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PostPosted: February 12, 2019, 8:19 pm 
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Location: Halifax, Nova Scotia
I built trusses once and decided that I would buy them thereafter. Talk about a picky job to build them, even with a template on my workshop floor. I got a surprise at plan approval for my building permit. The inspector couldn't approve trusses unless they were manufactured or my drawings were stamped by a PE. I'm a PE, but spent most of my career in government. Approving my truss drawings was the only time in my career I used my PE stamp in anger. :-)

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PostPosted: February 13, 2019, 8:57 am 
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Joined: October 19, 2012, 9:25 pm
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Location: Summerville, SC
Warren, can you verify my garage door header plan? I'm building the same thing that was in my SC garage.
Doubled 2x12 with 1/2 inch OSB spacer glued and nailed. 5 16D nails every 16 inches
Then nailing a 2x4 on the bottom of the assembly with 2 nails every 16 inches.

I've called Code Compliance and no one seems certain. They said nearly everyone is using LVL headers to save time.

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PostPosted: February 13, 2019, 10:25 am 
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Joined: January 31, 2012, 12:49 pm
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Location: Louisville KY
Steel I-beams. Yeah, let the hurricanes blow THAT down! (male grunting noises).

At least that's my plan for when I hit the lotto...

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PostPosted: February 13, 2019, 10:45 am 
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Trusses arrived 20 minutes ago. Came with PE stamped framing plan, design loading details, BCBI-B1 installation and bracing details, a TWO, yes TWO carpenter pencils.

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OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: February 13, 2019, 12:24 pm 
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TooBusy wrote:
TWO carpenter pencils.
What? No Sharpies? Or maybe the truss company put Sharpies in there, but they escaped, leaving the pencils behind. Sounds like something a bunch of rat-b@stard Sharpies would do... :mrgreen:

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PostPosted: February 13, 2019, 12:34 pm 
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tommy, I can't say for certain. I am not a structural engineer. However I did some searching. I think your 2x12's with OSB is not a good choice. I've read some reports of built up 2x12 beams of a similar span used on a gable end like yours and they have sagged in short time.

Here is one reference I found for span vs supported roof. It looks like glulam is the recommended way. Size depends on your building code's required snow load.

http://www.southernpine.com/app/uploads/SS_1-6L.pdf

edited!

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PostPosted: February 13, 2019, 2:39 pm 
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Chuck, that's the same thing I've been seeing. It makes me question these plans from the lumber yard. I wonder in their plans are they using a gable end truss or a Queen truss because it doesn't specify. Queens transfer the loads to the outer walls, but Gables want full bottom chord support.
Of course these plans aren't stamped by a NC licensed PE.

It looks to me like I should order a LVL for the big span and use the 2x12's if I decide to put a single garage door on the West wall.

:(

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OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: February 13, 2019, 2:41 pm 
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GonzoRacer wrote:
TooBusy wrote:
TWO carpenter pencils.
What? No Sharpies? Or maybe the truss company put Sharpies in there, but they escaped, leaving the pencils behind. Sounds like something a bunch of rat-b@stard Sharpies would do... :mrgreen:


Good thing Baby Girl works for Newell Rubbermaid. I have a lifetime supply of Sharpies. Unless the little bastiges keep escaping.

Currently have 4 Sharpies on my desk even the fancy Pro model with a lanyard loop.

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OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: February 15, 2019, 10:58 am 
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Weather forecast says El Nino is about to kick my a$$. Today is clear, then rain every day in the 10 day forecast.

:BH:

I have a conference call then I'm going on a stud cutting spree.

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OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: February 16, 2019, 3:10 pm 
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I would use a plywood box beam or steel for that header. And what are you going to hang your chain hoist track from?


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PostPosted: February 16, 2019, 8:36 pm 
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Too Busy: I am still a PE, but not with a license to practice anymore. But with that qualifier I would do what a plan approver would do here. According to 'Canadian Wood Frame House Construction' the maximum span for Spruce-Pine-Fir Lintels, No 1 or 2 Grade, with structural sheathing, 2 ply 2x12 , is 9ft 10 ins at 20.9psf snow load (the Canuck minimum). Your double door looks bigger than that ....

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PostPosted: February 16, 2019, 9:10 pm 
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What would the specs be on a steel ibeam that would span, say, 20 feet?

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PostPosted: February 16, 2019, 9:29 pm 
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Hey Warren,

I’ve seen a third 2 x 12 laminated onto the inside of a garage door header for a double size door suported by 2 x 6 door frame that is either set into a 2 x 4 wall (with the extra dimension either sticking out like a brick mold or sticking inside) or into a 2 x 6 end wall. Does that meet the support requirement for a normal 16’ double garage door?

Bill

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PostPosted: February 17, 2019, 11:06 am 
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BHR,

Too Busy is lucky. The next table in Canadian Wood-Frame House Construction is "Maximum Spans for Built-up Lintels - Roof and Ceiling Load Only - No. 1 or 2 Grade". It provides maximum spans for 3, 4 and 5 ply 2 by beams.

Again for 20.9 psf snow load:

12ft 0in max span for a 3 ply 2 x 10

14 ft 0in max span for a 3 ply 2 x 12 (will carry 31.3psf snow load at 12ft 0in span)

So Too Busy could simply add another 2 x 12 in place of the OSB core. Hopefully the local inspector will have access to similar US-code tables using locally available species.

But sizing an I-beam would require a locally-licensed engineer, although he is likely just to calculate EI for a code-approved wood beam and find a steel I-beam section with equivalent or greater EI.

Edit: A plywood-faced box beam is going to require a stamped drawing. Two-by lumber is probably cheaper. :-)

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PostPosted: February 17, 2019, 12:29 pm 
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Tommy, is it too late to change the design to two 8ft doors? :mrgreen:

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