what is proper truss/post support? pole barn

[WIHD]

Note the images, I was under the impression every truss needed to sit on top of a notched post like the first photo (to support roof weight, snow load etc), but I noticed some trusses/posts are not this way (2nd photo)

Can someone clarify this? I'm guessing there's engineering at work (headers tie into it?) that I am unaware of.

=>Talking a pole barn w/ metal roof, 4/12 slope, uninsulated on a slab, not a 'garage' attached to a home. Thanks.

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[Spook001]

In my barn, the trusses are set on a double 2x12, as in the 2nd pic. It’s called a truss carrier. But my posts do not extend over the top of the truss carrier. The truss carrier is thru bolted to the post, also. Not just nailed.

 

[Spook001]

I’ve never seen the posts in a pole barn notched. In a old beam barn yeah.

 

[kj_mustang]

Mine is built with the double 2 x 12's holding the trusses.

 

[WIHD]

In my barn, the trusses are set on a double 2x12, as in the 2nd pic. It’s called a truss carrier. But my posts do not extend over the top of the truss carrier. The truss carrier is thru bolted to the post, also. Not just nailed.

thanks, that's what I'm wondering. Some engineering involved there that's for sure.

 

[WIHD]

I’ve never seen the posts in a pole barn notched. In a old beam barn yeah.

https://www.hansenpolebuildings.com/2018/10/what-size-truss-carriers/

 

[Jeeper89]

Mine has a 2x12 on the inside of the wall and a 2x12 on top of another 2x12 on the outside, so kind of like a 2x24 I guess. Seemed like a crazy amount of overkill but it hasn't collapsed yet. (West Michigan snow load)

 

[Jeeper89]

Best picture I have


Sent from my iPhone using Tapatalk

 

[larry_g]

https://www.garagejournal.com/forum/attachment.php?attachmentid=80108&d=1286471525

You can see in the above picture what was spec'ed in my drawings. The support 2x6's on the side of the post have a specific nailing pattern and then bolted through. The inspector checked them on final. Still holding today.

lg
no neat sig line

 

[GMCGarage]

Note the images, I was under the impression every truss needed to sit on top of a notched post like the first photo (to support roof weight, snow load etc), but I noticed some trusses/posts are not this way (2nd photo)

Can someone clarify this? I'm guessing there's engineering at work (headers tie into it?) that I am unaware of.

=>Talking a pole barn w/ metal roof, 4/12 slope, uninsulated on a slab, not a 'garage' attached to a home. Thanks.

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Are these regular trusses, or Girder trusses? Whats the spacing of the trusses?

 

[gayler]

My trusses are spaced 10ft. My poles are 3 treated 2x6's nailed together to make a 6x6 post. with the center one short for the truss to set on and the truss is then bolted between the outer two 2x6's,

 

[rayra]

RR Buildings on YouTube shows a lot of post-frame construction. They seem to typically use triple-laminated 2x6 posts and have the trusses sandwiched by the outer boards of the post. Looks very strong. Takes full advantage of wood design strengths.
Seems totally stupid to rely on the sheer strength of chinesium fasteners when a notched post will last a lifetime.

 

[theoldwizard1]

OP - the first pic is far superior to the second.

In my barn, the trusses are set on a double 2x12, as in the 2nd pic. It’s called a truss carrier.

Good, but if the post was notched and mayve spaced 8' instead of 10', you would probably only need ONE 2x12 for the truss carrier and nails would have been adequate.

RR Buildings on YouTube shows a lot of post-frame construction. They seem to typically use triple-laminated 2x6 posts and have the trusses sandwiched by the outer boards of the post. Looks very strong. Takes full advantage of wood design strengths.

You really need to watch his building methods. He is VERY precise and does things different than most builders. Triple-laminated 2x6 posts with on cut shorted for the truss is a good way to go, but there is a problem with this and RR solves it.

First you need up-rated trusses because you have fewer of them and they are space farther apart. Second, purlins are imperative, but RR attaches the edge up, on top of the rafters. This is much stronger than flat nailing them to the trusses. This also require 6" long screws to attach them to the trusses.