**The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm)**. Looking at the definition of stairway and flight, you can see that the the 3/8″ variance only applies to individual flights of stairs, and not the entire stairway.

## Can the top step be a different height?

Per the latest edition of the 2012 International Residential Code (IRC), **the maximum allowed difference in riser height is 3/8″**. (This means that the difference in height between the tallest and the shortest riser on your stairs can be no more than 3/8″.)

## Do all steps need to be the same height?

Additionally, **the riser measurement of all of the treads should be as close as possible to identical**. The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3/8 inch. A stairway in which there is a noticeable variation between the risers is a safety hazard.

## How do you calculate landing height for stairs?

Quote from the video:

Quote from Youtube video: *And that will be to simply divide the overall height or the total rise of the stairway. Or the distance. Between the top of the lower level.*

## What is the 18 rule for a staircase?

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 do you fix an uneven stair riser?

Quote from the video:

Quote from Youtube video: *Then if it's off a little too far just take the stair stringers apart take the stairway apart. And recut a stair pattern cut a new stair pattern.*

## What is the ideal stair riser height?

In the United States, the step height standard should be **between 7 or 7 ¾ inches at the most, and no less than 4 inches**. You should follow other measurements if given by local building codes. In Canada, the maximum step riser height is 8 ¼ inches.

## What is the maximum rise on a staircase?

Stair and Staircase Building Regulations Explained

1. | The maximum rise for any step is 220mm (min. 150mm) | |

2. | The minimum going of any step is 220mm (max. 300mm) | |

3. | The maximum pitch is 42° | |

Private (domestic) Staircase | Going = 220 min; Rise = 220 max; Pitch = 42° max. | |

Utility stair | Going = 250 min; Rise = 190 max |

## Do stairs need level?

**Stair treads themselves must also be close to level**, as you’ll see in the following standards: 1995 CABO 314.2 allows a maximum 2% slope on stair treads themselves – this is the slope of the tread surface, not the slope of the stairway.

## 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). The IBC maximum rise of a single stair flight is 12.

## How many steps before a landing is required?

ADA Stair Landings

– A landing is required **every 12′ of vertical stairway rise**.

## Is 45 degrees too steep for stairs?

**A stair at a 45-degree angle is not allowed by code due to the maximum riser and minimum tread standards**. The maximum riser allowed by the International Residential Code (IRC) is 7-3/4”, but a 7-3/4” tread is smaller than the minimum tread depth of 10”.

## What is the preferred slope of staircase?

The typical stairs slope for steep stairs varies **between 50 and 70 degrees**. Steep stairs like ship stairs, spiral stairs, and alternating tread stairs have typical slope between 50 degrees and 70 degrees to save space. The steeper slope shortens the horizontal run of the stairs so they take up less space.

## What is the formula for the slope of stairs?

Slope of staircase is calculated by trigonometric formula that is Tanθ which is equal to ratio of opposite to adjacent in a right triangle such as Tanθ = opposite/adjacent, and **θ = tan^-1 (opposite/adjacent)**, and this value of theta (θ) will give us slope of staircase in degrees.