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Collar tie

Term Definition
Collar tie

a horizontal piece of timber connecting or bracing two opposite rafters to prevent sagging.

A collar tie is a horizontal roof rafter connector that is located in the uppermost third of the span of a pair of opposed sloped or "gable roof" rafters. By upper third, here we mean one third of the length of the rafter from ridge to top plate. A collar tie is used to prevent rafters from separating from the ridge, a structural failure that can be caused by snow loads, wind loads, or un-balanced roof loading for any other event or force that causes the roof to begin to move downwards or to collapse.


Collar tie Collar Tie

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