Roof Rafter Collar Ties

A collar tie is a horizontal roof rafter compression connector that is located in the uppermost third of the span of a pair of opposed sloped or gable roof rafters.

Roof rafter collar ties.

Collar tie is a colloquial term for collar beam. A tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge because of wind or unbalanced roof loads. Rafter ties resist the forces caused by gravity loads that would otherwise cause the roof to pancake and push out the sidewalls. In this how it works article managing editor debra judge silber explains the role of collar and rafter ties in the framing of a roof.

A collar tie is a tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge beam during periods of unbalanced loads such as that caused by wind uplift or unbalanced roof loads from snow. By upper third here we mean one third of the length of the rafter from ridge to top plate. Collar ties provide additional structural support for wood framed roofs that bear the weight of clay or concrete roofing tiles. This is especially important if the home is in the northern climates where snow accumulates on roofs or if there are multiple layers of roofing materials.

Collar ties attach between every other pair of opposing rafters at.