Plumbing venting

Old 08-14-02, 09:22 AM
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Plumbing venting

I am installing a small sink in my basement and will be connecting the drain to the main drain. Does anyone have any suggestions on venting I vave heard of a automatic venting valve and also the posssiility of using a technique called reventing
Old 08-14-02, 08:37 PM
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Automatic venting valves are allowed in some areas and prohibited in many more. Call your building department and check.

Reventing (aka a back vent) will work, but you need to connect into an existing dry vent (i.e., not one through which water ever passes) at a point above the highest fixture it currently serves (i.e., somewhere on the floor above).

You may connect your drain into the main horizontal drain (probably under the floor), but you may not connect to one of the vertical drains serving the floor above.

Be sure to go over your plans with your building department before beginning.
Old 08-21-02, 01:59 PM
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I wonder what is the reason you can not tap into a vertical waste line that serves the floor above?

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