Ran across this situation today on a Warranty Inspection.
The picture show a plumbing vent in the attic. The vent runs horizontal for 20 - -25 feet across the attic to the vertical pipe that goes through the roof. Appeared to be plumbed to 4 incoming pipes.
First question: is this horizontal run allowed.
Second Question: The horizontal pipe appears to go downhill after the ‘tee’ fitting. So that in my opinion it would/could form a trap if rain water entered the vent from outside. I think you can see this in the first picture. This would be in need of repair, correct?
Third Question: If this setup caused the vent pipe to fill with water and form a trap, would that cause the attached fixture drains to drain slowly? The homeowner had showed me the last sink on the line and complained that it often seems to have a slow drain and backs up at the beginning of the inspection. It did not do it when I was there. It seems that intermittant blockage from rain water could explain this type of intermittant problem. Reasonable?
Any input or advice would be appreciated. Thanks in advance.
Last picture shows what appears to be an air conditioning duct. It does not appear to be installed properly. Maximum sag should be nor more than 1/2 foot per meter. That sag looks greater than that.
That is not a sag it is travelling down to the ceiling vent. Though sagging is not that uncommon around here with the soddy way the flex duct is installed.