Plumber sawed through my I-beam joist to make room for a toilet waste pipe.
11 years later I find the toilet, flooring and subfloor all failing because of the sag in the floor, created by sawing through an I-beam joist that runs the length of the house. The joist was cut to make room for the PVC waste pipe for the toilet. Only a small section in the Master Bath is affected but it looks like I will have to pull the vanity, cut out of old sub flooring and figure out how to support that section of the floor where the toilet will rest, once all the repairs are done. It's possible I might be able to sister up about a 14 foot length of joist to the I-beam that's been sawed through. Is that the best way to go? What about the sag?