Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
Staircase tread size.
Stair tread dimensions measaurements step construction details code specifications.
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.
Typically there are three in a staircase.
It has a 1 in.
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.
One on each side and.
A stair stringer is a structural member that supports the treads and risers of a staircase.
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.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
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.
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.
Here is a drawing detailing our standard stair tread and riser dimensions.
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.
In width and accommodates tread runs up to 11 1 2 in.
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.
It will fit stairs up to 48 in.
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.
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.
Thickness and is sold unfinished allowing you to finish it to match other stair parts or decor.
Standard stair tread dimensions.
Unit run is carefully considered based on both safety and cost.
Building regulations for stairs uk.