Moved into a house recently that I knew had some termite damage, so it wasn't a surprise. However, what was a surprise was how much. I punched out plaster and uncovered some heavily damaged 2x4's on a load bearing wall. It used to be an external wall, but an addition to the house has made it more of a center/interior wall. Now to the damage: 5 out of 6 2x4's are chewed up - so much to the point to where if I put drywall up I'm afraid standard screws won't catch. I've come to the conclusion that they either need replacing, or reinforcement, but I'm not sure which is the smarter course of action. Should I replace the 2x4's one by one? Or just sister the 2x4's with a second one right next to it? Thanks in advance!