floor bounce adding joists
My house built in the 30`s has very springy floors. The joists are 2x6 spanning 11` and are spaced 18"oc. I`m going to add joists between them making it 9"oc. Adding a cross beam is not going to work due to limited head room. My question is how to fasten the new joists to the sub floor from the basement. Are there some kind of steel connectors or something?
I don`t want to tear out all the floors to do it from above.