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Old 06-12-2015, 05:15 PM   #1
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Supporting hip roof for Gazebo


Good day! First post. DIYer that tries things he shouldn't. I'll attempt to describe my project below - but honestly do not know much construction-speak. It's complicated trying to explain this.

I am building a 12' x 20' gazebo and have settled on an uncommon design for the roof that I pray is going to work. It made sense when drawing it up.

I have 2 8x8s already set 5' from the ends and centered as far as width. The rest of the deck is supported by 4x4s on bases on concrete. 2x10s are bolted on either side of the 8x8s running the length. Joists are 16" oc. Only thing left for the deck is screw down the boards.

The plan is to have the entire roof supported by the 8x8s (there are no other posts above deck line). Here's a terrible drawing
Supporting hip roof for Gazebo-imageuploadedbytapatalk1434143669.474538.jpg

(Peaks should all be over 8x8s here, not offset)
Supporting hip roof for Gazebo-imageuploadedbytapatalk1434143696.921528.jpg
- 2x10 ridge beam seated down in notch across top of 8x8s (10' across)
- 12' 2x10s on either side of 8s running the width. 4-bolt pattern through steal plates to avoid teetering.
- 45 angle 4x6s running up from 8x8s through the 2x10s (bolted to them) for lateral support.
- 20' 4x6s fastened ontop of the four 2x10s supporting length of roof.
- 12' 4x6s on either end (bolted to ends of 20') supporting roof.
- Lastly I'm considering adding additional 45 angled supports coming off the 8x8s downward to add another triangle for lateral support. Haven't settled on size yet. (See pic showing end)
Supporting hip roof for Gazebo-imageuploadedbytapatalk1434143716.747250.jpg

I'm getting some grief from the lumber provider about the 8x8s supporting all of this weight. I figured as a last resort I could swap out the deck's short 4x4 corners with ones that extend to the roof corners.

Thoughts?




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Old 06-12-2015, 07:41 PM   #2
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I think I would at least use 6x6's rather than 4x4 ,
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Old 06-12-2015, 09:45 PM   #3
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Supporting hip roof for Gazebo


Quote:
Originally Posted by scottktmrider View Post
I think I would at least use 6x6's rather than 4x4 ,

Do you mean if I choose to extend corners deck support posts all the way to the roof corners? I've thought about this, but if I believe the initial plan is "good enough" and I'm only adding support for the sake of peace of mind, it would seem 4x4s provide that. Now if I'm kidding myself and there's no way the original plan is safe then I'd agree 6x6s would be the way to go. Problem is I'd have to rip apart the ends of my deck. (As you can see the deck is actually wider than 12'. We just decided to use the full extent of the 16' 2x10s I got vs trimming them back. We only intend to cover the original perimeter with the roof.)
Supporting hip roof for Gazebo-imageuploadedbytapatalk1434159904.897775.jpg


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Old 06-13-2015, 11:39 AM   #4
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One good wind will flip that thing right over.
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Old 06-13-2015, 11:47 AM   #5
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that is way to much cantilever past the posts. 4' either direction would probably be about the max for that design without some serious fabricated metal plates but even then the posts could turn and buckle just from the force of the roof.
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Old 06-13-2015, 02:04 PM   #6
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As hand drive said that's a lot of weigh to overhang, I just hate 4x4 they twist and curl so bad if there sticking up like that
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