Roof Rafter Collar Ties

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 collar ties are necessary to prevent separation of the roof at the ridge due to wind uplift. 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. Collar ties may take up space in the attic of your home but they are there for a reason.

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Collar ties attach.

Roof rafter collar ties.

Some of these can support the roof and prevent ridge sagging and wall spreading. How to install collar ties to roof rafters. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. The collar ties are used to strengthen the roof rafters to prevent them from buckling or sagging under the weight of the roof.

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. 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 prescriptive provisions of the building code require rafter ties on each rafter pair and collar ties every 4.

Collar ties rafter ties tension beams structural ridge beams. The rafter ties are incorrectly labelled as collar ties.

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