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Old 08-09-2012, 08:38 AM   #16
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Sister Joists Without Leveling Floor


Ok, so I have added a couple pictures to help visualize what I mean:

As you can see there is a i-beam laying sideways on top of the joists.
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Old 08-09-2012, 12:39 PM   #17
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Sister Joists Without Leveling Floor


Some questions;
How far along the span of the floor joists is the steel beam - 1/3 way,1/2 way or what?

What is it supporting, and is it actually pressing down on the 2x6 joists?

Is your SE aware of this beam?

Assuming the beam has been added later, unless it is close to the end of the span of the 2x6s, it will have weakened them and contribute to the bounce in the floor.
I'm going to stick my neck out here and risk a lot of stick from others, but I wonder if the floor could be stiffened a little by fixing something like 4x4 steel angle to the side of every other joist - just a thought.
The solution to this may well lie outside code stipulations and will probably have to be designed/calculated by the SE.
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Old 08-09-2012, 12:50 PM   #18
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Sister Joists Without Leveling Floor


The I-beam is about 6' into the total span of 15 feet.

The beam supports the subfloor/floor above it. It basically falls right in the middle of a bedroom that is above it. I can't really tell if the beam is resting on the joists or not, or if the joists are holding up the beam. I am inclined to believe that the beam is actually being held up, at least in part, by the joists. So, methinks the I-beam is actually pushing down on the joists, but I have no way of really knowing.

I told my SE about it over the phone, and he is coming over in about an hour to look at it. I'm a bit curious, and nervous, to hear what his solution might be.

The beam was added, I believe, when the upstairs area was refinished from an attic to a bedroom.

I will say this, the upstairs floor is not bouncy, at all. There is some sag however, but not a lot on that side of the house.
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Old 08-09-2012, 04:50 PM   #19
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Sister Joists Without Leveling Floor


The Conclusion, for those that are curious....

Ok, the SE came by and told me that he still reccommends sistering on the 2x10s. It was his opinion, that the 2x10s should be butted up against the bottom of the I-beam, and not notched. The beams will be nailed to the 2x6 existing joists, and held at the ends by a 2x6 ledger.

He said he had never seen this situation before, but has seen plenty of "hillbilly engineering" in the past. lol!
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Old 08-10-2012, 01:34 AM   #20
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Sister Joists Without Leveling Floor


Hillbilly engineering (aka 'cowboy engineering') often works, and it's impossible to prove how/why.
I've recently seen a chimney stack taken out into an attic space with all the remaining brickwork above propped up off a piece of 2x3 - and it worked!
Good luck with the floor.
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Old 08-11-2012, 11:51 AM   #21
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Sister Joists Without Leveling Floor


Can't really tell from the pictures but it looks like the steel flanges are notched into something, (hopefully not the joists), or have been filled in above the jousts, (looking at some darker colored material).
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Old 08-11-2012, 12:01 PM   #22
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Sister Joists Without Leveling Floor


Quote:
Originally Posted by Duckweather View Post
Can't really tell from the pictures but it looks like the steel flanges are notched into something, (hopefully not the joists), or have been filled in above the jousts, (looking at some darker colored material).
Agree not too easy to see, but OP did say in post 12 that the joists had been notched with slits (!) to take the downstand flanges of the steel.
As this is about 6ft in from the support, It made me wonder how the joists have managed this amount of cut-out without being overstressed or deflecting too much.

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Old 08-11-2012, 02:49 PM   #23
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Sister Joists Without Leveling Floor


Ooops, I went to last post, never noticed there was a page 2. possibly a tight enough cut so compression is keeping them up. That, or trick photography and American ingenuity. Obviously the joists were the 10% that didn't get the engineering memo that they don,t work. Are those 2 x 6's on the flat above the joists or is that on pg1? They must be doing something to help out. My guess is anything you can do is better than what you have.
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Old 08-13-2012, 04:40 PM   #24
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Sister Joists Without Leveling Floor


Hey guys, I see my thread is still alive!

SO to answer some questions:

Yes, the I-beam was notched into the 2x6s. The SE says he had no idea why they would put in an I-beam like that, but someone did, and it wasnt doing much, and was probably more detrimental than anything.

The boards laying perpendicular to the joists, that are on top of the joists, are a bunch of 2x4s that appear to have been placed there to level the floor to the top of the i-beam (because the flanges of the ibeam also stick up above the joists.

Anyway, I have since sistered on 2x10s onto each of the 2x6 joists (see the attached pic). I first jacked up each joist, and then nailed and glued the 2x10s on, per the specs called for by my SE.
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Old 08-13-2012, 04:54 PM   #25
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Looks good. Should now last another hundred years.
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Old 08-13-2012, 05:12 PM   #26
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Sister Joists Without Leveling Floor


Thanks Tony!

It was a HELL of a lot of work, but it looks great, and you can really feel the stiffness in the second floor now. I guess i didnt realize there was some bounce before!

I did manage to crack a couple tiles in the 2nd floor bathroom shower, but all the plaster stayed in tact! YIPPEE!

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