Summary: calculate the total width per floor you need by multiplying the occupant load by 0.3″ and in some cases 0.2″. Take the largest width that you calculate, and use it for the entire stairway system. Keep in mind, the minimum clear width is typically 44″, but it is sometimes reduced to 36″ for low-capacity floors.

How do you determine the width of a staircase?

Summary: calculate the total width per floor you need by multiplying the occupant load by 0.3″ and in some cases 0.2″. Take the largest width that you calculate, and use it for the entire stairway system. Keep in mind, the minimum clear width is typically 44″, but it is sometimes reduced to 36″ for low-capacity floors.

How much width should a staircase be?

3 feet wide
Staircase code states that stairs must be 3 feet wide or wider. As long as the 3-foot width standard is met, you can expand the stairs’ width as far as you wish.

How do I calculate staircase layout?

You divide the height by 7 inches; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14). Next, you divide the height by the number of treads (15 into 106), producing the exact tread height (7.06 inches).

What is code for rise and run of stairs?

What is code for rise and run of stairs? The 2018 IBC building code for rise and run of stairs is a maximum 7″ rise and minimum 11″ run (tread depth). The OSHA standard for rise and run of stairs is maximum 9.5″ rise and minimum 9.5″ run (tread depth).

How many square feet is 13 stairs?

You’ll need between 80 and 110 square feet for 13 stairs.

What is the normal size of staircase?

3 feet, 6 inches
The stair’s width usually varies depending on the type of building the staircase is in, but for a normal residence, the standard tends to be 3 feet, 6 inches (106.7 cm). The minimum, in most places, is 2 feet 8 inches (81.3 cm). If a staircase exceeds 44 inches (111.8 cm), handrails are required for both sides.

What is the normal rise and run for stairs?

The OSHA standard for rise and run of stairs is maximum 9.5″ rise and minimum 9.5″ run (tread depth).

What is a comfortable stair rise?

Rule one says that rise plus run (r+R) should equal 18 inches. Why? That’s what most people find to be a comfortable stride on most stairs. You can cheat a bit up or down, but below 17” and more than 19” will result in steps that require strides either too big or too small for most people.

How many square feet is 12 stairs?

54 square feet
For a typical set of 12 box stairs, you’ll multiply the 36” width by the 18” tread and riser, then multiply by 12 stairs. The total is 7776 square inches of carpet, which equates to 54 square feet.

Are stairs calculated in square footage?

Stairs: Runs/treads and landings both count in square footage totals. They are measured as a part of the floor “from which they descend,” so are generally counted twice in a typical two-story home with a basement.

What is the most comfortable stair rise and run?

With a riser height of 7 1/2 inches, tread width (run) should be at least 9 inches. Ten inches is a more comfortable run; when you multiply 7 1/2 inches by 10 inches, you get 75 — within the conventional ratio of 72 to 75 inches. With 14 10-inch treads, the total run of the stair will be 140 inches.