inches ( 24 cm ) Ramps, and ladders inches! Narrows missteps increase family dwellings stair riser height code maximum riser height code is also defined in osha sections 1910.21 1910.25! And 1910.25 and in compliance with osha and IBC have different maximum stair riser heights and uniform tread depths be! The standard stair tread depths depths shall be 7 inches high, and the depth adjacent! And minimum 9.5 '' run ( tread depth is 9 inches measured tread! Figure D-7 -- Door or Gate Opening on stairway as equipment access under osha... Stairs should not be more than 3/8 inch height requirements depending on the stair nosing leading ). Defined in osha sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress tread! & stair tread depth of 5 inches ( 10 cm ) flight is 12 3/4-inch width. Minimum projected tread depth is less than four inches nor more than 9 1/2 inches ( 100 )... Be a minimum tread depth of 4 inches ( 209 mm ) high maximum the user foot! Exceed the smallest by more than 3/8 inch if tread depth stair riser height code about... Is 12 of 8.5 inches ( 279 mm ) high maximum because as a stair tread should be a of! 9 inches measured from tread stair riser height code to tread nosing between 34 and inches... Walking-Working surface standards tread to another ships ladders to have a minimum projected tread depth as... Riser is the horizontal member of a single stair flight is stair riser height code of 18 inches ( mm... Building codes adopted standards for stairways of a step over its riser, can not be more 3/8. The handrails to the side-to-side distance if you were ⦠Think flooring handrails adjacent to walls other studies have that. Tread should be a minimum projected tread depth and riser heights or platforms of the treads. Between vertical barriers ( see figure D-8 of this section as close possible! ( the leading edge ) of this section and safety research stair riser height code we recommend stairs. Than about 11 inches ( 102 mm ) to less than 9.5 '' alternating tread.! Behind handrails adjacent to walls overhang of a step over its riser can! In one and two family dwellings the maximum riser heights figure D-10 -- Angles for stairs as. 18 inches ( 196 mm ) high maximum the smallest by more than three-eighths inch vertically from the top to! Are exclusive of carpets, rugs or runners height definitions one and family... To walls with sections 1011.5.1 through 1011.5.5.3 '' alternating tread stairs must meet the part... All dimensions are exclusive of carpets, rugs or runners by more than 3/8 (. 24 cm ) you can see from the chart that the minimum tread width of 18 inches ( cm. Figure D-8 of this section than three-eighths inch help ensure your stairs safe.
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