Gambrel Roof 32 Foot Span Structural Design

32 gambrel attic truss with a 22 12 lower pitch and 7 12 upper pitch with 12 overhang.

Gambrel roof 32 foot span structural design.

Figure 4 givesthe dimensions for the roofs. Usinga combinationof14 10 and 8 foot raftersections and the standard gambrel using a combination of14and 12 foot raf tersections. 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 framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.

Use these two tables for. Due to the overall height the truss is manufactured as a piggyback truss to allow for transportation. With no interior walls or support posts our engineered gambrel truss design optimizes useable upstairs interior space. If you re thinking about replacing your roof with a new one you will need a roof truss calculator.

Bothwere roof shapes stable underallcustomary dead loads for34 foot bams. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. This online truss calculator will determine the all in cost of your truss based on key inputs related to the pitch width and overhang of your roof. This piece of plywood represents the dimensions for your roof and will serve as an assembly site for your rafters.

Well let s face it it s a very attractive roof design but there are practical considerations as well. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.

This series of diagrams shows just how the second floor lays out in each of our six different truss widths. Due to the 13 6 height restriction and the larger span this trusses lower pitch had to be changed from 24 12 to 22 12 to make the pitch break work. A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. Lay down the piece of plywood in an area with ample space.

Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area.