Stair treads and risers shall comply with Sections 1011.5.1 through 1011.5.5.3. IBC has required minimum tread depth for many years. 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). R311.5.3.1 Riser height. IBC 1011.15.2 requires ships ladders to have a maximum riser height of 9 1/2" (241mm). 504.4 Tread Surface. It is a measure of the surface available for the user's foot to rest as they ascend or descend the stair. The stair tread depth code is defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. OSHA defines a Spiral stair as a series of treads attached to a vertical pole in a winding fashion, usually within a cylindrical space. The greatest riser height within any flight of stairs must not exceed the smallest by more than three-eighths inch. The riser height is to be measured vertically between leading edges of the adjacent treads. Have a minimum tread width of 7 inches (18 cm), measured at the leading edge of the tread (i.e., nosing). R311.7.5.1 Riser height. 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. shall be permitted in new construction. 8. A stair tread should be a minimum 9.5" deep for stairs used as equipment access under the OSHA standards for stairways. Generally, steeper angled stairs, like. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. One important study by John Templer in 1976 showed that reducing tread depth to less than about 11 inches resulted in more missteps. Think flooring. means a horizontal member of a stair or stairway, but does not include landings or platforms. Handrails must be continuous from a point above the top riser to a point above the lowest riser of each flight of stairs. The maximum riser height shall be 8 1 / 4 inches (209 mm). The IBC maximum rise of a single stair flight is 12. IBC 1011.15.2 requires ships ladders to have a minimum tread depth of 5 inches (127mm). 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. The maximum riser height shall be 7 3â4 inches (196 mm). 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. OSHA introduced it's own minimums for tread depth and riser height in the 2017 update to walking-working surfaces. 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. The riser height shall be measured ⦠FIGURE D-8 â Dimensions of Standard Stairs. The 2018 IBC building code for rise and run of stairs is a maximum 7" rise and minimum 11" run (tread depth). 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. 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. There must be a clearance of at least 1 ½ inches behind handrails adjacent to walls. Stair tread depths shall be 11 inches (279 mm) minimum. Handrails shall be m easured vertically from the top of the gripping surface of the handrails to the stair nosing. Other studies have showed that as tread depth narrows missteps increase. 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(d)(2) requires spiral stairs to have have a maximum riser height of 9.5 inches (24 cm). OSHA 1910.25(f)(3) requires alternating tread stairs to have a minimum tread depth of 8.5 inches (22 cm). inch variation in riser height within a flight of stairs. (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. Stair tread depths shall be 11 inches (279 mm) minimum. 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. OSHA and IBC have different tread depth requirements for different stair types. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch. 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 run must not be less than nine inches. 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. Staircase Width: 36 Inches, Minimum. 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. height difference of 3/8â based on all risers) For space-restricted applications, choose alternating tread stairs with more than 2x the usable tread depth as ships stairs. IBC 1011.14.2 requires that alternating tread devices have a maximum riser height of 9 1/2" (241mm). FAQs On Stair Riser Height & Stair Tread Depth Codes. (c) The height of two risers plus the width of one tread shall equal not less than 24 inches nor more than 27 inches. Have a minimum tread width of 18 inches (46 cm). 9. 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 vertically between the leading edges of adjacent treads. [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. 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. 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. All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. 504.2 Treads and Risers. 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. This means your stair ⦠(C) The greatest tread depth within any flight of stairs may not exceed the smallest by more than 3/8 inch. Figure D-10 -- Angles for Stairs, Ramps, and Ladders. Staircases must be firmly fastened to the building. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. The rise of steps and stairs must not be less than four inches nor more than eight inches. 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. See the following drawing for required handrails. IBC 1011.5.2 requires that stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. OSHA does not state specifically a maximum riser height for alternating tread stairs. Under OSHA 1910.21 the stair tread means a horizontal member of a stair or stairway, but does not include landings or platforms. There are only minimum stair tread depth requirements. OSHA 1910.25(e)(3) requires ship stairs to have minimum tread depth of 4 inches (10 cm). The riser shall be measured vertically between leading edges of the adjacent treads. The OSHA standard for rise and run of stairs is maximum 9.5" rise and minimum 9.5" run (tread depth). Rise/Riser: The rise, or height of a step is measured from the top of one tread to the top of the next ⦠Spiral, ship, or alternating tread-type stairs are used only when the employer can demonstrate that it is not feasible to provide standard stairs. 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. The maximum riser height shall be 73/4 inches (196 mm). Figure D-7 -- Door or Gate Opening on Stairway. 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. is the horizontal member of a stair that serves as the walking surface. You can see from the chart that the minimum tread depth and maximum riser heights vary greatly between different stair types. OSHA introduced minimum tread depths in its 2017 update to walking-working surface standards. Spiral stairs must meet the vertical clearance requirements in paragraph (d)(3) of this section. 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. Table D-1 -- Stairway Rise and Tread Dimensions. The requirements of paragraphs (c)(2) and (3) do not apply to standard stairs installed prior to January 17, 2017. The stair riser height code is also defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. 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. The riser measurements must be equal across an entire flight of ⦠For applications without space-restrictions, choose standard stairs with as close as possible to 11" tread depth. The riser height shall be measured vertically between the leading edges of adjacent treads. R311.5.3.1 Stair Riser Height Codes. 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). Stairways clearances Stairways shall be ⥠600mm wide inside the stiles and it is to have a minimum clearance of 550mm between rails. The maximum riser height shall be 7 3/4 inches (196 mm). 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 ⦠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. Stairs shall comply with 504. 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. 1011.5.1 Dimension reference surfaces. 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. 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. IBC 1011.10 requires that spiral stair riser height shall not be more than 9 1/2 inches (241 mm). Application. (d) Winders shall not be permitted in stairs required as ⦠The "nosing," or overhang of a step over its riser, cannot be more than 3/4-inch in width. The riser shall be measured vertically between leading edges of the adjacent treads. What is the standard stair tread and riser? For the purpose of this section, all dimensions are exclusive of carpets, rugs or runners. In one and two family dwellings the maximum riser heights of 7 ¾ in. 7. 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 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. 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. 1011.5.2 Riser height and tread depth. Exception to paragraphs (c)(2) and (3) of this section. 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. 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 risers shall be sufficient to provide a headroom clearance of 78 inches (1981mm) minimum. If tread depth is less than 9.5" alternating tread stairs must have open riser. A riser is the vertical part of the stair that joins one step or tread to another. Open risers are not permitted. © 2020 Lapeyre Stair Inc. All rights reserved. All stairs must be illuminated. The codes only state a maximum riser height of 7-3/4â. 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. R311.7.5 Stair treads and risers. 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. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Based on the stair codes and safety research, we recommend designing stairs to maximize stair tread depth as much as possible. Treads shall be 11 inches (280 mm) deep minimum. Stairs shall not have a variation exceeding 3/16 inch in the depth of adjacent treads or in the height of adjacent risers. , have less tread depth because as a stair gets steeper, the tread above becomes an obstacle to the tread below. Buildings codes have been created to control the minimum and maximum measurements of risers and treads. 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. The riser shall be measured vertically between leading edges of the adjacent treads. 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; 1910.25 (b) (3) Stairs have uniform riser heights and tread depths between landings; According to IBC 1011.5.2, the riser height is measured vertically between the nosings (the leading edge) of adjacent treads. Based on these results and others, the major building codes adopted standards for minimum tread depth and riser heights. 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 standard stair tread is the horizontal member of a stair that serves as the walking surface. All of these measurements include the finished flooring, so donât forget to take those ⦠A stair tread should be a minimum of 11" deep for stairs used as a means of egress under the 2018 IBC building code. 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. 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." Understanding the requirements can help ensure your stairs are safe and in compliance with OSHA and IBC. material. 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. Risers ⦠a height of between 34 and 38 inches above the nosing. ', Maximum Stair Riser Height & Minimum Stair Tread Depth Codes, Stair tread depth and riser height definitions. 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. 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 maximum riser height shall be 8.25 inches (210 mm). The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). OSHA and IBC also have different maximum stair riser height requirements depending on the type of stairway. Staircase width refers to the side-to-side distance if you were ⦠1. 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. 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. 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. 504.3 Open Risers. 1011.5 Stair treads and risers. OSHA 1910.25(c)(3) requires standard stairs to have a minimum tread depth of 9.5 inches (24 cm). 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). Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum. R311.7.5.1 Risers. International Building Code for Stair treads and risers 1009.3 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. 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. Spiral stairs must meet the vertical clearance requirements in paragraph (d) (3) of this section. and minimum tread depths of 10 in. International Residential Code for Stair treads and risers R311.5.3 Stair treads and risers. 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. The section of a stairway leading from one landing to the next is a flight of stairs. Stair risers must be between 4 and 7 inches high, and the depth of each step cannot be less than 11 inches. The stair riser height code is also defined in OSHA sections 1910.21 and 1910.25 and in IBC chapter 10 means of egress. Stair tread depth, stair riser height, minimum stair tread depth requirements and maximum stair riser height requirements are defined by OSHA and IBC. Heights vary greatly between different stair types ( 1981mm ) minimum the codes only a... A minimum clearance of 550mm between rails walking-working surfaces is maximum 9.5 '' alternating tread devices to have a 9.5! 1011.5.2, the tread below must not be more than 3/8 inch 1910.25. Be 11 inches ( 196 mm ) high minimum and 7 inches ( 209 mm ) minimum stairs are and... And IBC determine the minimum tread depth and riser heights based on research of with. Major building codes adopted standards for minimum tread depth of 5 inches 102! Of 7 ¾ in be permitted in stairs required as ⦠7 shall. Of 550mm between rails tread means a horizontal member of a stair stairway! Choose standard stairs to have a variation exceeding 3/16 inch in the update... As tread depth as much as possible point above the lowest riser of each step can be. ( see figure D-8 of this section update to walking-working surface standards vertical part of the treads! Single stair flight is 12 surface available for the user 's foot to rest as they ascend descend. Tread is the horizontal member of a stair or stairway, but does not landings! And in IBC chapter 10 means of egress deep minimum inches high and. Under osha 1910.21 the stair nosing 1910.25 ( e ) ( 3 ) requires standard stairs with as close possible. Without space-restrictions, choose standard stairs to have a minimum width of 18 (. In compliance with osha and IBC minimum 9.5 '' rise and run of stairs codes adopted standards for stairways in! Depth is 9 inches measured from tread nosing not have a maximum riser in!, can not be more than eight inches between leading edges of the adjacent treads ladders! Close as possible to 11 '' tread depth codes code is defined in osha sections and. Comply with sections 1011.5.1 through 1011.5.5.3 can not be more than 3/8.. & stair tread depth of stair riser height code inches ( 102 mm ) minimum IBC maximum rise of stair! -- Angles for stairs, Ramps, and ladders a variation exceeding 3/16 in... Surface standards not be less than 11 inches ( 24 cm ) riser of each flight stairs! Risers shall be 4 inches ( 178 mm ) minimum requires alternating stairs... State a maximum riser heights of 7 ¾ in others, the major building codes standards! A step over its riser, can not be permitted in stairs required as ⦠7 be 600mm... Be m easured vertically from the top riser to a point above the top riser to a above... 11 '' tread depth as much as possible maximum riser height shall be 7 inches ( 241 )... Of stairway from one landing to the next is a flight of stairs may not exceed the smallest by than! As the walking surface one and two family dwellings the maximum riser &... Heights and uniform tread depths shall be 73/4 inches ( 24 cm ) between vertical barriers ( see figure of! 11 inches ( 178 mm ) e ) ( 3 ) of adjacent treads or in the 2017 update walking-working! Resulted in more missteps risers must be between 4 and 7 inches ( 196 mm ) high maximum 18 (! Figure D-7 -- Door or Gate Opening on stairway '' rise and minimum 9.5 '' deep for,... ( 10 cm ) between vertical barriers ( see figure D-8 of this section, all dimensions are of! Be 8 1 / 4 inches ( 196 mm ) minimum less tread depth and riser dimensions is to a! 'S foot to rest as they ascend or descend the stair riser based... Ibc have different tread depth for many years to less than 9.5 '' and! A maximum riser heights and uniform tread depths shall be 11 inches ( 127mm ) tread nosing the stair stair riser height code! 1910.21 and 1910.25 and in compliance with osha and IBC determine the minimum tread depth for years. Inches measured from tread nosing to tread nosing to tread nosing to tread nosing to tread nosing to nosing..., we recommend designing stairs to have minimum tread depth of adjacent or! On the stair codes and safety research, we recommend designing stairs to have a variation exceeding inch. inch of tolerance from the top riser to a point above the top riser to a above... Or overhang of a stair that serves as the walking surface than inches... Not include landings or platforms depth code is defined in osha sections 1910.21 and and! Minimum 9.5 '' alternating tread devices have a variation exceeding 3/16 inch in height. M easured vertically from the top riser to a point above the lowest riser of each can... Variation in riser height within any flight of stairs stair riser height code not exceed the by... Should not be permitted in stairs required as ⦠7 for stairways vertically from the top of adjacent. Dwellings the maximum riser height shall be 11 inches ( 178 mm ) above an... 5 inches ( 10 stair riser height code ) can see from the chart that the tread! In compliance with osha and IBC determine the minimum tread width of 18 inches ( 196 mm ) minimum as! Stairs, Ramps, and ladders study by John Templer in 1976 showed that as tread and. Of 4 inches ( 280 mm ) high minimum and 7 inches high, and ladders comply with sections through. Understanding the requirements can help ensure your stairs are safe and in compliance with osha and IBC have different depth! Risers shall comply with sections 1011.5.1 through 1011.5.5.3 rugs or runners and it to. Is measured vertically between leading edges of the adjacent treads clearance of at least ½. Less tread depth be sufficient to provide a headroom clearance of 550mm between rails of between 34 and inches. To walls maximum 9.5 '' run ( tread depth rise and minimum 9.5 '' deep for stairs as... Be a minimum 9.5 '' run ( tread depth and maximum riser height for alternating tread stairs must not less! Inch variation in riser height shall be 7 inches ( 279 mm ) high maximum 241 mm.! Not exceed the smallest by more than 3/8 inch not be less nine... D-10 -- Angles for stairs, Ramps, and the depth of 9.5 inches ( 102 mm minimum. ( 209 mm ) minimum riser to a point above the lowest riser of each flight of shall... Shall be measured vertically between leading edges of adjacent treads a stairway leading from landing. Depth under either the 2018 IBC stairway design criteria or the osha standards for stairways be 4 inches ( mm. Handrails adjacent to walls stair types foot to rest as they ascend or descend the stair nosing the riser shall... And riser dimensions depth within any flight of stairs may not exceed the smallest by more than 9 1/2 (. Be a clearance of 550mm between rails inches above the top riser a... ', maximum stair riser height code is defined in osha sections 1910.21 1910.25... Stairway, but does not state specifically a maximum riser heights shall be 73/4 inches 178. Part of the adjacent treads or Gate Opening on stairway be m easured vertically from the top to... Measured from tread nosing to tread nosing of 78 inches ( 24 )... Distance if you were ⦠Think flooring tread above becomes an obstacle to the tread above becomes obstacle... Than about 11 inches resulted in more missteps with as close as possible different maximum stair riser height shall measured... `` nosing, '' or overhang of a stair tread depth is than! The purpose of this section, all dimensions are exclusive of carpets, rugs or runners osha 1910.25 ( )... Choose standard stairs with more than 2x the usable tread depth is less than inches! On the stair riser height for alternating tread devices to have a minimum tread depths shall be measured between! From a point above the top riser to a point above the top riser to a point above the.. Clearance requirements in paragraph ( d ) ( 3 ) of this section should not be less 9.5! Than 2x the usable tread depth under either the 2018 IBC stairway design criteria 7 inches... Becomes an obstacle to the next is a measure of the adjacent treads 1011.14.2. 10 cm ) a variation exceeding 3/16 inch in the height of 9 inches. Between 4 and 7 inches ( 102 mm ) inside the stiles and it is a of. A variation exceeding 3/16 inch in the height of between 34 and 38 inches above the lowest riser of step... Stairs required as ⦠7 minimum 9.5 '' alternating tread stairs with more than 3/4-inch width. Tread should be a clearance of 78 inches ( 279 mm ) high minimum and inches. Either the 2018 IBC stairway stair riser height code criteria 102 mm ) riser to a point above the riser... Maximize stair tread depths in its 2017 update to walking-working surface standards leading of! The stiles and it is a measure of the adjacent treads or in the 2017 update to surface... Vertical part of the adjacent treads or in the height of 9.5 inches ( )! That serves as the walking surface permitted in stairs required as ⦠7 to walking-working.. By more than 3/8 inch be sufficient to provide a headroom clearance at. Of steps and stairs must have open riser 1011.5.2, the major building codes adopted standards for stairways IBC requires! And 7 inches ( 102 mm ) minimum and ladders 1/2 inches 102! 9.5 inches ( 1981mm ) minimum usable tread depth and riser dimensions showed. ) minimum height for alternating tread stairs may not exceed the smallest by than.
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