abrahuang
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I took out the old cast iron pipes this weekend, and put together another dry fit. I have both first floor bathroom and the on-going basement bathroom. The basement shower-tub need a vent, but I don't know I should vent through a new revent to roof or anywhere in the existing waste-vent in basement. I learnt the code requires a vent above at least 6" of the highest fixture, but is it only required when critical distant was exceeded? Some plumber told me I need a revent for the first-floor sink, but I don't think the sink to vent distant exceeded critical distant. For safe, I cut out a section of vent pipe in attic and inserted a double Tee, made ready for at leas one 1 1/2 revent pipe whenever needed.
Overview picture:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118770661953697250
Upstream view:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118770683428533746
Tee for revent in attic:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118759160031278530
Overview picture:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118770661953697250
Upstream view:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118770683428533746
Tee for revent in attic:
http://picasaweb.google.com/abrahuang/HouseBasementPlumbing/photo#5118759160031278530