How Can You Avoid Over Cutting The Area on A Stair Stringer Where The Tread Meets The Riser With A Circular Saw?

The only way you can avoid over cutting this area of the stair stringer with a circular saw will be to stop before you reach the end and finish the rest with a handsaw.

Would something like this weaken the structure of the stair stringer, I imagine it would, but don't think it's as big of a deal as some carpenters make it out to be.

What you're looking at in the picture above is the way I've been cutting stringers for years, yet I rarely cut more than is needed. As a matter of fact the picture below is what most of my stair stringers look like, on the other side.

Obviously I didn't have the time to whip out a handsaw, during production framing, but if this is a concern of yours, then feel free to cut until you're about an inch away from the corner, where the bottom of the riser meets the back of the tread, on the stair stringer layout.

Then you can simply cut the rest with a handsaw or Sawzall.

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