Test your knowledge with 2 full practice exams based on the Residential Plans Examiner Exam & 1 Plan Review Test. Want to become a Residential Plans Examiner? * Reference Source – 2018 International Residential Code – 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. The collar tie is typically too light, and in the wrong location, to resist outward thrust on the walls generated by the rafters. 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). A collar tie is a horizontal structural element usually located approximately 2/3 of the way from the floor to the peak of the roof. ![]() 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. 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. 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. 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? 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.
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