Roof Collar Tie Placement

The rafter ties are incorrectly labelled as collar ties.

Roof collar tie placement.

In collar tie roof the horizontal tie is raised up from the feet of the rafters to the almost middle of the rafters. 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. The upper collar tie does not experience the tension that the lower rafter tie is resisting if that tension is resisted in the upper third the roof is probably on the ground. The 2015 international residential code does not require collar ties or collar beams.

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. More about building and repairing roofs. Installed in the top third of the roof structure collar ties prevent separation of the roof at the ridge due to wind uplift. Laying out a common rafter for simple gable or shed roofs you need to learn this basic building block of roof framing.

The prescriptive provisions of the building code require rafter ties on each rafter pair and collar ties every 4. Collar tie is a colloquial term for collar beam. Collar tie 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. Nail one end of the tie into the rafter with 3 inch nails.

This raised up horizontal tie is known as the collar tie. Roof classification of different types of roofs. Collar ties should not be fixed more than one third or one half of the rise of the roof up from the wall plate. Secure the opposite side in the same manner.

For example if the height of the ridge. Measure the vertical distance from the top of a ceiling joist to the ridge of the roof and divide the result by 3 to determine the height of the collar ties.