Gambrel Roof Slope

Determine a pitch for the top slope of the gambrel roof the rise in inches per foot from the midpoint connection to the peak.

Gambrel roof slope. The picture above shows a top roof pitch of 4 12 and a side pitch or 23 12. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. In a gambrel roof usually the lower slope is steep whereas the upper slope is placed at a relatively shallow angle. The usual architectural term in eighteenth century england and north america was dutch roof the upper slope is positioned at a shallow angle while the lower slope is steep.

Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. Gambrel shed roof pitch and corresponding degrees. 7 12 or a rise of 7 inches per foot is a common top gambrel pitch. A gambrel roof can be defined as the type of roof that essentially consists of two slopes on each side i e.

For our example the gambrel roof has two pitches the top and the side. Make that pitch 12 7 a drop of 7 inches per foot from the connection to the wall. Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. Two different roof pitches with a gambrel shed truss.

Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. 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. We do not have to worry about water penetrating the roof shingles with this example.