This may seem simple compared to working on a house but I don't want to do it and not have it work. I have a 20' W x 32' L one floor hunting cabin that I built. It's 20 years old and when I built it I skimped on materials where I probalby shouldn't have. At the time it was "good enough, nail it" Lets get it up and go hunting. The camp is on 15 piers. 3 rows of 5. The problem is that I framed the floor sils and joists with 2x6's. The sils are made of double 2x6s with a double 2x6 center beam. The joists are all 10' 2x6's 16" on center. I know everything shoud have been at least 2x8's and probably 2x10's. Now I want to take the movement out of the floor because it bounces and shakes if you stamp on the floor. There is a wood stove in the middle on one side and a heavy propane frig about in the middle over the center beam. Where the stove is the floor has sagged a bit but I can live with that. What I want to do is sister the joists,will this help. What size sister and best and easiest way to fasten. Not alot of room under camp but doable. Thanks in advance.