How to Install a Precut Deck Stair Stringer

Written by cameron easey
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Pre-cut stringers are a good choice to use on a deck because stringers will not need to be manually cut from 2-by-12 boards. Proper measurements from the deck to the ground are necessary to determine how long the stringers for the deck must be. Install a pre-cut deck stair stringer by first measuring and then cutting the stringers to the correct length needed for your deck.

Skill level:
Moderate

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Things you need

  • Tape measure
  • Pencil
  • Straight edge
  • Circular saw
  • Joist hanger
  • Power drill
  • Lag bolts
  • Socket wrench

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Instructions

  1. 1

    Measure from the top of the decking to the ground with a tape measure to determine the total rise for the staircase.

  2. 2

    Divide the total rise, in inches, by the riser height of the pre-cut stringer to determine how many risers you will need.

  3. 3

    Count the number of risers you need on the pre-cut stringer and make a mark with a pencil. Use a straight edge to draw a straight line across the stringer.

  4. 4

    Trim the stringer to the needed length by cutting along the line you drew with a circular saw.

  5. 5

    Set the stringer up to the deck and secure it temporarily with a joist hanger.

  6. 6

    Drill two to three holes on the backside of the rim joist, on the deck, into the end of the stringer with a power drill.

  7. 7

    Insert lag bolts into the holes you drilled into the rim joist and tighten them with a socket wrench.

  8. 8

    Attach additional stringers by following the above steps.

Tips and warnings

  • Pre-cut stringers typically have a riser that measures 6¾ inches.
  • Stringers will not set properly if the ground is not flat.

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