Standard Stair Tread And Riser Size

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. 8 1 4 to 9 stair tread thickness. A uniform flight of stairs provides a safety factor.

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However the americans with disabilities act ada lists the minimum tread size as 11 inches which would be the effective minimum and likely the average size of the tread for any stairs built for public use.

Standard stair tread and riser size.

The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3 8 inch. Required 1 to 1 1 2 projection beyond the riser face. Harvard university lists typical tread sizes between 8 and 11 1 2 inches. Stair tread run or horizontal depth.

1 or greater tread is supported by the riser. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs. Standard stair tread dimensions. Here is a drawing detailing our standard stair tread and riser dimensions.

Additionally the riser measurement of all of the treads should be as close as possible to identical. Stair details refer to the standard requirements for each of the various components of a flight of stairs. Name a z. Details are at stair tread dimensions.

Definition of detailed specifications for open riser stairs. These dimensions may be useful when laying out a staircase or if you have general questions about the size and shape of a traditional tread or a retro tread. A stairway in which there is a noticeable variation between the risers is a safety hazard. Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.

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