Hey guys. I bought an older house that has no main vent going out through the roof. Whenever the washing machine drains on medium or large, air backs up into the toilet. I recently replumbed all the washer hookups and added a trap and an AAV. However it did not fix the problem. Do I need to add another AAV somewhere, or a main vent line? If so, where on the line?
/e excuse my awesome drawing skills.
/e excuse my awesome drawing skills.
