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Old 02-06-2010, 11:48 PM   #16
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what size beam for jacking up floor joists


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Originally Posted by ponch37300 View Post
This sounds like a good method. I have 4 jack posts right now so I can get one more and then will have enough to jack one truss up and also have 2 beams so I can just keep going. This idea eases my questions about raising one beam at a time. Thank you all for your suggestions.
Why do you need a fifth?

And I'm even going to modify the suggestion just a little bit...

First of all I said something about blocking the joists together... well you can't do that until AFTER you've sistered new joists to them.

So here's a modified suggestion:

1. Use the beam and two jacks to jack the 2nd joist (and several after it) on the slope previously discussed. Make sure the 2nd joist is jacked to the final height desired.
2. Use a 3rd jack to jack up the joist to be sistered.
3. Sister the joist.
4. Add blocking from the 1st to the 2nd joist.
5. Remove the 3rd jack.
6. Use the 3rd and 4th jack to jack up the 3rd joist (and several after it) on the slope previously discussed. Make sure the 3rd joist is jacked to the final height (watch out for the 1st beam to make sure it doesn't fall).
7. Remove the 1st beam.
8. Return to step 2 (moving down a joist each loop).

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Old 02-07-2010, 12:46 AM   #17
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what size beam for jacking up floor joists


Well the little picture in my head for the five posts was 1 to jack up the joist I am working on, 2 for a beam on the next couple of joists, and 2 more for another beam which will be put in to move the first beam. This resulting in not having to move the first beam and let the joists down without supporting the next couple joists. This way I can keep alternating the beams everyother joist all the way down and the next couple beams will always be supported. I just have a fear of letting down the beam to move it, raising and lowering and raising the joists over and over. I would think it would be better to raise once and keep them supported till they are all supported.
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Old 02-07-2010, 02:09 AM   #18
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what size beam for jacking up floor joists


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Originally Posted by ponch37300 View Post
Well the little picture in my head for the five posts was 1 to jack up the joist I am working on, 2 for a beam on the next couple of joists, and 2 more for another beam which will be put in to move the first beam. This resulting in not having to move the first beam and let the joists down without supporting the next couple joists. This way I can keep alternating the beams everyother joist all the way down and the next couple beams will always be supported. I just have a fear of letting down the beam to move it, raising and lowering and raising the joists over and over. I would think it would be better to raise once and keep them supported till they are all supported.
Your basically doing just that with the plan I've tried to outline. Basically, you use one of the jacks that will be used for the second beam on the 1st joist. When you bring that jack down off the 1st joist, the joist will already be in position never to be moved again. Then you've got both jacks available to setup the second beam while the 1st is in place. This should really be the case if one side of the beam already has the next joist upto it's final height. When you take the 1st beam down after the 2nd beam is in position, the "next" josit to work on should pretty much be in position.

Now you are correct that when you take the 1st beam down, the joist you are going to work on next will drop ever so slightly. Hence the need to use a jack on it. But I don't think the amount is going to be much of anything at all.

And like I said, you could modify it such that the beam is holding the joist you are sistering and the next set. That way, when you put the 2nd beam into position, you'll be moving the 2nd joist into postion (but again, watch out for the 1st beam trying to fall).
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Old 02-07-2010, 08:55 AM   #19
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what size beam for jacking up floor joists


hooKooDooKu, I think we are talking about the same thing, just in different ways. I think I understand what your saying and maybe I"m worrying to much about the joists around the one I'm raising. I think with the advice you guys have givin me I have a pretty solid plan of attack and should be good to go. The real challange is going to be doing the joist for the second floor sometime down the road, not looking forward to opening up the ceilings to do them.

Thanks again to everyone for all your suggestions and advice.
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Old 02-07-2010, 09:13 AM   #20
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what size beam for jacking up floor joists


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...The real challange is going to be doing the joist for the second floor sometime down the road, not looking forward to opening up the ceilings to do them...
Ouch! I had enough problems and made enough of a mess just working in a basement with a HVAC ducts in the way... but that was about it. But I must say that you don't back down from a challenge. Good Luck and do it safe.

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