Where Do Collar Ties Go On A Gambrel Roof

The owner plans on using an engineered ridge beam and tells me that such a beam will eliminate the need for collar ties.

Where do collar ties go on a gambrel roof.

The tie will go from one side of a roof rafter to an adjacent rafter but on the opposite side. A friend has decided to put a gambrel roof on a 20x40 barn and has asked me to help in the framing. The 2015 international residential code does not require collar ties or collar beams. Collar ties rafter ties tension beams structural ridge beams.

This means that if you secure one end of the collar tie to the left side of a roof rafter you will nail it to the right. For example very long rafters in a relatively steeply pitched roof slopes above 6 12 for instance may benefit from a stabilizing effect if adequately connected collar ties are installed on every rafter pair. Take the collar tie up to the attic and lift it into position to check for the fit. Some of these can support the roof and prevent ridge sagging and wall spreading.

There are some exceptions however when collar ties might be useful even in a conventional attic roof. The prescriptive provisions of the building code require rafter ties on each rafter pair and collar ties every 4. I ve never framed a roof before but when i asked for details i didn t see collar ties in his drawing. 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 rafter ties are incorrectly labelled as collar ties.