The result was a disastrously uncomfortable stair with treads too short for adult feet.
Standard stair tread sizes.
Typically there are three in a staircase.
Rise r 8 run r 9 1 4 r r 17 1 4 good 2r r 25 1 4 almost perfect stairs will be comfortable.
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.
Stair tread depth is more of an issue for descending rather than ascending stairs.
Length most stair treads are not made to wrap around the lip of the stair.
We include a table giving standard access ramp ladder and stair specifications for slope angle and rise run measurements for stair treads for various types of stairs ramps and ladders.
Mike guertin s prohome adjusted dimensions.
On the first stairs i built i sized them for a 1 8 riser and a 2 8 tread.
Stair treads come in a variety of colors styles shapes and sizes.
The maximum deflection shall be l 100 or 40mm whichever is the lesser over the horizontal span l of the stairway between supports.
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.
Because they only sit on the top of the stair the length of the tread is limited to the size of the average step.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
Here is a drawing detailing our standard stair tread and riser dimensions.
Standard stair tread dimensions.
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.
Further the tread measurement of every tread in a stairway should be as close as possible to identical.
One on each side and.
The greatest tread depth within a flight of stairs cannot be more than 3 8 inch larger than the smallest tread depth.
Most stair treads measure between 8 and 10 inches long with longer treads being used on.
We describe how to translate the stair rise and run into a specific number of stair treads and risers that will be uniform and of proper safe dimension.