Maximum Stair Riser Height OSHA 1910 25 c 2 requires standard stairs to h ave a maximum riser height of 9 5 inches 24 cm IBC 1011 5 2 requires that stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum
Riser Height The typical range for residential riser heights is 7 to 7 75 inches 17 78 to 19 68 cm while for commercial buildings it s usually around 7 to 7 25 inches 17 78 to 18 42 cm 2 The maximum riser height is 7 75 inches with a similar maximum permitted variation of inch in any single stairway Risers must be vertical or have a maximum slope of 30 degrees from vertical Stair dimensional requirements from the 2021 IRC
Maximum Stair Riser Height
Maximum Stair Riser Height
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In Group I 3 facilities stairways providing access to guard towers observation stations and control rooms not more than 250 square feet 23 m2 in area shall be permitted to have a maximum riser height of 8 inches 203 mm and a minimum tread depth of 9 inches 229 mm Riser height should be a maximum height of 7 3 4 inch height There shouldn t be a height difference of more than 3 8 between the tallest and shortest riser If the stairs have open risers then anywhere above 30 from the floor should not permit a sphere of 4
The maximum riser height shall be 8 1 4 inches 209 mm The riser shall be measured vertically between leading edges of the adjacent treads The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3 8 inch The staircase riser height should be no more than 7 3 4 inches Measure the height of every stair in the staircase Stair heights can vary by no more than 3 8 inch Measure from the front edge or nosing of a stair tread backward to the stair riser The staircase tread depth must be at least 10 inches
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Section R311 Means of Egress in the IRC code states that staircases should have a minimum width of 36 inches Treads should have a minimum depth of 10 inches and risers a maximum height of 7 3 4 inches When it comes to commercial stair standards the International Building Code IBC establishes the minimum requirements for stairs to insure a level of safety to the public Several components are looked at such as stair width headroom riser and tread heights
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OSHA 1910 25 c 2 requires standard stairs to h ave a maximum riser height of 9 5 inches 24 cm IBC 1011 5 2 requires that stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum
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Riser Height The typical range for residential riser heights is 7 to 7 75 inches 17 78 to 19 68 cm while for commercial buildings it s usually around 7 to 7 25 inches 17 78 to 18 42 cm 2
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