Hi there. I'm in the process of remodeling a section of my attic into a bedroom. Or rather I'm in the final stages of the planning. Everything should be all set, however the purlins (I believe that's what they're called; the horizontal members going from one rafter to another on the opposite side of a gable roof) are in the way. They are 6 ft up from the joists. I'd like to relocate them about another foot up for headroom, for a total of 7 ft (I'd also be replacing them with 2 x 6s, because currently they are 2 x 4s). I am aware that this may be a problem (roof sagging). However I am also placing knee walls (should be about 4 ft high) at 5 ft from the eave on both sides. Would this be enough to provide sufficient support for the roof, altogether? The span across is 25 ft. Also, I plan to sheetrock the entire area (knee wall to rafter to purlin, across the purlin, down the rafter to the knee wall). Would hanging the sheetrock from the purlins cause any issues? I'm aware of how what needs to be done (insulation-wise and whatnot) otherwise. Attached is a picture. Thanks.
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