Rafter Tails

[Anonymous]

I'm curious how some of you would handle this rafter tail design (See attached).

I can make it look right in elevation by using the 'Two Cut - Plumb' Rafter Cut. but it wont look right in sections.

I'm resisting modeling all rafters as this is a monstrous project.

I can use a 'Two Cut - Square' Rafter Cut & add the fascia board but it wont look right in elevations with the bottom edge of roof line showing.

Any suggestions would be appreciated.

Thanks!

[Sahay_R]

Generate a swept void to cut the ends of the rafters. You will need to create a profile of the right shape to make the desired cut.

[barthbradley]

I'd do another roof for rafters (just the modeling the eaves; not the entire roof). A Two-Cut Square under the Plumb-Cut main roof. And then join them to remove the visible edge between them. 

[cbcarch]

You can use Reference Planes to trim the ends of the joists as well.

In a section view, place a Ref. Plane.

Then use Cut Geometry to trim the joist end.

[Anonymous]

This would get the look in section, how would you then get the elevations to look proper (see rafter tails and not continuous line of roof along bottom)?

I currently have elevations looking correct (jpg) by repeating detail and mask group at ends of roof. 

[barthbradley]

---

@Anonymous wrote:

This would get the look in section, how would you then get the elevations to look proper (see rafter tails and not continuous line of roof along bottom)?

I currently have elevations looking correct (jpg) by repeating detail and mask group at ends of roof. 

---

It was precisely because of your elevation, that suggested the approach I did. I don't see the rafter tails as structural elements. More as architectural features. 

...how's the roof actually being framed?  

[barthbradley]

@Anonymous: sorry; I get it now. 

You can do the same thing I suggested using a sloped glazing roof. This way you can articulate the individual tails in elevation view. 

[Anonymous]

I didn't know about that, I'll have to look into it. How does that compare to the Rafter Framing Modeling Extension, have you used that? It still doesn't have the specific rafter tail (Plumb & Square) configuration that I've been charged with figuring out. {Sigh}.

Thanks though, I do love learning new tricks!

[ToanDN]

Use a 2-cut square with a custom profile gutter.

[barthbradley]

...or use a beam system (w/ custom-cut rafters). Just for the eaves, or all the way to the ridge board as shown in the semi-transparent sheathing view.  

[Anonymous]

That is the look! How did you cut your rafters or did you just use roof fascia for that?

Thank you for your suggestion.

[barthbradley · Accepted solution]

---

@Anonymous wrote:

That is the look! How did you cut your rafters or did you just use roof fascia for that?

Thank you for your suggestion.

---

I modified the shape of the Dimension Lumber family that I used in the beam system. The fascia is also a custom-shaped profile. Another thing: the sheathing (and surfacing materials) will need to be a separate roof if you want to model this way. Personally, I’d model this roof in 3 parts: a roof with no overhang for the structural materials (rafters/trusses); a roof with overhang on top of that one for the sheathing and surfacing materials, and a beam system for the overhanging rafter tails – or not. You could just model one tail in-place and array it.  Something to keep in mind: there’s probably going to be a gutter that will cover those tails in elevation view. Just saying. All that detail work may not even be seen in Elevation Views of the finished model. 

Cheers

[ToanDN]

@Anonymous

I thought you said you didn't want to use structural framing for rafters because of such and such so I gave you a workaround with just roof and gutter.  So it's okay to use beam system now?

[barthbradley]

dang @ToanDN; are you missing your best friend?   

BTW, how did you get your fascia to cut the square-cut overhang the way you did? I couldn't. 

[ToanDN]

It ain't a fascia but a gutter.  Use Cut geometry to cut the roof end with it.

[barthbradley]

Yah; it doesn't work for me as either a gutter sweep or a fascia sweep. I can't cut the roof with it no matter. What's the secret? 

[ToanDN]

Well if you can't beat them, join them.  Know what I mean?

[barthbradley]

You're funny, @ToanDN! I got it!!! "JOIN". Yes! 

Thanks! You "da man" as always! 

p.s. you're also too darn smart for your britches. Betcha your mom tells you that all the time. 

[georgehobel]

@Anonymous  ...just a quick question...

when you create three different roof systems.. one for structure, one for sheathing, and one for tails.  what did you set your base elevation offset to for the sheathing to get it to sit right on top of the rafters?

[barthbradley]

---

@georgehobel wrote:

@Anonymous  ...just a quick question...

when you create three different roof systems.. one for structure, one for sheathing, and one for tails.  what did you set your base elevation offset to for the sheathing to get it to sit right on top of the rafters?

---

You can find that offset distance by using the Pythagorean equation: b/cos(A)

…but, I find it easier to just move the roof up in section view after I place it.