Gambrel roof square footage calculator calculate the square footage of a gambrel style roof using imperial measurements.
Figuring the height of a gambrel roof.
The lower slope length is measured from outside wall to the start of the upper sloped roof section.
Building a bathhouse with a hip roof.
Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.
We included a roof pitch chart below the 7 12 example image and the calculator below that.
Height a good rule to follow with a gambrel roof design is that it should be twice as wide as it is high.
The calculator made my life easier.
Gambrel roof framing geometry calculator metric this gambrel roof confines to a semicircle and starts as the top half of an equal sided octagon.
Carpenters measure roof pitch as inches of rise per 12 inches of run.
The rule of thumb that i use when designing a gambrel is that the top pitch should be no less than half the pitch of the bottom.
This will give not only asymmetrical appearance but also balance out the load of the building over a much more stable area.
If your goal is to only calculate the roof height do not enter any numbers in wall height field and only use building width and roof pitch fields.
Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.
As a reminder please don t forget to add height of rafter thickness of roofing material and ridge vent to the number that you ll get using our calculator.
Bath with a gambrel roof.
The pitch of a roof determines the height of the ridge board that runs the length of the house.
Calculate hip roof online.
Rafters are nailed to the ridge board and run down to overhang the exterior wall.
The lower slope is locked for regular gambrels.
If this isn t practical then perform the same measurement on the underside of the roof.
Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth.
In other words if you start with a say 14 12 bottom pitch your top pitch should be 7 12 or greater.
If at all possible it looks the best at exactly half.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Everything was simple just calculate get all the drawings then frame a roof.
Building width enter the width of the building.
Lower height the lower height is the distance from the floor to the peak of the lower 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.
Enter the slope of the lower gambrel rafter or select from the dropdown list.
