Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs.
Standard stair tread and riser size.
8 1 4 to 9 stair tread thickness.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
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.
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 uniform flight of stairs provides a safety factor.
1 or greater tread is supported by the riser.
Standard stair tread dimensions.
Details are at stair tread dimensions.
Name a z.
The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3 8 inch.
A stairway in which there is a noticeable variation between the risers is a safety hazard.
Required 1 to 1 1 2 projection beyond the riser face.
Definition of detailed specifications for open riser stairs.
Additionally the riser measurement of all of the treads should be as close as possible to identical.