What Are Roof Rafter Collar Ties – House Framing Parts
http://www.homebuildingandrepairs.com/framing/index.html Click on this link for more informative videos about home framing. This video will provide you with a simple and basic idea of what a roof framing collar tie is. They are used to prevent the roof framing rafters from separating and are usually spaced 48 inches on center with about 4-16 d nails used to connect each end of the collar ties to the rafters.