How To Frame A Gambrel Roof Truss

Gambrel roof trusses are a popular style used often in barn or garage construction.

How to frame a gambrel roof truss.

Framing a gambrel roof site built trusses are a speedy way to frame this traditional barn shaped roof. 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. Start with the top corners of the roof first. 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.

Attach the components to the gambrel ends and secure them to the framing with 3 1 2 galvanized screws after drilling pilot holes. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. That truss count number less 1 times 6 count 1 6 total is the number of osb web pieces you ll need to cut. A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. By joe stanton issue 141.

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. Take the same truss count number times 4 for the number of 2 4 truss pieces you ll need to cut. Place the osb or plywood on the top portion of the rafters and make sure that the edges run flush. The project architect briefly discusses the.

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. Draw a semi circle on the graph paper mark a center peak at the top and draw two lines on each side in the shape desired for the gambrel roof. Calculate gambrel angles with graph paper and a protractor.

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. Nail along the edges of the osb or plywood driving the nails into the rafters every 8 inches 20 cm with 8d common nails. Take the number under the column of the center spacing 16 o c. Installing the roofing sheets.

The double bend in the trusses makes for a more spacious area that affords more usable square footage than the average roof truss.