Plumb Cut - Building And Rough Framing

A plumb cut is any cut made by a saw that runs in a vertical direction (up and down). The black arrow in the picture below is pointing to a plumb cut at the end of the stair stringer that is attaching to a cantilevered floor joist.

Don't confuse a plumb cut with a cut that's made at a slight angle. A plumb cut would represent any cut that was made at a 90° angle from the building foundation. A good example of this would be almost every individual stair riser, except for those with undercuts.

Whenever you hear a carpenter refer to or use the word plumb, they are referring to something that is vertically level. This would be something that was perfectly Straight in an up-and-down direction.

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