Step 6 · Trim the Bottom of the Stringers

The bottom of each stringer often has a triangular waste piece. You need to trim this off to create a flat surface. The amount to trim depends on your specific layout, but it's typically a straight cut across the bottom edge of the stringer where the lowest tread will sit. This ensures the stringer sits flush and supports the first tread properly. Measure and mark this trim cut accurately on all stringers.

Tools and Materials