I want to build a small (24×48) pole barn with a shed style roof. I got a quote from the lumber company for using TJIs as the rafters (I prefer these over trusses because I plan on using polycarbonate around the pitched area of the walls for natural light and wish to finish the ceiling off).
I looked all over the interweb and couldn’t find any detail pics of anyone connecting TJIs on a pole barn. My guess would be to to pitch the top girts on the load bearing sides of the building to match the roof pitch (2:12), fill the web ends of the TJIs with material to act as squash/end blocks and attach through the front and back side girts with a 2×6 or metal strap. Does this make sense?
Thanks!
Mat
Replies
No squash blocks needed if you are not adding point load above.
There are Simpson brackets made for attaching TJIs to a pitch. odds are good that any yard selling the TJIs can sell you the right hardware
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If you know the name of the manufacturer you'll likely be buying them from you can download a PDF from their website with installation details.
You can probably get some mone trusses for about the same amount of money, and they'd likely take less installation labor. Might be cheaper, too.
Mat,
This was from another thread and it will give you an example depending on what brand I-joist you use what to do. Click the link and scroll down.
http://forums.taunton.com/tp-breaktime/messages?msg=123436.15
Thanks all for the responses. I've dealt with TJIs using stick framing before, so my concern relates to using them in a pole building configuration. What I am most curious about is how to attach to the top girts. I have an old pole barn framing guide (ancient is more like it) where they show 2x6 blocking infill nailed between the two girts and extended up to the rafter. I would surmise I need both of these girts/rafter carriers to be connected to each rafter.
The reason for the 2:12 pitch is so the workshop doesn't dominate the house with roof height (for one) and I can set TJIs myself - so hard to find good help these days. I like to do my own stunts anyhow.
"where they show 2x6 blocking infill nailed between the two girts and extended up to the rafter. "I can't really get a picture of this in my mind, but relative to TJI's you need to follow their prescripions, not a detail from an ancient book probably written before TJIs were invented
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If I understand him correctly he's looking for confirmation on how to fill gaps between the ends of the TJIs.
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Edited 8/26/2009 7:05 am ET by john7g
Maybe.
But he used the term squash blocks wrong then.Here is the best picture I can imagine from his verbal - that he might build the support beam - what he calls girts - a double girder beam at top of the posts. What you call a purlin in your sketch would have another one on the opposite side of the post with space between them. ( hopefully he would notch into the post so the bearing surface of the girt has a resting ledge and is not simply crucified with a couple lags) His book shows short vertical 2x6's running between the girts and up next to each rafter.But he says his biggest Q is about how to attach the I joists to the girt beam.
Since I already answered that early in thread, I have to think he missed reading it, or that I misunderstand the Q and descriptions.
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did I put purlin on there? Girt it is as well as not squash blocks. Just fillers. Semantics can make a big difference.
Maybe we'll hear more from him again someday
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Why 2:12?