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Commercial stair tread depth as for rectangular stair treads the depth should not be less than 11 inches when measured horizontally between the vertical plane of the foremost projection of the adjacent tread and at a right angle to the tread s nosing.
Commercial stair tread dimensions. Assuming the minimum width of 36 inches the floor space used by these stairs is 57 75 square feet. Stairways guardrail and handrails. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs. Stair tread depths shall be 11 inches 279 mm minimum.
There are also codes in place for standard stair tread dimensions. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum. The tread depth td is to be 185mm and it should not be more than 30mm shorter than the going g. Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.
A uniform flight of stairs provides a safety factor. Stair details refer to the standard requirements for each of the various components of a flight of stairs. 1009 3 stair treads and risers. Regulated by building codes stair details specify the sizes of risers and treads stair widths the placement of handrails and guardrails and construction methods for fabricating stairs.
All risers and all goings in the same flight of stairs shall be of uniform dimensions within a tolerance of 5 mm. The code lists specifications for width and height of stair tread. The stair riser code is up to 7 75 inches and can not vary more than 3 8 of an inch. However local specifications may override the dimensions so it is important to check with your local building authority before building or remodeling a staircase.
The riser height shall be measured vertically between the leading edges of adjacent treads. Home articles commercial stair design guidelines criteria and dimensions after seeing the popularity of my post on residential stair design i thought it made sense to explain the guidelines from the 2006 international building code for commercial buildings and common stairs in buildings with more than two dwelling units. In order to access a 12 foot high platform an ibc stair would need 21 steps 7 inch rise 11 inch tread making the entire horizontal run of the stairs 19 25 feet.
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