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Old 12-22-2011, 12:20 PM   #1
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Sagging beam replacement


Curious to get some thoughts from the pros on this board on what I am doing.

I have a 2nd story room that hangs out about 6' over a garage. I have included a drawing of the layout of the joists and the room above.

My question is: Can I simply replace each joist 1-by-1, whilst supporting the neighboring joists? I'm thinking about using stronger joists like LVL to avoid this problem in the future. Or I-joists, perhaps.

As supports whilst replacing the 2 x 12s, I was thinking about using a 2 rows of 4 bottle jacks and 4 x 4 posts.

Any thoughts or better ideas?

Thanks for any ideas you may have.

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Old 12-22-2011, 01:16 PM   #2
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Sagging beam replacement


Why not just sister new joists next to old ones?

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Old 12-22-2011, 02:45 PM   #3
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Sagging beam replacement


I like the idea. Do you happen to know if that would pass a home inspection?

...not being critical, i just don't know.
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Old 12-22-2011, 02:55 PM   #4
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Sagging beam replacement


If one set passed, adding a second set is sure to also pass.
I would use constrution adhesive and through bolt them with Carrage bolts to pull them up tight. I find it easer to clearance drill the new ones before lifting them in place.
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Old 12-22-2011, 03:02 PM   #5
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Sagging beam replacement


Ok, so surely I would have to add another set of wall studs for this new sister joist to sit on??
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Old 12-22-2011, 03:25 PM   #6
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Sagging beam replacement


A 2" sag seems like a lot to me.
Might want to check if what you are going to sister on to the existing will provide the right support for the live load given the span.
Also, is the supporting wall the joists rest on properly structured? Just asking.
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Old 12-22-2011, 03:55 PM   #7
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Sagging beam replacement


Well I haven't removed all the sheetrock from the wall, but I did take a small section out and the only thing I noticed was that the joist was not directly sitting over a stud. Don't know how much that matters.

If I sistered a new 2 x 12, the full length, would I have to make a new stud for the sister to sit on?

** Also, the actual sag is probably more like 1-3/4", so not AS bad, but still bad.
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Old 12-22-2011, 06:36 PM   #8
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This is fairly new construction built with 2x6 studs, right? Was this not designed for a load overhead to begin with? Why is it sagging? What is the span of the 2x12s?
With a single top plate, I would sister the studs as well.
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Old 12-22-2011, 07:16 PM   #9
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I am not surprised the joists area sagging with that structural design.

Did you design this yourself?

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Old 12-22-2011, 08:59 PM   #10
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Sagging beam replacement


I'm glad someone can see the glu-lam, LVL, or paralam missing under the bearing wall carrying 1/2 the roof load plus snow......
At minimum since '76, double joists under bearing running walls (without that mega roof load); http://publicecodes.citation.com/ico...002_par008.htm

Nice drawing though!

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Old 12-22-2011, 10:39 PM   #11
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OK, I am just a little thick here, is that a cantilever or are the outer ends of the floor joists supported?
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Old 12-22-2011, 10:55 PM   #12
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Quote:
Originally Posted by AndyGump View Post
I am not surprised the joists area sagging with that structural design.

Did you design this yourself?

Andy.
I greatly appreciate all the constructive comments on this board.

To answer your comment/question, no I did not design this structure. I inherited it.

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Old 12-22-2011, 11:04 PM   #13
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only the finest.

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Old 12-22-2011, 11:06 PM   #14
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OK, I am just a little thick here, is that a cantilever or are the outer ends of the floor joists supported?
no, sorry, that's just where I ended my drawing.

The joists just continue on out over a 2-car enclosed garage. They are not sagging. Only the 4 joists in yellow are sagging.
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Old 12-23-2011, 12:08 AM   #15
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Sagging beam replacement


Thanks Reload, I understand now. If that were my job I would support all the way to ground or foundation in each wall under the weight bearing wall. I would install a beam that is rated to handle the load of the roof and if it didn't take the swag out of the floor joist I would sister them with LVLs or similar.

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