Hi - 1st time posting here!
I replaced ~33' of 3" house sewer ABS DWV in a friend's house back in September. He has had repeated sewage back-up in this drain over the past three years. Once sewage exited his vent stack (~six years ago).
I installed a 1/4" pitch per foot on the new 3" drain, ran water through it for 1 hour, and it ran clear & effectively drained. My friend checked the drain about three weeks ago and there was a small quantity of sewage back up from the horizontal clean out.
A plumber drain-scoped the street-side/municipal drain two years ago and did not find any blockage/roots/etc. There is no backflow valve on the DWV.
Any insight/opinion/solutions would be greatly appreciated.
THX!
FYI: The drain drops about 3-1/2' to exit through the wall to the street DWV; the street DWV is about 3' above the basement floor. There is a Y connection from a sewage sump pit connected about 18" above the street DWV and an air cheater/cheater vent from the sump pit.
I replaced ~33' of 3" house sewer ABS DWV in a friend's house back in September. He has had repeated sewage back-up in this drain over the past three years. Once sewage exited his vent stack (~six years ago).
I installed a 1/4" pitch per foot on the new 3" drain, ran water through it for 1 hour, and it ran clear & effectively drained. My friend checked the drain about three weeks ago and there was a small quantity of sewage back up from the horizontal clean out.
A plumber drain-scoped the street-side/municipal drain two years ago and did not find any blockage/roots/etc. There is no backflow valve on the DWV.
Any insight/opinion/solutions would be greatly appreciated.
THX!
FYI: The drain drops about 3-1/2' to exit through the wall to the street DWV; the street DWV is about 3' above the basement floor. There is a Y connection from a sewage sump pit connected about 18" above the street DWV and an air cheater/cheater vent from the sump pit.
