FAQ

How to Build Deck Stairs

The first step to building deck stairs is to determine the Total Rise of the stairs. The most common way to do this is to place one end of a level on your deck …

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How do you build basic deck stairs?

Are stair stringers 2×10 or 2×12?

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.

What is the formula for deck stairs?

To find the least number of steps for your deck, measure your deck height in inches at the stair location. Then divide by seven point eight seven five. You will get a whole or decimal number. Round down if it is a decimal and round up if it is a whole number.

How do you attach stairs to a deck?

Do deck stairs need footings?

SAFE, SUPPORTED STAIRS: Deck-stair construction varies, but the general requirements are consistent: proper footing support, and an adequate landing. 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.

How do you calculate stair stringers?

Take the total height of your stairs divided by the number of steps. This will give you the exact height you should cut each rise in your stair stringer boards.

What size boards do you use for deck stairs?

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.

What size lumber do you use to make stair stringers?

2x12s

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.

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.

How do you cut stringers for deck stairs?

What is a good 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.

How many stringers do I need for deck 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.

How do I anchor my deck stairs to the ground?

Can I use joist hangers for stair stringers?

Use joist hangers to fasten the blocking. Pros: Allows for the use of all types of stair stringer hangers. The top of the stair stringer acts as the first tread instead of being flush with the deck’s surface.

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.

Do deck stairs have to land on concrete?

Do Deck Stairs Need a Landing? All exterior staircases are required by code to have landings at the bottom and top to make sure it is safe and there is plenty of room for doors to swing, and for people to use.

How deep should a footing be for stairs?

Dig a trench about 125mm deep for the footing for the first riser.

What should I put on the bottom of my deck steps?

Like any solid structure, your steps need a stable foundation. There are many options when it comes to footings for your deck steps, from concrete and gravel to patio stones and even grass. … Footings with Different Deck Stair Landing Options

  1. Concrete landing pad.
  2. A wood box-type landing pad.
  3. Crushed stone.
  4. Patio Blocks.

How do you figure rise and run for stairs?

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