No vent stack - possible?
We've been living in a house for 3 years and have been doing some remodeling throughout. It appears that there is no venting system in the house. There are 3 toilets, 4 sinks, and 2 showers, however we cannot find a vent stack anywhere. My roofer noticed this when he took off the old roof - he found that there were pipes coming out the roof, but they weren't attached to anything in the attic. I once had a plumber look around, and he couldn't find any vents in the attic. We have also searched the attic extensively within a 5-foot radius of each toilet, and found nothing. Is it possible that my house has no vent system? It was built in 1959 and an addition (including 2 bathrooms and a new kitchen) was built in 1974 (I should mention that the addition was built by people who seemed to cut corners in every way possible), and the house is on the city sewer system. All of the fixtures in the house seem to drain fine, but it seems that many people believe that this would be impossible without a proper venting system. Also, the (1 inch) drain for the washing machine in the garage sits loosely in a 2 inch PVC pipe just sticking out of the ground - I don't see a trap, and if you listen closely to the pipe, you can hear water moving when someone is showering/flushing a toilet. I suppose you could call this a type of vent. But, there are no strange smells anywhere. Finally, we also can't find a cleanout anywhere outside of the house. Given the year the house was built/remodeled, should it have one?