I am working on an addition with plans supplied by the owner. The plans called for a two story walk out bay window. Because of an additional 6″ bump out behind the bay the total projection is about 30″. The first floor is doug fir 2×8 12″ O.C. cantilevered under the bay. The second floor joists are perpendicular to the first floor and add very little load. The bay has about an 8′ total width. Today I noticed that the bay seems to have sagged just a bit (less than a 1/4″ in 30″) and Im concerned about it getting worse. Unfortunately I wasn’t paying close attention to it when we were framing but now realize that the majority of the load is on the outside corners of the bay. I am thinking about ripping LVL’s down to 7-1/4″ and sistering them to the joists on the outside corners after jacking up the bay.