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.
Staircase tread size.
Sketches photographs and examples of defects used in inspecting the step design on indoor or outdoor stairs and their treads including the requirements for a projecting stair tread nose and the tread nose shape and dimensions.
This page is part of the staircase design series.
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.
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.
It will fit stairs up to 48 in.
Unit run is carefully considered based on both safety and cost.
Here is a drawing detailing our standard stair tread and riser dimensions.
Thickness and is sold unfinished allowing you to finish it to match other stair parts or decor.
Typically there are three in a staircase.
Unit run is the horizontal measurement of from the front to the back of a single stair which is known as the tread standard code requires that each stair tread fall between 9 inches and 11 inches 22 9 cm and 27 9 cm to allow people to safely ascend and descend stairs.
Treads shall have a minimum live loading of 2 5 kpa or a 2 2 kn per linear metre or minimum point loading of 1 5 kn applied on 100mm 100 mm pad on each step whichever loading produces the more adverse effect.
A stair stringer is a structural member that supports the treads and risers of a staircase.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
In width and accommodates tread runs up to 11 1 2 in.
From stair treads stair railing and a complete selection of stair parts surewood lnl has what you need to make your stairs beautiful.
Stairs landing shall have a minimum live loading of 2 5 kpa and minimum point loading of 1 1 kn applied on 100mm 100mm pad.
Building regulations for stairs uk.
The tread size min 10ins 25 4cm is dictated by the average adult foot size although it is not necessary to be able to fit your entire foot on a tread in order for walking up the stairs to be both comfortable and safe.
This document provides building code specifications for stair treads.
Similarly handrails must be between 34 and 38 96 52 inches high measured from the top of the treads with a diameter between 1 25 inches 3 18 cm and 2 675 inches 6 79 cm.
Standard stair tread dimensions.
Stair tread dimensions measaurements step construction details code specifications.