![]() ![]() In an A-frame, the rafters connect with the floor assembly instead of the tops of the walls, so instead of the ceiling joists, the floor joists serve as the rafter ties. In a typical home, rafters are resting on tops of walls and the ceiling joists keep the walls from spreading. Rafter ties go in the lower 1/3 of he roof and are designed to prevent the walls from spreading. The “Rafter Ties” are whatever struts connect the bottoms of opposing rafter pairs together to keep the bottoms of the rafter pairs from spreading due to the weight of the roof.Ĭollar ties go in the upper 1/3 of the roof and are designed to prevent damage form wind uplift. Things sort of turn into a mess every time you start dealing with terms. Should I be calling all of them out as defects? Traditionally-framed cathedral ceilings use structural ridges or rafter ties on extended centers with more heavily reinforced framing to accommodate the increased lateral loads. There is a neighborhood here that has dozens of houses framed that way with no rafter ties and they are straight as an arrow and have been there for 50, 60 + years. The engineer even said that there are provisions in the code that allow for no rafter ties and no self supported ridge beam if you put a bird’s mouth at the bottom and collar ties in. Also, a traditionally framed cathedral ceiling would have the rafter ties raised, or the collar ties lowered to compensate. They used the example of an A-frame where you wouldn’t typically have rafter ties. But the engineer, code enforcer, and framer all said that it wasn’t. ![]()
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