# What is the correct term for long cuts in a floor joist?

I would like to identify the correct term for a long, lateral cut within a floor joist.

Based upon this guide and several other sources that I have come across, a notch is a cut that is allowed to have a width up to $\frac{1}{3}$rd of the depth of the floor joist. In other words, a 9" joist can have a notch cut in it up to 3" wide.

In my particular case, I would like to make a cut several feet long in order to increase the available head room. I would like to know the correct term so I can research joist reinforcement requirements.

Bonus points for providing additional references regarding US building codes related to this type of a modification.

In my experience, this is called a rip. I've seen it done a lot (on the top of a beam section) to accommodate flooring thicknesses/slopes. Your reference actually mentions this, although briefly, on the first page under When a Notch Becomes a Rip.