Proper ventillation is one of the most important factors in your roof lasting it's full lifespan, looking great for decades, and not creating black mold issues in your attic or crawl space. Not only d ... read more
Sounds like inadequate venting for the drain lines. Could have been build this way or maybe a clog has developed in the vent pipe. Such as birds or squrrels building a nest in the vent pipe up on the ... read more