Rafter tie connections shall be based on the equivalent rafter spacing in Table 2308.7.3.1. Test your knowledge with 2 full practice exams based on the Residential Plans Examiner Exam & 1 Plan Review Test. Rafter ties shall be spaced not more than 4 feet (1219 mm) on center. Want to become a Residential Plans Examiner? * Reference Source – 2018 International Residential Code – So this sums up the basic code requirements for collar ties.įor more information regarding detailed requirements, be sure to check out Section R802.4.6 of the 2018 International Residential Code (IRC). Rafter ties are a completely separate topic of discussion but as for now this outlines some of the differences between a collar tie from a rafter tie. Rafter ties are installed between opposing rafters, and they should be installed as close as possible to the top plate. They’re usually required every 4 feet, which means you only need a rafter tie for every other pair of 24-inch. The roof framing mock-up below shows a standard rafter tie. Rafter ties are an additional framing member that connects opposing rafters and runs above the ceiling joists. While collar ties are located in the upper one-third area of the attic, rafter ties are located in the lower one-third area of the attic space.Īlso while a collar ties needs to be no less than a nominal 1 inch x 4 inch member, a rafter tie must not be less than a 2 inch x 4 inch member. A rafter tie is a tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under a load. While collar ties are used to resist ridge uplift caused by wind loads, rafter ties resist rafter uplift (thrust) caused by wind pressure applied against the wall which moves up under the roof overhangs. A tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load. Even though they sound like they have similarities, they are very different. Many people confuse collar ties with rather ties. To see how ridge straps must be fastened, we must refer back to Table R602.3(1) above which basically is the same as collar ties. These straps must also be space no more than 4 feet on center and be a minimum 20 gauge with a 1-1/4 inch width. In lieu of collar ties, the code allows you to use metal collar ties also know as ridge straps. What if you did not want to install collar ties in the attic area? Is there another option? The H1 is designed for nominal 2x lumber. Simpson Strong-Tie hurricane ties are designed to resist high winds and seismic forces by positively connecting trusses/rafters to the top of wall of the structure. A collar tie is a horizontal structural member between the rafters, which is raised from the feet of the rafters to almost the middle of it. By now you know that a collar ties is a wood member with a nominal size no less than 1 inch x 4 inch, spaced no more than 4 feet on center, and located within the upper one-third area of the attic space. Simpson Strong-Tie 5-2/7-in 18-Gauge Zmax Steel Rafter Tie Wood To Wood.
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