Framing A Gazebo Roof

dproc

Going to build a gazebo from scratch and was wondering if anyone knows the formula for cutting the hip rafter in relation to the common. It's going to be an 8/12 pitch. Trying to save time from a lot cut and re-cut to fit.

Joe Carola

Hold your framing square on 8/13 for the hip plumbcut if it's an 8 sided Octagon. What formula are you looking for and what are you using to figure out your rafters? Are you using a Construction Master Calculator, Scientific Calculator, or Framing square? This way I'll know what forumula to give you with what you're comfortable with.




If it's an Octagon, give me the side lengths.

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Joe Carola

Teetorbilt

For an 8/12 your angle is 33.75*. For compound angles, I'll need to know how many sides. IMHO, you're in over your head, you should have known basic carpentry before launching your project.

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Joe Carola

What's the 33.75° for?

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Joe Carola

dproc

8 sided, using framming square, I know the run and rise is different for the longer hip rafter. 12' x 12' octagon. 4' ea side so only one common in the middle.

Who are you refering too being in over their the head by the way?

KentWhitten

Rise is the same, run is different. Your height from top plate to the point in the middle in height is the same all the way around. Your "formula" is a²+b²=c². rise/run is your pitch on your framing square.

Teetor is talking to you. You do sound a little over your head, but we all were at one time in our lives. It's nothing personal. If you can't see the math, you can't see the math. How are you going to figure the lengths, pitches, angles, etc. without knowing simple geometry? (well of course except for asking here)

You have a decent collar tie or two figured in for this? you really need at least one good solid, well connected collar tie of some type holding it from spreading somehow.

What I have done a few times is use the commons first, almost like the 8 sided is not there. Two opposing commons, then the two perpendicular into the side of these. You don't need to bevel the plumb cuts for these. Then, the next 4 commons all have 45 bevels on them. Then it's just a matter of cutting in your hips. You can throw in a block between the commons and just plumb cut the hips rather than doing all sorts of fancy bevel cutting.

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Joe Carola

Is it 12' for the common span, or is it 12' for the hip span?

If it's 12' for the common span and it's an 8 sided Octagon, the sides will be 4'11-5/8".

If it's 12' for the hip span, then the sides will be 4'7-1/8".

Either way, you can't have 4' for the sides.

If your sides are 4' then the common span is 9' 7-7/8" and the hip run is 10' 5-7/16".

What drawing is the correct one?

Attached Thumbnails

     

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Joe Carola

Joe Carola

Don't listen to that stuff because it's not true and makes no sense. I've been framing for over 20 years and there's still roofs that I haven't framed yet. Does it mean that when I come to a roof I haven't framed that I'm in over my head, no...it just means that it's a roof that I haven't framed yet and will learn how to frame it.

Hope you come back and continue to discuss this.

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Joe Carola

Tonkadad

Well said.

woodman42

I have to agree as well. I built my first 12 X 12 gazebo and I am not a framer. Once I got the first rafter cut the rest was easy.

dproc

Trust me I'm not listening I was just a little shocked and qurious who they were talking to. This is not my first rodeo.

4' ft side was a relative number. Wasn't looking for the exact hip rafter length. I just wanted the to know if anyone knew off the top what the run would be.

Thx for the comments I'll figure it out myself.