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Thread: Another venting question

  1. #1
    DIY Member Willie Two's Avatar
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    Default Another venting question

    When going across to the main stack to vent the bathroom sink. Can the vent pipe go inside the water wall cavity ( it's 2 x 8 ) instead of through the top plate / insulation and then across to the 3 " stack in the attic? Assuming it is well above any fixture drains. It's not a wet vent. Thanks

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Default

    Sure, the common rule is that any horizontal vent piping needs to be at least 6" above the flood rim of the lavatory and pitched towards the drain.

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