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Old 09-30-2011, 12:24 PM   #1
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Through roof vent size.


Can I reduce my 4" main stack to 3" before it goes through the roof? I have/will have 4 sinks, two toilets, two showers and two floor drains all vent via this stack.

I want to do this for roof collar size and cosmetic reasons. I think I also heard that it can prevent frost buildup.

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Old 09-30-2011, 12:57 PM   #2
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Through roof vent size.


Vent size should not be decreased.
Vents are increased to allow for frost build up

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Old 09-30-2011, 12:59 PM   #3
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Through roof vent size.


Thank you!
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