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Old 11-16-2011, 10:57 PM   #1
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Venting my home

Building a new three story house. Four inch pipe coming up through the floor in basement, after i tie in all my fixtures to this four inch pipe can I reduce it to two inch and carry it out through the roof as a vet stack?


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Old 11-17-2011, 01:25 AM   #2
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Venting my home

Codes differ in different regions. I need the combined cross sectional area of all my vents to equal the cross sectional area of my building drain. So if your taking a 4" drain out of the house you need the equivalent of 4" through the roof. This may be achieved with multiple vent pipes. Such as 4- 2" vents.
Also, vents are sized by the fixtures they serve. I doubt you could put a 3 story house on a 2" vent.


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Old 11-17-2011, 08:43 AM   #3
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Venting my home

Depends on code where you live. I could not do it but maybe you can.
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Old 11-17-2011, 11:06 AM   #4
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Venting my home

Is the vent pipe PVC, copper, cast iron -
What's the apprx. outside, width of the pipe?

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Old 11-17-2011, 09:17 PM   #5
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Venting my home

I would not reduce vent eplumber said it size is based on fixture units that it supplies and a 2" vent would only supply as a releif vent for one water know commode.....most codes don't allow reducing stack must go same size through roof...Ben
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