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Old 03-16-2018, 08:34 PM   #10
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
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Join Date: Feb 2005
Location: Oak Creek, WI
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Usually when you cut into a slab for plumbing work, you go out of your way to make sure the new patch is well supported from below so it doesn’t drop in elevation. For starters, you generally fill the void left by dirt with stone material that doesn’t like to compress. After packing that in place, you use re-bar like Jim said and pour concrete of an equal depth to the existing slab.

I’d be nervous that your dirt fill is nowhere near as compacted as the surround soil. Did you go out of you way to compact the dirt as you filled?

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