# How To Build Steps On A Hill

## What is the formula for building stairs?

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## Do stairs need footings?

Regardless of the stair run and number of treads, the stairway needs a footing at the bottom to support the stringers—they can’t just rest on the ground. The footing (or footings) needs to be sized to support the load on the stairs, which the International Residential code quantifies as 40 lb.

## 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. 1) The wider the stair the more load will be transferred to the stringers.

## What angle should stairs be?

The standard angle of a staircase depends on the use case and application for the stair. For most standard stairs, the stair angle varies between 30 degrees and 45 degrees. Egress stairs have a shallower angle around 30-35 degrees while industrial stairs have steeper angles ranging from 40 to 70 degrees.

## What is the normal rise and run for 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.

## Can I use 2×10 for stair stringers?

It is acceptable and within building code guidelines to use either 2×10 or 2×12 dimensional lumber to create a set of stairs; however, a stair stringer should not be less than 3.5 inches wide at its narrowest point to provide adequate strength for the load the stairs will be supporting.

## How far apart should stair stringers be?

Stringers should be spaced no more than 36 inches apart from each other for maximum stair support, according to the International Association of Certified Home Inspectors. However, local residential codes may vary slightly, so check the building codes before building a staircase.

## What size lumber is used for stair stringers?

Stringers should always be cut from 2x12s. Notching smaller stock doesn’t leave enough wood to safely carry the loads of a stair. When ordering stringers, allow about 14 inches of stringer length for each step. Look for straight stock with as few knots as possible.

## What do you put under stepping stones?

What do you put under stepping stones? In order for your stepping stones to be stable, they should be laid on compacted soil, a fine aggregate such as decomposed granite and cushioning sand for leveling.

## What is the standard step height for stairs?

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.