Seeing if anyone can help, I just bought a house built in 1908. Half of the attic was a finished with plastered and deteriorated over the years due to a leaky roof, the other half of the attic was unfinished. I Just got a ne w roof on and recently Demo'd the plaster and ulitmatley pulling up the ton gue and groove subfloor to run new electrical to the 2nd floor. The joists are now exposed and I found a pipe in the floor that was once fully connec ted for radiant heating. With that said someone notched out the joists to cut across with the pipe and now when I stand directly on those joists (3 o r 4 of them) the floor beam feels pretty "spongy" now. I am wondering if t his is a cause for concern? And if so, can and should I sister a 2x6 to the existing joist for more support. Also a quick mention I plan on redrywall ing the room directly below this room (putting 1/2" drywall over top of the existing plaster). I should also say these joists will at a part in the floor where it is not walkable because I will be putting knee walls in. I also plan on putting i n a 3/4" subfloor.
Does Anyone have any ideas or suggestions ?
Thanks Rex