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Digging trench in floor

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  • Digging trench in floor

    Getting mixed messages. One contractor said they can dig one long trench along a wall to install a drain and fill in with steel supports and concrete. One contractor said you have to leave parts of original floor slab in place for support (tunnel under to install drain). Is one right? How do I protect the foundation of my house if I have a drain system put in?
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