I’m replacing my old cast iron plumbing. However before my sewer line exits the house there’s a “y” fitting that’s directly under my footing. Is it alright to trench under my footing to fit a reciprocating saw? The ground is very hard clay soil. I just don’t want to do anything to jeopardize the structural integrity of the house. Also any suggestions for soil compaction if i go ahead with this. I was possibly thinking of filling the hole with concrete after.
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You should be fine. Masonry naturally distributes loads in an arch or triangle around weakened areas. Of course there are limits to this, but for what you're proposing I wouldn't expect an issue.