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Old 02-17-2012, 08:09 PM   #1
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floor joist attached to side of beam vs. on top


I have a 24' span, it has been engineered to use a 7" wide x 16" tall lvl. I have 9' ceiling but I hate to lose 16" of head room. I'm told my other option is to use joist hangers and attach the floor joists to the side of the support beam instead of resting on top, and this will only cost me a few inches of space. If the proper joist hangers were used, does anyone see a problem doing it this way?

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Old 02-17-2012, 08:15 PM   #2
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floor joist attached to side of beam vs. on top


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Originally Posted by vtboy51
I have a 24' span, it has been engineered to use a 7" wide x 16" tall lvl. I have 9' ceiling but I hate to lose 16" of head room. I'm told my other option is to use joist hangers and attach the floor joists to the side of the support beam instead of resting on top, and this will only cost me a few inches of space. If the proper joist hangers were used, does anyone see a problem doing it this way?
No...its done every day..

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Old 02-17-2012, 08:22 PM   #3
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floor joist attached to side of beam vs. on top


Joe, is there anything that would need to be done to tie the opposite ends of the joists together? Something like a lateral tie. Typically joists overlap on top of a bearing wall and the joists are nailed together.

Hopefully this question makes as much sense in writing as it does in my head.
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Old 02-17-2012, 08:29 PM   #4
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floor joist attached to side of beam vs. on top


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Originally Posted by vtboy51
I have a 24' span, it has been engineered to use a 7" wide x 16" tall lvl. I have 9' ceiling but I hate to lose 16" of head room. I'm told my other option is to use joist hangers and attach the floor joists to the side of the support beam instead of resting on top, and this will only cost me a few inches of space. If the proper joist hangers were used, does anyone see a problem doing it this way?
How come you can't use 24' i-joists with no beam? Are you matching an existing second floor...and have to use the same size floor joists?
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Old 02-17-2012, 08:30 PM   #5
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floor joist attached to side of beam vs. on top


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Originally Posted by Clutchcargo
Joe, is there anything that would need to be done to tie the opposite ends of the joists together? Something like a lateral tie. Typically joists overlap on top of a bearing wall and the joists are nailed together.

Hopefully this question makes as much sense in writing as it does in my head.
The joist get nailed to the top plates at the other end.
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Old 02-17-2012, 08:31 PM   #6
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floor joist attached to side of beam vs. on top


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How come you can't use 24' i-joists with no beam? Are you matching an existing second floor...and have to use the same size floor joists?
As of now they have speced 11 7/8" i-joist, house is 32' deep, so they will span 16'. was told if I spanned 32' it might have some bounce....
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Old 02-17-2012, 08:39 PM   #7
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floor joist attached to side of beam vs. on top


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As of now they have speced 11 7/8" i-joist, house is 32' deep, so they will span 16'. was told if I spanned 32' it might have some bounce....
Yyou would have more than some bounce. How about deeper Ijoists?
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Old 02-17-2012, 08:42 PM   #8
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floor joist attached to side of beam vs. on top


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Yyou would have more than some bounce. How about deeper Ijoists?
that is an option I would have to ask about, any educated guesses how deep I'd have to go to span 32' in the northeast (snow load), this would be supporting a second floor.
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Old 02-17-2012, 08:46 PM   #9
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floor joist attached to side of beam vs. on top


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that is an option I would have to ask about, any educated guesses how deep I'd have to go to span 32' in the northeast (snow load), this would be supporting a second floor.
If you are using trusses for the roof then all it supports is the second floor.

As far as the requirement of size. the manufacturer has pdf's available online if you look.

I would reference them for you but this computer is acting up...

If Joe is online he can find it for you or wait until tomorrow and call the lumber yard where you are buying them and ask.
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Old 02-17-2012, 08:48 PM   #10
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floor joist attached to side of beam vs. on top


rafters are stick built, it's a cape style with dormers(not sure if that makes a difference) I will talk to my lumber yard guy and see what he can span, if anyone has the spec feel free to send it to me.

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If you are using trusses for the roof then all it supports is the second floor.

As far as the requirement of size. the manufacturer has pdf's available online if you look.

I would reference them for you but this computer is acting up...

If Joe is online he can find it for you or wait until tomorrow and call the lumber yard where you are buying them and ask.
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Old 02-17-2012, 09:58 PM   #11
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floor joist attached to side of beam vs. on top


http://www.woodbywy.com/literature/TJ-4000.pdf

If I read the table right and depending on the load there is a 16" I-Joist that will span 31.5', I am guessing your walls are included in the 32' so are not part of the span.
If you can go the 24' way looks like a 11&7/8 will work.

This is for discussion purposes only.
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Old 02-17-2012, 10:15 PM   #12
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floor joist attached to side of beam vs. on top


is this new construction or a reno.. if its new construction its much easier.. just set the beam and install the hangers then hang the joists.. if its a renovation its much tougher as the existing floor system will have to be temporary supported then a channel cut out of the the joists for the beam to drop down into.. then hang the joists off the beam..

ive done for both renos and new construction several times.. the reno method sucks.. very nerve racking
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Old 02-17-2012, 10:29 PM   #13
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floor joist attached to side of beam vs. on top


To the OP....that is pretty much how my garage is built....7x16 PSL 20' long....garage is 20x25....so the PSL beam is in the middle...my floor joists go from the PSL beam to each end sitting on top of the top plate....





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Old 02-18-2012, 01:03 AM   #14
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floor joist attached to side of beam vs. on top


Clutchcargo had it in post #3: tension tie, toward the bottom: https://docs.google.com/viewer?a=v&q...WvZygC-vGi-JoA
Unless the diagonal shear-nail hangers work for the engineer on the plans.

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