![]() The reason knee walls would be problematic is that the roof rafters would be pushing out on them at the top. You can get by with 2圆 on 24" centers but you need to use 3/4 plywood as decking.Īnything less than 3/4 decking and I'd go 16" centers on your roof rafters.ġ/2" on 24" centers creates to much sag and bounce. If I were going with shear speed of build I would just build a single pitched roof on a 4:12 or what ever pitch you would like. Then move the horizontal line up by another 1/3 and the inside of your house would look just exactly like the inside of a of a house built with a gambrel roof would look. The bottom of the legs of the "A" are what would be touching the top plate on your knee wall. Were the horizontal line is your ceiling joist and the diagonals are your roof rafters. You can still put a few ceiling joists in and let them be exposed.Īnother possibility is to raise the height of the ceiling joists further up the roof rafters. If you are wanting to have the underside of your roof rafter as the ceiling. That would eliminate any force pushing outward on the wall from the rafters. It would be to much lateral force on the original wall. If it were to much lateral force on the knee wall. On a side note, although not technically required, we are striving to build according to International Building Codes.so that makes things extra fun Maybe bolts would be stronger? I'm having trouble finding photos or diagrams that show those connection points clearly, so it's difficult to evaluate options.Īny and all tips, questions, comments, links, photos are much appreciated!! I've been thinking we should cut a "joist seat", basically an L shaped cut-out that rests on the subfloor, and toe-nailing with screws (toe-screwing? haha). I am trying to visualize how to use bolts to connect rafters to the joists. Scott, thanks for the tips! Do you think 2圆 rafters would be secure with plywood or osb gussets, and no collar ties? What about 2x8? This article supports the use of gussets instead of collar ties, and that would be my preference! Otherwise I foresee years of banging head on collar ties. I would love any and all opinions on the insulation and rafter size! Maybe we should just take our chances with thinner R-23 insulation and use 2"圆" rafters, especially since we have a bunch that were intended for the knee walls. We are hoping to rely on good insulation and passive solar for heat. Possibly because we've been planning on 2"x 8" rafters to accommodate R-38 insulation "to code". He said that he recently concluded that the knee walls couldn't (reliably) withstand the lateral force of the gable roof (rafters would be attached to the knee wall top plates). We were planning on the knee walls for the last 8 months, and we're relying on my carpenter dad for designs and a lot of the labor. ![]() I am a complete novice at building, and currently I'm working overtime at my weekday job, and the rains have arrived in full force so I'm scrambling to research the best/fastest options. ![]()
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