![]() ![]() Ceiling joists can serve as Rafter ties when they are running the same direction as the rafters and are properly tied tied together with them at the exterior wall. Spreading walls will create a sagging roof. Rafter Ties- Rafter ties are required to be installed in the lower third of the roof frame area to help prevent exterior wall cans from spreading. Photos below show properly installed collar ties at 2 other framing / predrywall inspections. Photos above show missing (required) collar ties at the construction of 2 different roof frames at JWK Inspections Framing / Pre Drywall inspections in the San Antonio area. Also, an engineered truss roof frame does not ordinarilly have a ridge. This is on a conventional stick frame (non-truss) structure, as engineered roof trusses do not require collar ties from a framing material as they are tied together with metal plates / gussets. ![]() Collar ties as per current IRC code are required to be at least 1x4(nominal) material but are most commonly 2x4's. ![]() Metal Brackets or Straps can be an acceptable alternative in lieu of the more common use of the wood framed collar ties. Collar ties prevent rafter separation and uplift. Collar Ties are connections between opposing rafters at the upper one third of the roof frame area just below the ridge and they are required at a 48" (4') maximum spacing which is every other rafter of a 24" on center spacing and every third rafter with 16" on center spacing. ![]()
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