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Re: Main Waste under footing?
Joshua,
Attached is one structural engineers design for when a pipe goes through a footing. This one relieves the pressure "around" the pipe as the pipe actually "goes through the footing" (not under it, and not through a foundation wall). The "relieving arch" effect, though, is required so that no load from above is placed on the pipe.
There are other design which are more like 'arches' for when the pipe goes "under" the footing (instead of through the footing as in the attached).
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