Gambrel pitch and height

by Josh
(St. Louis)


Hi, i'm building a gambrel roof barn that'll be 30'x50', but i'm having trouble figuring out the pitch and height i want. most of the new designs look too "squatty" compared to the old gambrels in my area. is there a resource for figuring this out? are there traditional dimensions or formulas to guide in laying these things out?

Hi Josh,

Well there are about as many different gambrel roof configurations out there as there are gambrel roofs. There really isn't a standard, however I know exactly what you mean about the squatty appearance of your modern gambrel trusses.

Most of your pre-made trusses that are designed as a gambrel consist of roughly a 20/12 bottom pitch and a 4/12 top pitch. So you have a really steep bottom pitch and a really flat top pitch. This results in that "squatty" appearance.

Now, I am going to give you a design secret that I have discovered free of charge. ;)

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. 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. The shallower the top pitch the more "squatty" it will look.

My go to pitch combo is usually 14/12 bottom and 7/12 top. A 12/12, 6/12 combo will work, and so will a 16/12, 8/12. On your 30' wide barn that 14/12, 7/12 combo should work well. Wider barns will start to need a shallower pitch if the goal is to limit the height of the barn. The opposite is true with a narrower barn you may need to start going steeper to give enough head room in the loft.

Comments for Gambrel pitch and height

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Mar 30, 2015
Pitch for gambrel roof barn NEW
by: Anonymous

I appreciate your comments about avoiding squatty looking gambrel barns. I want to build a 40 foot wide and 60 foot long gambrel barn. What pitches would you recommend for it? If on other hand I went with a gable roof , what pitch then?

Feb 15, 2017
how about gable roof pitch? NEW
by: Tara

I have often thought the same thing about many of the agricultural buildings I see with gable roofs as well - that the roof pitch looks way too flat. Do you have a range of roof pitch that you think looks best, or a minimum that you don't go below? This would be helpful when designing a barn or other small outbuilding. Thanks!

Apr 15, 2019
How wide can you go with a gambrel truss
by: Montena

I see you guys have a 40x60 gambrel plan I was wondering if I can go wider then that looking for 80x100 any thoughts

Jul 29, 2019
how to... NEW
by: ben

I built a 12×16 shed with a gambrel roof and am now trying to figure out how to lower the roof so I can haul it to different location. Any ideas on that?

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