How To Layout Bottom of Stair Stringer

In this section you're going to learn the basics, but keep in mind that adjustments and further calculations will need to be made.

For example, you will need to deduct certain measurements off of the bottom of the stair stringer, while laying it out, in order to make the first step in the stairway, the same riser height as the rest of the steps in the stairway..

This method also won't apply to every stairway, so keep this in mind. More on this later.

The black arrow in the illustration above is pointing to the tread width measurement mark on the framing square.

For our example it is 10 inches.

After you have lined up the width of the stair tread or step, with the second riser line and double checked all of your measurements, feel free to mark the first riser.

Then you're going to use the first riser line, to line up the framing square to mark the bottom of the stair stringer.

The arrow in the illustration above is pointing to the riser measurement mark on the framing square. Make sure you have made the necessary calculations and adjustments, for any additional material that will be added to the stair steps and flooring, before marking or cutting the stair stringer.

After you have the framing square in the exact location, mark the bottom of the stair stringer.

When you're all done you should end up with something that looks like the illustration above. Click on links below for more information about how to layout the bottom of stair stringers for other applications.

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