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.
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Things you need
- Tape measure
- Straight edge
- Circular saw
- Joist hanger
- Power drill
- Lag bolts
- Socket wrench
Measure from the top of the decking to the ground with a tape measure to determine the total rise for the staircase.
Divide the total rise, in inches, by the riser height of the pre-cut stringer to determine how many risers you will need.
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.
Trim the stringer to the needed length by cutting along the line you drew with a circular saw.
Set the stringer up to the deck and secure it temporarily with a joist hanger.
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.
Insert lag bolts into the holes you drilled into the rim joist and tighten them with a socket wrench.
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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