TJI Saggy Floor Fix? - Construction - Contractor Talk

TJI Saggy Floor Fix?

 
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Old 07-05-2010, 06:59 PM   #1
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TJI Saggy Floor Fix?


has anyone ever taken a 14" tji and ripped it in half for strengthening floor joists?
the house we just bought has 2X6 floor joists for the first floor and 2X4 second floor
assume there will be loads of pl and a couple million screws involved
span is just over 10'
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Old 07-05-2010, 07:02 PM   #2
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Re: TJI Saggy Floor Fix?


2x6 and 2x4 floor joists?

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Old 07-05-2010, 07:03 PM   #3
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Re: TJI Saggy Floor Fix?


Did you say 2x4 floor joists??????????????
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Old 07-05-2010, 07:06 PM   #4
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Re: TJI Saggy Floor Fix?


well, what do you think of my tgi sandwich?!?! the only reason i want to do this is because i have 4 skids of tgi at my shop
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Old 07-05-2010, 07:07 PM   #5
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Re: TJI Saggy Floor Fix?


I would be wary of ripping the tgis. The tension on the bottom and compression on the top chord/flange is what makes them strong. Perhaps use lvl? Good luck
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Old 07-05-2010, 07:10 PM   #6
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Re: TJI Saggy Floor Fix?


TJIs are designed for loading with the top and bottom flanges intact. Ripping any I joist would render it useless. LVLs however can be ripped and will still have the capacity to carry a given load, although much less than if left untouched. One of the yards I dealt with in the past stocked 7 1/4 LVL material, however, the load capacity should be checked by an engineer.
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Last edited by loneframer; 07-05-2010 at 07:15 PM. Reason: spelling
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Old 07-05-2010, 07:10 PM   #7
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Re: TJI Saggy Floor Fix?


If i'm not mistaken all of the strenght of the TJI is in the top and bottom cords. I am not an engineer but I would suggest that this will not fix the problem than you have.
Consult an engineer or local building official to help you!
Good luck Chad
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Old 07-05-2010, 07:14 PM   #8
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Re: TJI Saggy Floor Fix?


The above advice is correct, TJI's ripped in half are useless, except for fire wood.

Just curious, was there a codes official in the area when this house was framed?
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Old 07-05-2010, 07:15 PM   #9
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Re: TJI Saggy Floor Fix?


i know the way a tgi works, compression and tension, thats what makes me believe by laminating both sides of an existing joist , flush and tight to the second subfloor, glued and screwed a million times, the second subfloor should act as the compression side of the joist, and the bottom chord can be toescrewed to the beam on one side and ledger on the other

LVL is 5$ + PLF ... ill be 6k in LVL alone---
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Old 07-05-2010, 07:16 PM   #10
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Re: TJI Saggy Floor Fix?


Quote:
Originally Posted by EPD View Post
has anyone ever taken a 14" tji and ripped it in half for strengthening floor joists?
the house we just bought has 2X6 floor joists for the first floor and 2X4 second floor
assume there will be loads of pl and a couple million screws involved
span is just over 10'
Call the TJI company and ask them because no-one here could possibly give you an answer unless they had then same question and called TJI. I can tell you my thoughts are there's no way in hell you can do this.
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Old 07-05-2010, 07:17 PM   #11
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Re: TJI Saggy Floor Fix?


no code in 1940 around here - seems like the only thing they did right back then was a foundation!
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Old 07-05-2010, 07:17 PM   #12
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Re: TJI Saggy Floor Fix?


Doing it the correct way doesn't always equal a low price.

I would not use the TJIs either.
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Old 07-05-2010, 07:20 PM   #13
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Re: TJI Saggy Floor Fix?


Quote:
Originally Posted by EPD View Post
i know the way a tgi works, compression and tension, thats what makes me believe by laminating both sides of an existing joist , flush and tight to the second subfloor, glued and screwed a million times, the second subfloor should act as the compression side of the joist, and the bottom chord can be toescrewed to the beam on one side and ledger on the other

LVL is 5$ + PLF ... ill be 6k in LVL alone---
You'll spend 3 times that in labor to remove them and replace with something that will work.

If you want to jury rig it, rip 3/4 plywood and sister it to the joists on both sides, splitting the breaks by 4'.
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Old 07-05-2010, 07:23 PM   #14
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Re: TJI Saggy Floor Fix?


Quote:
Originally Posted by EPD View Post
i know the way a tgi works, compression and tension, thats what makes me believe by laminating both sides of an existing joist , flush and tight to the second subfloor, glued and screwed a million times, the second subfloor should act as the compression side of the joist, and the bottom chord can be toescrewed to the beam on one side and ledger on the other

LVL is 5$ + PLF ... ill be 6k in LVL alone---
Well, maybe. Sounds like it could work. I don't know if there is enough face on a 2X4 to get enough screws and glue in there?

I wouldn't do it without an engineers input. Too many variables.
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Old 07-05-2010, 07:27 PM   #15
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Re: TJI Saggy Floor Fix?


labour to remove - very good call !! there is a small section of floor in the back corner of the house beside the stairway- im going to give it a whirl, you know what its like when you get an idea, you need to at least try it, i knew 100 percent that i would get 100 dont do responses but thought id get at least one - i tried it and it
worked!!
im going to phone the engineer in the AM
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Old 07-05-2010, 07:29 PM   #16
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Re: TJI Saggy Floor Fix?


ill also be ripping an eighth off the one side of the bottom chord so i can glue and screw the two layers together
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Old 07-05-2010, 07:30 PM   #17
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Re: TJI Saggy Floor Fix?


use plate steel-push the sag out of the floor and bolt it onto the existing floor joists. I'm guessing you mean 'real' 2x4, so 4" and 6" thick joists; you'll be better off making both floors at least 5.75" tall steel-leave the 1/4" for 'fudge' room and be sure to jack the joists straight (reinforce floor below BEFORE jacking) before bolting or you'll have an awful crown.

final solution is to sister 2x8's up to the existing-you lose a little headroom, but the span table for #2 shows you'll get L/480, so it will be nice and stiff as compared to what you have now.

go with the steel....
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Old 07-05-2010, 07:32 PM   #18
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Re: TJI Saggy Floor Fix?


If I understand your idea, the bottom cord will hang below the joists that are existing? And you'll sandwich both sides? Why not just laminate a 2x4 to the bottom and call it a day?
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Old 07-05-2010, 07:33 PM   #19
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Re: TJI Saggy Floor Fix?


Quote:
Originally Posted by EPD View Post
labour to remove - very good call !! there is a small section of floor in the back corner of the house beside the stairway- im going to give it a whirl, you know what its like when you get an idea, you need to at least try it, i knew 100 percent that i would get 100 dont do responses but thought id get at least one - i tried it and it
worked!!
im going to phone the engineer in the AM
Hopefully that same inspector from 1940 is still on the job.
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Old 07-05-2010, 07:35 PM   #20
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Re: TJI Saggy Floor Fix?


i have done both in the past , but what the hell am i going to do with all these TGI S!! lol
i have plate coming for the main beam of the house,

gotta love power of sale!!!

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