How To Frame A Gambrel Roof Truss

A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof.

How to frame a gambrel roof truss.

The double bend in the trusses makes for a more spacious area that affords more usable square footage than the average roof truss. Gambrel roof trusses are a popular style used often in barn or garage construction. Because of the number of bends in these trusses each one is custom made to specifically fit the roof that it will be installed within. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth.

To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a. Use the protractor to measure those angles at the peak the walls and the point where the two lines intersect on the top side of the roof. Attach the components to the gambrel ends and secure them to the framing with 3 1 2 galvanized screws after drilling pilot holes. That truss count number less 1 times 6 count 1 6 total is the number of osb web pieces you ll need to cut.

Nail along the edges of the osb or plywood driving the nails into the rafters every 8 inches 20 cm with 8d common nails. The project architect briefly discusses the. A gambrel style shed roof offers the most storage space in the attic when compared to a gable or saltbox style shed roof. Start with the top corners of the roof first.

Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. As you can notice in the image you need to use regular trusses and to install 7 blockings as to get a 10 overhang. Nail osb or plywood onto the rafters to enclose the roof. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.

Calculate gambrel angles with graph paper and a protractor. Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush. Installing the roofing sheets. Framing a gambrel roof site built trusses are a speedy way to frame this traditional barn shaped roof.

By joe stanton issue 141. Take the same truss count number times 4 for the number of 2 4 truss pieces you ll need to cut. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. 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.

A rhode island builder shows how he built trusses for this classic roof shape right on the job site simplifying a procedure that can be slow and cumbersome.