Ken Meyer Posted June 17, 2011 Report Posted June 17, 2011 All of the old DWV piping in the house has been replaced with ABS except for a 3' or so section of the waste stack vent through the roof. Aside from the fact that the cast iron section is unsupported and distorting the neoprene reducing fitting, is it acceptable to reduce the waste vent stack like this? Click to Enlarge 42.74 KB Click to Enlarge 42.89 KB
Brandon Whitmore Posted June 17, 2011 Report Posted June 17, 2011 It depends on what the vent serves. Unless they re- configured the DWV system at some point, the vent is probably under- sized.
David Meiland Posted June 18, 2011 Report Posted June 18, 2011 Is it typical to upsize the vent going through the roof? Climate here is similar and we don't do that. Looks to me like someone was just lazy and left the top of the cast iron, without supporting it, and now it's crushing the rubber. It may survive a while but it sure lacks class.
Brandon Whitmore Posted June 18, 2011 Report Posted June 18, 2011 Is it typical to upsize the vent going through the roof? Climate here is similar and we don't do that. Looks to me like someone was just lazy and left the top of the cast iron, without supporting it, and now it's crushing the rubber. It may survive a while but it sure lacks class. No, not normal at all. Is it normal for folks in snow country-- I thought I heard that somewhere? The main stack would have originally been cast iron, and it's goofy to have not replaced just the small top section. Ken may have gotten lucky....had they replaced the entire thing, he may not have had a clue that the vent is/may be improperly sized.
Ken Meyer Posted June 18, 2011 Author Report Posted June 18, 2011 The plumbing was all done with a permit, but the permit is still open, they never got the final. So I recommended having a plumber come out & support the section of cast iron, and advised the home buyer to get the work inspected and a final permit issued.
John Kogel Posted June 18, 2011 Report Posted June 18, 2011 I think when that rubber boot finally lets go, there will be a heck of a crash up in the attic. The cast iron pipe has dropped, so the flashing up on the roof should be checked as well. If that is still the main stack, it should probably be 3" ABS all the way, but it really depends on what is being vented. What Brandon said.
Jim Katen Posted June 18, 2011 Report Posted June 18, 2011 Is it typical to upsize the vent going through the roof? Climate here is similar and we don't do that. Looks to me like someone was just lazy and left the top of the cast iron, without supporting it, and now it's crushing the rubber. It may survive a while but it sure lacks class. No, not normal at all. Is it normal for folks in snow country-- I thought I heard that somewhere? Yes, to prevent frost closure.
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