Can I use a table saw to cut a 4x4 at an angle to replace the top plate in this knee wall to salvage the wall?
Background: I have an attic bedroom which lacked insulation. The rafters are only 2x4s so my sister convinced me we should install these 2x3 along the rafters to place the insulation between. Unfortunately, now I'm realizing that this make the rafters into thermal breaks and I'd much rather remove the 2x3s and layer foamboard directly over the 2x4 rafters to avoid this. Problem is, going back to the normal way to frame the kneewall would require all new lumber. I'd like to save the wood and work already done by just replacing the top plate. Is it possible to do that?