Gambrel Barn Roof Angles

Gambrel roof framing geometry calculator metric this gambrel roof confines to a semicircle and starts as the top half of an equal sided octagon.

Gambrel barn roof angles.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. The easiest way to get these angle measurements on the ends will be with the use of a speed square. Gambrel roofs are symmetrical with two slopes on each side of the roof. A gambrel has four angles at the peak at the wall and where the two rafters or truss chords connect.

Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. You want to try and use angles that are as close to 45 as you can get for both ease of construction and good strength. Gambrel 2x4 truss measurements defined now we know all the necessary measurements to cut and make our first truss. Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area.

Since the sum of the three angles in a gambrel roof is 180 degrees the angles you will need are as follows. Four angles needed with the gambrel roof design there are four angles that are used to make up a total of 180 degrees. In other words if you start with a say 14 12 bottom pitch your top pitch should be 7 12 or greater. 45 degrees where the joists meet up with the top plate or header and 90 where the joists meet in the middle at the ridge board.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. 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. A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. A gambrel style is often called a barn roof.

Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a. You will need to make 22 5 degree angle cuts on the rafter joist ends that mate up to the top plate or header. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon.

If at all possible it looks the best at exactly half. A gambrel roof is a popular roof style on many contemporary barns and sheds. Its double or sometimes triple slopes on each side of a peak provide more space inside the roof which is attractive to homeowners too. If you plan on building and installing your own gambrel roof you ll have to draw out plans first to determine the proper dimensions.