I Joist Bridging

 
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Old 07-13-2011, 08:24 PM   #1
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I Joist Bridging


Well I am wondering of you guys use the metal bridging when installing tji joists. I worked for a contractor where we did not, but i am not sure if he was trying to save money by not putting them in or if they were not necessary.
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Old 07-13-2011, 08:39 PM   #2
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Re: I Joist Bridging


I've used them some times and sometimes not

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Old 07-13-2011, 08:47 PM   #3
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Re: I Joist Bridging


The I joist installation guides don't require it if the bottom of the I joist has drywall installed. We will put furring strips 4' oc in our crawl spaces to act as lateral bracing. I suspect bridging would also be fine.
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Old 07-13-2011, 09:05 PM   #4
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Re: I Joist Bridging


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Originally Posted by overanalyze View Post
The I joist installation guides don't require it if the bottom of the I joist has drywall installed. We will put furring strips 4' oc in our crawl spaces to act as lateral bracing. I suspect bridging would also be fine.
so of it is on a floor on the first story where there is no drywall below, they are recommended?
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Old 07-13-2011, 09:07 PM   #5
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Re: I Joist Bridging


It is how I read the guides. The I joist need something to keep them vertical..they don't sag as much as they flex side ways...
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Old 07-13-2011, 09:15 PM   #6
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Re: I Joist Bridging


No... but we always strap the ceilings anyway.
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Old 07-13-2011, 10:43 PM   #7
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Re: I Joist Bridging


Never

Would like to see instructions for I joists that require.
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Old 07-13-2011, 11:18 PM   #8
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Re: I Joist Bridging


we don't really either.
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Old 07-14-2011, 07:45 AM   #9
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Re: I Joist Bridging


Hughjazz, In alberta at least here around the calgary area when you look at most floor system designs they take all the information into account. The floor system will be designed for a certain live/dead load. It will take into account wheather there is gypsum applied to the underside of the joists. Some joist designs even take into consideration large islands with granite on them or other such loads like offset bearing walls. In alberta either they dont or certain codes do not exist that force framers to put strapping or bridging underneath the floor system where as other juristictions require it possibly due to siesmic factors. The best example i've seen is two floors with exactly the same span and having different joist ratings. The reason the basement had a heavier joist was to accomodate the fact that there wasn't a drywalled ceiling to stiffen it up. Either way blocking or bridging = squeaks.
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Old 07-14-2011, 05:47 PM   #10
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Re: I Joist Bridging


Quote:
Originally Posted by Framer53 View Post
Never

Would like to see instructions for I joists that require.
Even though it is not a requirement, will it benefit the floor by putting it in? I guess i am just wondering why people put bridging in dimentional lumber but not I joists.
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Old 07-14-2011, 05:49 PM   #11
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Re: I Joist Bridging


The guides I have read have not required it..but they do recommend it. I will look it up at the office and try to post a link later.
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Old 07-14-2011, 05:53 PM   #12
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Re: I Joist Bridging


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Originally Posted by bluebird5 View Post
Even though it is not a requirement, will it benefit the floor by putting it in? I guess i am just wondering why people put bridging in dimentional lumber but not I joists.
The last I knew there was discussion about whether bridging actually works, so I guess most likely there is no need for it.

I am not an engineer and would like to hear one's thoughts on this...
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Old 07-14-2011, 06:51 PM   #13
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Re: I Joist Bridging


Metal strap bridging is a joke. On conventional lumber, you can make it tight enough to play a tune and within a month or two, there is so much play in it, it's virtually useless for its intended purpose, which is to distribute load to adjacent joists, or "load sharing". Lumber shrinkage is the culprit. The drive in type is much better, as it gets tighter as the joists shrink.

I personally prefer 1x3 or 1x4 pine for X-bridging. I staple it in with 3-4 medium crown staples on each end, to prevent splitting.

Here's a little thing I did awhile back using X-bridging. Check it out. I know it's not real world conditions, but it shows the theory behind distributing a concentrated load to the entire joist system.
http://www.contractortalk.com/f14/fu...ridging-68111/
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Old 07-14-2011, 06:53 PM   #14
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Re: I Joist Bridging


I only put the bridging under the parallel non load bearing walls!
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Old 07-14-2011, 07:12 PM   #15
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Re: I Joist Bridging


Here's a link I grabbed from the other thread.

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 07-14-2011, 07:20 PM   #16
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Re: I Joist Bridging


Quote:
Originally Posted by Warren View Post
I only put the bridging under the parallel non load bearing walls!
haha... are you a git er done framer?
?

Last edited by bluebird5; 07-15-2011 at 07:33 PM.
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Old 07-14-2011, 08:39 PM   #17
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Re: I Joist Bridging


Don't know how you get so many replies when you post a negative comment for your second post in the last couple threads you started...
But, it's an interesting topic.

Metal bridging? Last time I saw that was in condos built in 1980. Do lay-out to archies specs (I don't, not just a framer). No puns, don't get architectural drawings. If they're laid out to specs, adding blocking at key-load points ( then I don't believe it matters). Strapping the bottom with 1x's would help more.
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Old 07-20-2011, 02:32 PM   #18
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Re: I Joist Bridging


Bridging is not required for "I" joists unless the underside is left exposed in which case a 2by4 is fastened midspan and perpendicular to the underside of the joist.
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Old 07-20-2011, 02:42 PM   #19
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Re: I Joist Bridging


Quote:
Originally Posted by loneframer
Here's a link I grabbed from the other thread.

<a href="http://www.youtube.com/watch?v=R_OF9KgWhzI">YouTube Link</a>
The 3rd example is pretty cool but that would add some $$$ to the cost of the job
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Old 07-20-2011, 04:26 PM   #20
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Re: I Joist Bridging


Quote:
Originally Posted by Robert carozza View Post
Bridging is not required for "I" joists unless the underside is left exposed in which case a 2by4 is fastened midspan and perpendicular to the underside of the joist.
Want to give me a link to the specs that say that please?

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