Stair Tread Rise And Run

Find the rise and run of a 37 sloped stairway or a 37 angled stair click to enlarge any image if stairs are built with a 37 stairway slope what would be the step rise rise x if we use an 11 inch deep stair tread.

Stair tread rise and run.

Definition of stair run rise definition of stairway run. Its length is measured from the outer edge of the step which includes the nosing if it is present to the vertical portion of the stair called the riser. The run of a stairway is the total horizontal distance traveled by a walker using the stairs from the face of first riser to the face last riser. Tread and rise calculation staircase calculation formula is total required number of risers total stair rise height of one rise 60 6 10 riser total required number of tread total stair tread or run width of one tread 90 10 9 tread.

For anyone not familiar with the terms rise refers to the vertical distance from the top of one tread to the top of the next tread. In a given run of stairs the greatest step height and the smallest step height should not vary more than 3 8 inch 9 5 mm. Open risers with openings more then 30 inches 762 mm vertical to the floor should not permit the passage of a 4 inch diameter 102 mm sphere. An intermediate tread is 12.

Staircase tread run depth. Per most building codes the tread should be between 9 5 and 14. The horizontal distance of one stair. An intermediate run is 11.

This is a measurement from the nose of the tread to nose of the tread. The run or tread is the part of the stairway that a person steps on. The tread depth is the distance from the front edge or nosing a tread projection that overhangs the riser below of one step to the front edge or nose of the next step measured horizontally. It also happens to be the dimension of one of the cuts on each of the actual stair stringers the framing members that hold up the stair treads.

The run however seems to cause some confusion. The stair tread is the run plus the nosing. Both nosing and riser are discussed below. Risers the step height f is the typical height of each step.

It is equal to the number of treads multiplied by the typical tread depth b. It is how far in the stair goes which gives the amount of room for a persons foot. 10 to 11 inches minimum a step tread is the flat horizontal surface that you walk on. Code states that this should not be greater than 7 3 4 inches 194 mm.

The run should be between 8 5 and 14. Tangent or tan is the reverse of arctan. 37 slope converts to 75 3 or in decimal form a slope of 0 7535. The irc code does not allow a distance greater than 7 of an inch from one step tread to the next.