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New construction plumbing problem


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Double combination or double wye would work fine- I hope the vanity is about four feet high. In real life I probably wouldn't make them change out a double sanitary tee.

How would one fire-stop that cavity if it was a closet?

The double wye would force the connection to the vent to below the weir of the trap. A double T "combo" would have been the best choice.

If they used a wye then they would have to take the vent connection off the top of the horizontal drain and run it up and over to the stack

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The double wye would force the connection to the vent to below the weir of the trap. A double T "combo" would have been the best choice.

Which is why I made the four foot high vanity comment. The trap arms are so high that I doubt they'll be able to make any connection.

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How would one fire-stop that cavity if it was a closet?

If it were a closet it would have a finished interior. Is Jeff going to make sure the ceiling between those two walls is covered? If the plumbing and electrical penetrations are required to be sealed it seems silly to ignore the gap in the wet wall.

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