Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577602
07/20/19 10:16 AM
07/20/19 10:16 AM
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tjm
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Well it would also matter a little if the board is on edge or laid flat. the exact usage is important if asking any question of this sort. as a collar tie or open joist the span could be greater. It's been few decades since I did the math, but for most purposes I think oak and syp are about equal in span and load capacity. This calculator actually lets you pick the wood and play with loading and deflection and tells you the spans and required end bearing. https://awc.org/codes-standards/calculators-software/spancalc
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577605
07/20/19 10:21 AM
07/20/19 10:21 AM
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Joined: Dec 2006
Posts: 2,213 central Missouri
Bigfoot
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On edge with plywood decking steel roof sheets unheated the most snow ive ever seen was two feet
Last edited by Bigfoot; 07/20/19 10:23 AM.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577717
07/20/19 01:39 PM
07/20/19 01:39 PM
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Joined: Aug 2011
Posts: 45,271 james bay frontierOnt.
Boco
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I'd double up the 2x12's on the sides,with some plywood sandwiched.And 3 6x6 uprights on footings for end support. You making a car port?16 feet seems too much for a carport without a center upright.
Last edited by Boco; 07/20/19 01:47 PM.
Forget that fear of gravity-get a little savagery in your life.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577740
07/20/19 02:14 PM
07/20/19 02:14 PM
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Joined: Dec 2006
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Bigfoot
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Ther are no local codes and the only inspector is a sewer inspector im just covering my deck there will be a upright supporting the ridge beam
Last edited by Bigfoot; 07/20/19 02:19 PM.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577768
07/20/19 03:02 PM
07/20/19 03:02 PM
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Joined: Aug 2010
Posts: 2,808 WI
handitrapper
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Ther are no local codes and the only inspector is a sewer inspector im just covering my deck there will be a upright supporting the ridge beam I wouldn’t know what it’s like not having zoning or building codes. lol The ridge carries only minimal weight. Nothing more than a nailer. Unless it’s a load bearing beam, like an LVL or Micro-Lams? Think of it like pre-fabbed trusses. No ridge beam. You’re collar ties (ceiling joists) keeps the exterior walls or headers from spreading. Thus keeping the ridge from sagging. Now as far as oak? They will be stronger than SPF. But maybe not so much as SYP or DF. Are the oak 2x6 kiln dried? Or green? If air dried? For How long? If you choose to use the oak? You’re not gonna be fond of nailing. Even if using an air nailer.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577777
07/20/19 03:14 PM
07/20/19 03:14 PM
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Wright Brothers
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If you nail a plumb upright from each joist to the peak, it'll fly as ceiling joists. BUT, Putting decking on now makes them floor joists and no 2x6s not enough. Someone some day WILL load that floor.
Go and talk to a building center in your area. Not a box store, a real building center. Even pay the man for his knowledge.
Now looking for tin hat.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577778
07/20/19 03:16 PM
07/20/19 03:16 PM
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Joined: Dec 2006
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Wright Brothers
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20' clear oak is big bucks. I assume you already own them.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6577802
07/20/19 03:50 PM
07/20/19 03:50 PM
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Joined: Dec 2006
Posts: 2,213 central Missouri
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Yes i did own the trees then had them custom sawed . Thats how i came by WO 2X12s and WO 2X6s 20' long
Last edited by Bigfoot; 07/20/19 03:52 PM.
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Re: White oak 2x6 freespan
[Re: Bigfoot]
#6579138
07/22/19 04:31 PM
07/22/19 04:31 PM
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Joined: Nov 2011
Posts: 9,132 SWMo.
tjm
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So, I'ma confused, are you using them as rafters? That's my take, but then; are you extending the gable roof as you have drawn with collar ties or are you talking of adding a shed roof off the eve (gutter line) ? Did you use the calculator I linked? If you are using them as rafters under a metal roof, why are you using plywood? Or is the 20' collar tie in the picture what you intend to use the 2x6 for? fwiw, I see no reason to add the 2x12 at the ridge, imo, that just adds load to the system unless it is supported from the ground. And then, the photo of the gable appears to be of a 3/12 pitch and your drawing of a 8/12? The pitch angle makes quite a difference in how the member loads and transfers the load. You really should have a tie much nearer the peak and one at the beam level. And if your intention is to use these as joists or loft, then all bets are off, go to 2x10.
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