They are the height it needs to be in order to make the desired number of treads connect the low and high points. That being said, Stair risers should be no more than 8" and treads should be no less than 11". Once your risers start being taller than your tread is long, you are building a ladder, not a stair. If you start at 8" for a riser and 11" as a tread, By shrinking the riser and adjusting the treads to fit you can get the steps to work out so that one consistent riser height can be achieved. One that will be in the 6-8" range. If you use risers that are less than 6", you should lengthen the treads. Example problem--
Lower floor is 6 feet lower than the higher floor. Keep in mind you always have 1 more riser than tread.
6'-0"= 72"
You can make 18 each 4" risers (72"H /4"R=18 risers) and have a run of 34 feet using 24" treads.
or
you can make 12 each 6" risers and have a run of 11 feet using 12" treads.
or
you can make 9 each 8" risers and have a run of 7'-4" or 88" using 11" treads.
You will always have at least one "given"-the height you need to traverse. From there it is just division and multiplication based on the 8" maximum riser and the 11" minimum tread.
7 and 10 inches is fairly common. 7 inch rise and 10 inch tread. It just depends on what you have to work with. You have to adjust both for the space you have and the height. It might be 6 inch rise and 8 inch tread.
You should check your local building code or cal your local building official. For interior residential, the range should be between 7" and 7 7/8".
7"
trade and riser are the terms used for stair case. trade is used for the breadth of and riser is used for height of stairs.
Six foot and eight inches is usually code, but check codes locally.
The tread is what you step on, the riser is the part going up. Rise=riserThe tread is what you step on. The riser is the upright piece your toe hits.
The rise of a stair is the vertical distance between the treads. The term can be used for the height of the full set of stairs. A riser is the vertical board running along the front of the step.
The riser
Measure from the nose and the top of the tread of the plumb up the wall 34' to 36'
Minimum tread is 10" and maximum riser is 7.75".
Waka flacka. you do not step on the riser
There is no "standard" height of steps.Check your local building codes for minimums and maximums.Here in western Canada, the rise, or height of an individual stair, can vary from 125 to 200 mm (5" to 8").Your codes will also regulate such things as run (the horizontal size of the step), minimum stair width, head height over the stairs, distance between landings, handrail requirements, and so on.
No more than 1-1/4 inch.
Stair run is the length of the opening and the height of the opening
It's the vertical face that runs between the back of one step and the front of the one above it.