Staircase risers should be adequately deep to allow a majority of your foot to have enough room to rest on the stair.
Minimum stair tread size.
Harvard university lists typical tread sizes between 8 and 11 1 2 inches.
The greatest depth at the 12 inch mark must not exceed the smallest on any other tread by more than 0 375 inches.
Handrail height to be placed a minimum 34 inches to 38 inches.
Handrail graspability to be either type i or ii with a minimum 1 1 2 inch clearance from a wall.
The stair tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at right angle to the tread s leading edge.
This distance must be at least 10 inches.
This is because stair treads can be crafted from thick oak to think stainless steel.
As general rules of thumb for achieving comfortable relationships between riser and tread dimensions the following formulas can be used.
Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing.
The riser height shall be measured vertically between the leading edges of adjacent treads.
There isn t one unifying rule for every kind of material stair treads may be built out of.
The minimum tread size is commonly stated as 9 inches for residential construction.
However if the steps do not have nosings and the steps have solid risers not open risers the minimum tread depth is 11 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.
Stair tread depths shall be 11 inches 279 mm minimum.
The minimum general tread depth remains 11 inches but it is measured at a right angle from the leading tread edge that is 12 inches from the narrowest side.
Stair tread depths shall be 11 inches 279 mm minimum.
This narrow side must have a minimum tread depth of 10 inches.
Buildings codes have been created to control the minimum and maximum measurements of risers and treads.
The stair tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at right angle to the tread s leading edge.