# Question: How Long Of A 2×12 Do I Need For Stairs?

## 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 much length do you need for a staircase?

You must also figure in a minimum three-foot landing or clear floor area at the bottom of the steps. For an eight-foot wall height, figure on a 14-foot long footprint for a straight staircase. If you have nine-foot high walls on the first floor, your total height is 119 and 1/8 inches.

## Should I use 2×10 or 2×12 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.

## What is the formula for building stairs?

The vertical distance between the floors to be linked by the staircase is the principal determinant of the riser and tread dimensions. 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).

## Can I use 2×8 for stair stringers?

If your first tread steps down from the deck, you must extend the rim joist to create a solid surface below the deck rim to attach it to. You should attach 2×6 or 2×8 support framing under the rim flush to the bottom of the stringer. … Mark the location for each stair stringer. Most wood stairs use 16″ on center.

## What size should stair stringers be?

The minimum tread depth is 10″ and the maximum riser height is 7-3/4″. The Stairs Calculator will also provide you the length of the 2×12 stair stringer you will need to use and the angle of the stairs.

## Can I use 2×12 for stair treads?

Stair treads may be made of a single 2×12, but are often made of two decking boards or 2x6s. A stringer is a wide board, usually a 2×12, that runs at an angle from the landing pad to the deck framing and supports the treads. … – The stair treads should be at least 36 inches wide.

## How long of a board do I need for stair stringer?

In a set of stairs 36 inches wide, there are typically three stringers (one on each end and one in the middle). The stringer length is the tip-to-tip length of the cut stringer. It is used to determine the length of 2×12 material required to build the stair stringer.

## What size lumber should I use for stair stringers?

2x12sAlways use straight, high-quality, pressure-treated 2x12s for stair stringers. If you are planning on resting the stringer on the ground, make sure the wood has . 60 RET level. You want the crown side of the board to be on the cut side.