We have a 1920 craftsman (I say this because it is a single story home). We believe the roof vent stack / drain is clogged in the bathroom. The bathroom sink runs fine. The bathtub drains very slowly and at times the toilet gurgles and loses water when other appliances are used like the dishwaser, kitchen sink, washing machine. We have snaked out 20 feet and still happening.
We have called 6 plumbers in our area (Everett, WA) and none of them go on the roof.
First, can anyone confirm if this sounds like a correct diagnosis?
Second, is there a trick to find a plumber that goes on the roof to clean out the vent / drain? or is there another professional that is quailified to do this?
Thanks for all of the input!