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While “helping” a buddy this weekend, I noticed that on 2nd story knee walls, they had angle-cut all the studs on their knee walls and then put two top plates on it. The angle matched the roof pitch. I was told that they could then cut their rafters to the proper angle, nail them to the ridge, then nail the rafters to the knee walls from underneath and use Simpson connectors to attach them. I’ve always used birds’ mouths and a flat top plate. Does this seem legal to you guys? It looked like an easier way to go, but I had to ask myself, if this is easier and just as strong, why is this the first time I’ve seen this? Any comments appreciated.
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Jason, I guess it's like a half dozen of one and six of the other.
My crews do the knee wall with the top plate level, use wedges inside, instead of cutting the rafters, and finish it off with the simpson connectors.