Gambrel Roof Collar Ties

I can now analyze the whole roof system as a simple three hinged arch.

Gambrel roof collar ties.

A gambrel style shed roof offers the most storage space in the attic when compared to a gable or saltbox style shed roof. The owner plans on using an engineered ridge beam and tells me that such a beam will eliminate the need for collar ties. 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 tie is a colloquial term for collar beam.

Collar ties collar ties are an alternative to rafter ties in framing where a conventional ceiling is not desirable. The 2015 international residential code does not require collar ties or collar beams. A friend has decided to put a gambrel roof on a 20 40 barn and has asked me to help in the framing. However in those situations when they are specified collar ties or ridge straps are usually installed in the upper third of the roof between opposing rafters.

Compared with the traditional gambrel frame this method removes almost all of the complex analysis. The collar ties are used to strengthen the roof rafters to prevent them from buckling or sagging under the weight of the roof. There are some exceptions however when collar ties might be useful even in a conventional attic roof. 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.

Like rafter ties collar ties are horizontal members that tie the rafters. I ve never framed a roof before but when i asked for details i didn t see collar ties in his drawing. Using the gussets eliminates the need for the collar tie. In this case the collars.

The guidelines i am about to explain for you outline the steps i use when i am designing my gambrel shed plans barn shed plans and small barn plans.