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Thread: Gambrel Roof Geometry
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26th September 2013, 05:31 PM #1
Gambrel Roof Geometry
A few people have asked about a Gambrel Roof Calculator so I've had a go at a test one.
Not many Gambrel roofs (or roof builders) around here, so I'd appreciate comments and suggestions from anyone who knows about this type of roof, on how the test calculator is set up, what's needed etc.
Gambrel Roof Geometry Calculator
It only works out the geometry, with the Gambrel fitting a semicircle.
It starts off as a half octagon with equal upper and lower length rafters.
Visit with Chrome, latest Firefox or IE10 and there are slider controls to edit the sweep angles and animate the diagram.
You can add a ridge thickness, and (what I've called a) purlin thickness to adjust dimensions if needed. (Is purlin the correct term here?)
If you check the 'Overhang' box, it overhangs the rafters the width of the end 'plumb cut', and shows a slider control to edit the seat width, adjusting dimensions to suit.
You can just extend the length of the lower rafter for extra overhang?
Also, to directly measure any horizontal or vertical dimension at scale in the upper diagram, left click, release and drag your mouse.
Thanks for any suggestions.
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26th September 2013, 06:47 PM #2Banned
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mansard
Mansard is the term I'm used too.
Mansard roof - Wikipedia, the free encyclopedia
I've only built 1.
Usually the sides are longer than the top rafters to fit dormer windows in and give more 'living (floor) space' inside.
You do it for "live in space" in the roof.
Mine was Ok for about 17 years or so, until a mini tornado scored a direct hit one night and took the complete upper roof story off - and deposited it upside down in a million pieces, each about 6 inches long, in a paddock a kilometer or so away... (Not insured either).
Cladding the bloody thing was a nightmare - the steep sides have a tendency to want to kill roofers and roof plumbers if they fall off.
Not as big a fan as I once was - in theory they are great.
Maybe others have had a better experience.
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27th September 2013, 10:39 AM #3GOLD MEMBER
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Easiest way to do mansards is on the ground and crane them up. A second set of top plates forms the base frame and everything is built up off that, then up she goes
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