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Posted by BobK207 on December 15, 2006, 2:00 pm
Wayne Whitney wrote:
>
> > Can re-route the sink vent such that it shares the tub vent roof
> > penetration?
>
> Certainly it is OK to merge the vents in the attic and use a single
> roof penetration. Note that horizontal segments should be pitched
> like a drain so that condensation runs back towards the fixture.
>
> As to the size of a merged vent, a 1.5" vent can handle 8 fixture
> units according to the UPC. A lavatory is 1 fixture unit and a
> bathtub is 2 fixture units, so a single 1.5" vent is adequate. I see
> a footnote in my reference that the UPC requires that vents be
> increased one pipe size if the horizontal length exceeds 1/2 the
> vertical length.
>
> I assume that there is another vent elsewhere that is the full
> diameter of the house drain? This is required.
>
> Yours, Wayne
Thanks for all the replies......
No fixtures in attic....thanks for the heads up about condensation
drainage, "horizontal" run is about 6' but will follow 8/12 roof line
Wayne...."stacked" bath rooms have toilets with seperate vents that
merge in the attic to a single 4" roof penetration...I assume that's
what you meant by
>>another vent elsewhere that is the full diameter of the house drain
cheers
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