![]() Most builders prefer to use 2×4 (nominal) lumber, giving a lot more stability and strength. The smallest collar tie can be 1×4 (nominal) lumber, which is not very thick. You need to plan for the roof’s weight and the added weight of snow if that’s a concern. The maximum size of a collar tie is not clearly defined, and the size of the collar tie overall needs to be determined by calculating the total amount of weight that the roof may have to carry. In the following few sections, I’ll take a more in-depth look at the three main code restrictions regarding collar ties. ![]() These are the three main characteristics of collar tie design that you should pay special attention to when planning: However, collar ties have three standard building practices that affect how you install the collar ties for your home. The 2018 International Residential Code does not require collar ties. Collar ties, contrary to popular belief, do not keep walls from spreading.Where necessary, they should be installed on every other rafter where rafter spacing is 24 inches apart. ![]()
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