I noticed my standing cabinets in the kitchen or tilted and the double oven cabinet at the top part is over an inch away from the wall now.
The cause is bowing I-joist in the basement, just 2 of them in an area, where they were exposed to moisture from a leak in kitchen.
The I-joists are around 21 feet long and I was wondering if there is any way to jack them up and add some support/fix them. I was also thinking of adding a metal beam across the basement oposit to the i-joist direction for support. the lenght would be just over 30 feet.
I think there is a metal beam that is running paralel to my joist in the middle of the basement in that area. it is covered in dry wall so I dodn.t exactly know what it is. the whole 21x30 feet area is open without any metal posts and I want to keep it that way.for some reason the direction of I-joists in the rest of the basement is oposit to these I joist and there are a few mwtal beams well hidden in walls.
any help would be appreciated.
Thanks,
Hamid

I don't know exactly what you mean by "bowing"...usually that term describes something that has deflected laterally, but I suspect what your joists are doing is "sagging" vertically. My guess is that they are permanently damaged. Putting in another steel beam isn't a good idea, because whatever supports it will need large footings. Probably what you need to do is install new joists alongside the damaged ones, and jack up the floor using temporary solid wood joists.

It's hard to understand the structure of your floor from your description, and I think this is definitely a case where a competent architect or structural engineer ought to see the structure first-hand, get a broad overview of the entire floor structure, and recommend the best possible remedy.

How old is the house? What caused the water leak and how long was it leaking before you discovered it? Are you sure the water was the cause of the bowing? Just incorrect drilling and cutting out of the web between the small blocks that run the length on the top and bottom of the beam could cause this bow. Even cutting these little square blocks anywhere can compromise the I joist and void any warranty. Because of the water issue possibly has damaged the beams under the kitchen or perhaps caused acceleration of this movement you may have an insurance claim, check with them which is why you have insurance. If the water has been leaking long enough to cause them to become damaged to a point in which they bowed there are several other issues you should be worrying about as well. Things like mold rot damage that could be hidden. Once the beam warps like you say it’s an indication that the structural design of the I joist has been compromised. Not a good thing.
You should put some short term bracing under them. The word being short term. There are manufactures standards on how these beams should be repaired braced, supported and fastened. And unless the carpenter understands these repairs and how these I joists work under tension and compression. He or she could do additional damage to the structure.
I also assume by this description of the flooring joist and beams that you’re experiencing some deflection of the floor perhaps some moving or bouncing throughout the floor area? And most likely cracked tiles and grout? Yes a beam can be placed at a right angle to the floor joists to shorten the span thus making them more stiff. But again you need a professional to come to the house to determine what loads would be on the beam and I joists and where to place any footing and size it for the correct support of this critical framing member. Not having the correct information we could not determine what size of beam would be needed and how it should be supported nor could determine what necessary repairs would be required to fix the assumed water damaged I joists.
One last thought. On the side of the I joists should be printed the Manufactures name. Once you have this information contact the local lumber yard for the local field rep of these joists and ask them to visit your home. These I joists carry some pretty good warranties and you will find that the company would send a person out to evaluate the condition of the I joists and perhaps suggest someone to make the necessary repairs.

Thank you very much for the replies. I will try to answer questions that came up.
1. the house is 10 yesrs old and I bought it around 8 months ago.
2. the water damage was from leaking instant hot water.
3. Now I am not completely sure if the cabinet was tilted when I bought the home or not, there are no cracks in the tiles, the tiles were put in when the house was built and the neighbors confirmed that, the floor is leveled, except for where the cabinets are.
4. all the holes for plumbing are in the middle of the web not close to the flanges and they are not large ones.
5. the deflection is only one inch or less at max.
6. the subfloor woods looks pretty clean, when I noticed the leak I turned off the water until it was fixed, so the water damage was not a long damage, but that is the only explanation thati could come up with.
7.I had a contractor in my home and he said that he will lift my cabinets and put some support under it, that was not a real fix for me.
8. and I don't realy know how long the warranty for the I-joists is.
9. doubling the I-joist will meaan that I will have to take the plumbing apart.
10. one last wishfull question, could i just leave it the way it is and left up the cabinets.
Thank you very much for the replies and for any other help in advance.

I would suggest that you shim up the cabinet. You cannot lift the I joist without cracking the tile.
This means the floor was that way when they did the floor. Thus the I joist was bowed long before the leak occured.
I would still contact the local vendor to see if any additional braceing is required. Even if it means that you have to disconnect the plumbing and electrical and sister the I joist as per the manufactures requirements. Yes they have a special method of doing this. You simply cannot fasten a new board to the side. A blocking must be fit into the web then another if needed joist is then placed next to the questionable member and bolted into place. Check with the manufacture for this method.
As far as a warranty. I truss manufactures sometimes carry a lifetime warranty on performance. This is IF they installed them correctly in the first place and that they did not cut, modify or change the suggested method of install and storage. .