I noticed that in the pic that is why I said something. You could place three 2 x 4's running horizontal between every stud. One toward the top one in the middle and one toward the floor. It will help support the T-111. If your studs are 2' on center then these braces should be about 22 1/2" long to fit inbetween the studs but measure twice and cut once. Another thing that will help is make sure you buy the 5/8" T-111. It is more rigid than 1/4 or 1/2". You said you are going to have 8' walls. Remimber that T-111 is only 8' long so you might have problems getting it to come down far enough to overlap the outside perimiter of the floor.