If you are in fact getting some backflow from the sewer outlet, I would probably spend the money to have a drain cleaning company come out and camera the piping before you break up the floor.
Yes, I did what Mr. David mentioned and I did get some backflow from the sewer outlet. Why would hiring a drain cleaning company in order to come out and camera the piping make sense? Could there be something other than a down-grade in the main sewer line?
Because if there is a partial blockage in the line causing some water to remain in the sewer pipe , it would be easier to have that cleared before you go through the process of breaking out the floor to fix backfall on a pipe that doesn't have backfall. Over the years I have learned to gather as much information as reasonably possible before making blind stabs at fixing a problem. A sewer camera with an operator who knows what they are looking at is one of the best sources of information in this type of situation.
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