Gable Roof Truss Design

Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters.

Gable roof truss design.

Lay the first piece of siding on the truss assembly and allow 2 inches of overhang below the bottom of the simulated top plate. Sheet gable end trusses remove the screws holding the truss rafters to the floor flip it over and put it back in place aligned with the simulated to plate. The truss sides will be equal in length and width to fit equally on the shed walls. A gable truss sits on the end wall of a structure and has vertical studs every 2 feet or 16 inches.

Finally there is a barn type or gambrel shed roof. A gable truss isn t structural and needs a continuous bearing support underneath such as a beam or wall. Squaring building lines example use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Gable trusses are more expensive than common structural trusses because more lumber is required.

The gable shed has a roof like a house so the roof trusses will have a peak in the middle. If you re trying to reinforce a shed or gable roof use a simple king post truss design which has a single vertical joist running through the center of the triangular frame. This is similar to the gable shed because the trusses will be in two different cuts because of the two different angles. Wood roof trusses bring the bottom chord of the truss all the way to the outside of the wall include a small vertical cut butt cut and angles back against the top chord of the truss.

After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors. They re often placed at the front and back of each other with the front pitch usually steeper. For larger structures like floors roofs or decks try a fink truss design which has internal joists arranged in a w shape for extra support. A pitch truss with two sets of different sloping sides.

For a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.