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What are standard stair Dimensions?

What are standard stair Dimensions?
Have you ever wondered what the average width of residential stair tread was?
The general rule for standard stair dimensions that is accepted by many general contractors and stair designers  is known as the "7-11" rule. This means the rise is 7 inches and the run is 11 inches. This rule can be applied to any staircase design,  it's 11 inches and that would consist of a 10 inch run in the individual stairway and a 1 inch overhang or 1 inch undercut. 11 inches provides most users with a comfortable step.
-The width of the stairs should be 3 ft 6 inches. The wider they are the better because they are safer. Standard stairs handrails have to be more than 44 inches wide.
- Professionals recommend that every staircase should present a landing at every 12 feet (at least).
- The angle that the staircase makes with the surface of the ground  should be at least 30 degrees and no more than 50 degrees.
- A nosing is the edge portion of the tread that exceeds the dimension of the riser. According to standard dimensions, nosing should be less than 1 ½ inch
- The handrail is the element that runs parallel to the staircase; it’s used by people to maintain their balance ascending and descending the staircase , It should be a minimum of 36″ above the nosing of the tread. The space between the wall and handrail should be no more than 1 5/8″.