Gambrel Roof Specs

With no interior walls or support posts our engineered gambrel trussdesign optimizes useable upstairs interior space.

Gambrel roof specs. Note that the gambrel style roof allows for a larger attic space with a 9 ft. To learn more about what we do please view our specifications and our faq pages. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. 20 x 24 gambrel garage.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. 28 gambrel attic truss with a 24 12 lower pitch and 7 12 upper pitch with 12 overhang. Anything less than this will ultimately result in a roof that leaks if you plan on putting shingles on it. 2x6 kick plate anchor to concrete with expansion type anchor bolts 2x12 treads nosing 1 1 8 minimum 3 2x12 stringers required 2x12 blocking wafer board risers and 2x6 ledger.

So you have a really steep bottom pitch and a really flat top pitch. This design provides the advantages of a sloped roof while maximizing headroom inside the building s upper level and shortening what would otherwise be a tall roof. Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. This truss will be used in planset.

Things you ll need ruler tape measure speed square chalk line saw 24 2 by 4 inches 5 1 cm 10 2 cm boards 6d nails 3 16d nails 8d common nails 5 inches 1 3 cm thick osb or plywood. A gambrel or gambrel roof is a usually symmetrical two sided roof with two slopes on each side. The barn roof style pictures shown with customer completed railing exterior steps and staining. The name comes from the medieval latin word gamba meaning horse s hock or leg.

Ceiling and 17 ft. Stair detail scale 1 4 1 1. A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a gambrel roof.

Most of your pre made trusses that are designed as a gambrel consist of roughly a 20 12 bottom pitch and a 4 12 top pitch. When you are designing your shed roof whether it be a gambrel gable or saltbox you should never have any roof pitch less than a 3 12. The upper slope is positioned at a shallow angle while the lower slope is steep. A gambrel roof well let s face it it s a very attractive roof design but there are practical considerations as well.

Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. With overhang selected drag slider to increment decrement birdsmouth seat width to suit. There really isn t a standard however i know exactly what you mean about the squatty appearance of your modern gambrel trusses. The term gambrel is of american origin the older european name being a curb.

Due to the overall height the truss is manufactured as a piggyback truss to allow for transportation.