How do you calculate stair risers?

How do you calculate stair risers?

  1. There are four main components that need to be considered when measuring a staircase: Rise, Run, Width, and Headroom.
  2. To determine the number of risers in the staircase take the total height between floors, in inches, and divide by 8.25.
  3. In a straight staircase, there will always be one fewer stair tread than riser.

How do you calculate the number of treads and risers?

From the above Diagram,

  1. The staircase has divided into two flights providing a landing slab at mid of the staircase height.
  2. So Number of Riser = Height of Staircase / Height of one Rise.
  3. = 1500/150.
  4. = 10 Nos.
  5. So as per standard, we are providing 300 mm as tread length.
  6. Number of Tread = Length of Stair/One number of Tread.

What is the height of stair risers?

7 inches

How do I calculate how many steps I need?

So to calculate the number of treads (steps) you will need, we simply take the height to deck measurement and then divide this figure by 175 (rise height). We than take that final figure and subtract 1, as this final figure has given the total amount of rises and not total amount of treads.

What is the maximum height of a single step?

A step riser is the distance from the top of one step to the top of the next step, measured vertically. Risers must have a maximum variance of 0.375 inches between the highest and lowest risers on the staircase. Risers must have a maximum height of seven inches and a minimum height of four inches.

How tall is a normal step?

7 ¾ inches

What is code for step height?

International Residential Code (IRC) The IRC stairs code states that the minimum width for stairs be no less than 36 inches. The stair riser code is up to 7.75 inches, and can not vary more than 3/8 of an inch.

At what height is a step required?

The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.

What is the OSHA standard for steps?

Riser height shall be from 6 to 7.5 inches (15.24 to 19.05 cm), stair width a minimum of 22 inches (55.88 cm) between vertical barriers, tread depth a minimum of 12±2 inches (30.48±5.08 cm), and tread nosing shall be straight leading edges. Stair landings shall be at least 20 inches (50.8 cm) in depth.

What is the minimum depth of a step?

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. This distance must be at least 10 inches.

What is code for rise and run of stairs?

(c) Rise and Run. (1) The rise of every step in a stairway shall be not less than 4 inches nor greater than 7 1/2 inches. (2) The run shall not be less than 10 inches as measured horizontally between the vertical planes of the furthermost projection of adjacent treads.

What is a good width for stairs?

36 inches wide

What is the angle of most stairs?

around 37°

What angle do you cut stair stringers?

Determine how much run each stair will need. Your total run is the horizontal distance between the top and the bottom of the stairs. How far the stairs stick out can vary depending on your needs, but keep in mind that stairs should usually be at an angle of about 40 degrees.

How do you cut the perfect stair stringers?


  1. Clamp a guide to the square.
  2. Find the crown.
  3. Lay out the first tread and the second riser.
  4. Lay out the second tread and the third riser.
  5. Mark the back of the top tread.
  6. Mark the plumb cut at the top of the stringer.
  7. Lay out the bottom riser.
  8. Adjust the first riser height.

What size board is used for stair stringers?

Pressure-treated or cedar 2×10 or 2×12 can be used depending on the depth of the cut-outs you’ll be using. By code you will need a minimum of 3-1/2″ of material left on the stringer after the cut-outs and that area should also be free of large knots which would weaken the stringer.

How many stair stringers do I need?

The number of stringers you need is a function of the width of the staircase and the tread material. Cut stringers can be spaced no more than 18 inches on center, so a 3-foot-wide staircase needs three stringers, and a set of slightly wider stairs (say 3 feet 6 inches) needs four stringers.

How many stringers do I need for a 36 inch stairs?

If you have a stairway that’s 48 inches wide and you divide 16 inches into 48 inches, you will find that you need four stair stringers. If you’re stairway is between 30 and 36 inches you will need three stair stringers.

Do deck stairs have to land on concrete?

Stair landings must be at least as wide as the stair and at least 3 feet deep. On the other hand, solid, flat, and stable materials, such as concrete, flagstone, pavers, or brick, can be installed with a measurable slope and will not usually shift under the weight of an off-balance person completing a stairway descent.

How many stringers do I need for 40 inch stairs?

If you’re going to use a 4 x 12 stair tread, there’s a good chance you would only need one stair stringer at each end of the stairs, if you’re stairway was less than 40 inches wide.

How many stairs can you have before a landing?

Length of flight Stairs with more than 36 risers in consecutive flights should have at least one change in direction between flights. For buildings other than dwellings, the maximum number of risers between landings should be 16 for utility stairs and 12 for general access stairs. There should not be any single steps.

What is the minimum tread width for deck stairs?

36 inches

How long of a 2×12 do I need for stairs?

How to Use the EZ Stair Calculator. We suggest 10.5″ for 2×12 or 2 – 2×6 Treads. Treads may be cut to suit other widths.

How many stairs do you need to go up 10 feet?

It will yield a staircase with 14 risers. All staircases have one more riser than they do treads. This means you will have 13 treads for a total length of 130 inches or 10 feet 10 inches. You must also figure in a minimum three-foot landing or clear floor area at the bottom of the steps.

Begin typing your search term above and press enter to search. Press ESC to cancel.

Back To Top