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Rafter Type

Supa Dexta

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Dec 16, 2018
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What do you call this type of rafter, where it's like a jack rafter but it doesn't connect directly to the hip, as it has a cross plank to fasten to instead?
 

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Supa Dexta

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For whatever reason, if it actually does have a name - it's very rare to come across. I did find this pic comparing, but no name either.
 

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K'ledgeBldr

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Johns Creek, GA
Not sure there is a “name”. But as it was explained to me a long time ago, when you have unequal length jack rafters (due to the different pitches) you end up with unequal lengths of the hip rafter between jacks. In order to “equalize” the pressure on the hip (so it basically stays straight) those short blocks are used. Think of it as an “outrigger” like used for barge rafters.
 

The Tool Tyrant

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Back in my previous life, I cut many conventional roofs. You can create cheek cuts greater than a 45° by either making the plumb cut first, then say you need a 60° cheek cut, you then subtract the needed angle from 90° (90 minus 60 = 30) set your saw table to 30° and make your cheek cut by placing the table against the 90° plumb cut. The line of cut is the 90° corner between the plumb cut and side of the rafter...or, buy this http://www.bigfootsaws.com/bigfootproduct/swing-tables/
 
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The Tool Tyrant

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I probably made it sound more difficult than it really is Bill. I would use that method if I only had a few cuts >45°, other wise it was my Bigfoot 10". After 32 years of framing, I still miss the smell of fresh Douglas Fir in the morning!
 

billconner

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Thousand Islands NYS
None of your diagrams show other than square corners, opposite jacks 90 degrees to each other in projected plan. Someone figured out a new way of framing.
 

Zeke

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Long Beach CA, the sewer by the sea.
Bringing this back for a moment I did a roof (actually 2) that did not have the hip at 45 º. True that rafter layout gets "jacked up" doing this. but the other thing is that if you don't extend the length of one side, the facia won't line up (if used). It makes for a nice looking roof line in some circumstances, but good luck in finding a carpenter that can understand this.
 
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Supa Dexta

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This is a farm structure. so doesn't need to be too fancy. But its a 3 sided lean-to thats used as a wind break, and just the way I happened to build it once I got going, So there's 2 of these hips in it.
 

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rharman

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Never seen that before. It's an interesting solution. Wonder if there is any engineering/load issue?
 

Renegade1LI

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long island ny
That's a gettr done with what we have rafter. I love looking at old farm buildings, lots of interesting construction techniques.
 
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