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.
Stair riser and tread size.
A landing is a platform between two flights of stairs.
Building codes generally suggest that the maximum height of a riser be 7 75 inches 19 7 cm nosing.
Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies.
The section of the tread that overhangs the riser below.
It has a 1 in.
It is also the approach space at the top and bottom of the stairs.
Thickness and is sold unfinished allowing you to finish it to match other stair parts or decor.
The tread is the horizontal section of each stair sometimes called the run.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
The nosing is the protrusion at the edge of a tread that hangs over the riser below.
Open riser stairs are allowed a back slope of at most 1 1 2.
Take a look at the sketch of stair specifications.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
The tread depth td is to be 185mm and it should not be more than 30mm shorter than the going g.
Open riser stair treads must be at least 1 1 2 thick because the tread not supported by a riser may otherwise split.
For convenience and flexibility this stair stringer calculator comes in two forms the automatic and manual click on the icons to determine the best calculator to use for your stairs.
It will fit stairs up to 48 in.
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.
A uniform flight of stairs provides a safety factor.
From stair treads stair railing and a complete selection of stair parts surewood lnl has what you need to make your stairs beautiful.
In width and accommodates tread runs up to 11 1 2 in.
Not all steps have a nosing but when.
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.
This is the surface that the user steps on.
The number of risers not the number of treads is used to determine the number of steps that comprise a staircase.
Here is a drawing detailing our standard stair tread and riser dimensions.
The stair calculator is used for calculating stair rise and run stair angle stringer length step height tread depth and the number of steps required for a given run of stairs.
All risers and all goings in the same flight of stairs shall be of uniform dimensions within a tolerance of 5 mm.