Vent pipe size thru roof

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George R

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Adding a new 1/2 bath, just a sink and a toilet. The vent for the sink (1 1/2") and the vent for the toilet (2") will join together in the attic and then exit the roof. These vents are not tied in to any other vents in the house. Can this vent exit the roof as 2" or does it need to be increased to 3" before protruding. No inspection in this town, however, I do want to do it correctly.
 

George R

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Central Illinois. It gets cold here.

HA! Never heard the term hoar frost before. Looked it up on wikipedia, and learned all kinds of new things. Thanks HJ.
 
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