#### How to build interior stairs

## What is the formula to build stairs?

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 the best rise and run for stairs?

shorten your stride to match the stairs will wear you out. Over the years, carpenters have determined that tread width times riser height should equal somewhere between 72 to 75 inches. On a main stair , the maximum rise should be no more than 8 1/4 inches and the minimum run should be no less than 9 inches.

## How many stringers do I need for interior stairs?

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 .

## Are stairs at 45 degrees?

For example, if you were crazy and built a staircase with a 12 inch tread and riser, then the angle of the stringer to the floor would be 45 degrees. A more common angle is about 37 degrees .

## 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 .

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

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.

## What is code for rise and run of stairs?

(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 the most comfortable angle for stairs?

around 37°

## What is the minimum rise of a step?

– The maximum allowable stair rise is 7 ^{3}^{/}^{4} inches, and the minimum stair rise is 4 inches. For recommendations on rise -run combos, see the tip below. – The difference between a stair’s longest and shortest riser height or stair depth should be no more than 3/8 inch.

## What is code for stair stringers?

The building code (IRC, R311. 7 Stairways) is strict regarding stair layout and includes the minimum tread depth (10 inches), the maximum riser height (7 3/4 inches in the IRC, but this can vary by state), the maximum variance (typically 3/16 inch) between riser heights in a given stairway , and more.

## Do stair stringers need support?

Yes, the stringers need to be supported along their length, but they can span a few feet too, depending on 1) the width of the stairs , 2) the number of stringers , and 3) size of riser board. 2) More stringers can span further because they’ll be carrying less load.

## How many stairs stringers do I need for 6 foot wide?

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 .