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I'm replacing a shower drain. I notice some people cut the foundation with a concrete wet saw before they jack hammer the foundation to get through it. Others, don't. Is there a benefit to cutting the foundation first?

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It helps to confine the breakage to a more defined area, by providing a stress concentration and weak point at the edge of the area you want to remove.

A side effect is that because it concentrates the stress, it makes breaking out the chunk you want easier (the force is not distributed to the whole slab if it hits a cut line and starts making cracks below it.)

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  • Yep, it's basically like nibbling out a notch cut on a tile using a wetsaw, instead of trying to notch it using pliers or something.
    – Huesmann
    Commented Jun 25, 2023 at 13:14

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