Gambrel Roof Collar Ties

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.

Gambrel roof collar ties.

Collar ties collar ties are horizontal framing members that are essentially ceiling joists that have been moved upward to span the distance between the rafters higher than the top of the walls. 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. I can now analyze the whole roof system as a simple three hinged arch. In these cases structural collar ties should be securely fastened to the roof rafters with through bolts and spike grids.

They still tie the rafters together but they no longer form the low flat barrier that ceiling joists do. The tie will go from one side of a roof rafter to an adjacent rafter but on the opposite side. Like rafter ties collar ties are horizontal members that tie the rafters together and resist the force that tries to make the bottoms of the rafters spread horizontally and push the walls outward. Secure the opposite side in the same manner.

The 2015 international residential code does not require collar ties or collar beams. Collar tie is a colloquial term for collar beam. Nail one end of the tie into the rafter with 3 inch nails. 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 side of the adjacent rafter.

Compared with the traditional gambrel frame this method removes almost all of the complex analysis. Step 4 continue installing collar ties. With the first collar tie in place you will follow the same procedure. Such collar ties are usually designed to resist outward thrust when there are no ceiling joists or structural ridge to serve the function.