Traditional Gambrel Roof Angles

Slope transition on gambrel roof.

Traditional gambrel roof angles.

For high wind areas or strong storms a pitch of 4 12 6 12 18 5 26 5 angle is recommended. Mmitrano posted in construction techniques on december 19 2002 08 56am hi all. Gambrel roofs are symmetrical with two slopes on each side of the roof. 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. A gambrel has four angles at the peak at the wall and where the two rafters or truss chords connect. 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. A gambrel roof is a popular roof style on many contemporary barns and sheds.

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. You have to have some kind of transition you can t just wrap the angle with shingles. They are excellent for both high wind and snowy areas. A gable roof has only two rafter or truss chord angles a top cut at the peak and a bottom cut at the walls.

Hip roofs can offer extra living space with an addition of a dormer or a crow s nest. So you have a really steep bottom pitch and a really flat top pitch. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. A gambrel or gambrel roof is a usually symmetrical two sided roof with two slopes on each side.

Gambrel roof a gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. The slant of the roof allows snow to easily slide off with no standing water. This results in that squatty appearance. Gambrel roof framing geometry calculator metric this gambrel roof confines to a semicircle and starts as the top half of an equal sided octagon.

If you don t want trim at the top of the steep part i d recommend you nail on a half shingle at the top with just the tabs and maybe a. Now i am going to give you a design secret that i have discovered free of charge. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. You will need to make 22 5 degree angle cuts on the rafter joist ends that mate up to the top plate or header.

Since the sum of the three angles in a gambrel roof is 180 degrees the angles you will need are as follows. If you plan on building and installing your own gambrel roof you ll have to draw out plans first to determine the proper dimensions. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. The purlin method calculates cuts that bisect the angles at the roof joints.