Forums >> Revit Building >> Technical Support >> How to create Sloped Rafters with Various Rafter Tail Cuts

hank

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Joined: Mon, Oct 3, 2005
31 Posts

I had a heck of a time figuring out how to generate exposed raters recently so I thought I'd post this How To for anyone else in a similar quandry.  The families I developed are attached as well.  Let me know if somebody needs pre 2011 versions.  As for why there are two images attached... anybody know how to delete and uploaded image?  Anyway, you want the second one.

Also, I'm not sure this is the best way but just one that worked for me.  Please don't tell me I'm stupid or need to get Revit Structure or something.

This Tutorial is for you if uou have exposed rafters or just want to model sloped rafters that, unlike the dimensional lumber family, can show proper sloped cuts at the ridge and rafter tails.

Attached Images

Attached Files 84538_Sloped_Rafter_-_Square_Cut.rfa 84538_Sloped_Rafter_-_Tapered_Cut.rfa 84538_Sloped_Rafter_-_Plumb_Cut.rfa

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NMODIE

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Joined: Tue, Oct 27, 2009
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Hey thank you so much for making these families. One question. On the tapered rafter, how do you determine the length of the taper cut based on the slope so that the heel of the rafter is level? I've been trying to adjust the family so that the taper end is determined by a formula rather than a number that the user inputs by using the slope and the taper start (fascia depth). I've attached a little diagram of my struggles in math. I'm interested to hear what you have to say or if you have an easier solution. 

Thanks,

Noah

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hank

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Joined: Mon, Oct 3, 2005
31 Posts

Hey Noah,

All you have to do is set the "Rise" value (see image). It takes that relative to 12 (ie. 3:12 slope or similar) - the slope is then calculated using atan (inverse tangent - don't ask me how I figured this out).  Shouldn't have to do anything else.

Let me know if that's what you were looking for.

Hank.

Edited on: Mon, Jul 9, 2012 at 1:38:55 PM

Edited on: Mon, Jul 9, 2012 at 1:39:11 PM

Edited on: Mon, Jul 9, 2012 at 1:39:32 PM

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rachelg

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Joined: Thu, Feb 4, 2010
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Hello there, I would very much appreciate a 2010 version of your sloped rafter famillies. Thank you!

-Rachel

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