Sagging kitchen floor

thanks for the replies,

I believe the floor joists are 1-5/8 x 7-1/4 inch. They're definitly not 8 inches I'd have to measure it tonight.

The distance from the cinder block wall to the post in the middle of the basement that hold 3 2x12's is about 10-11 feet.

The kitchen components that sit at the backwall are a 5foot long countertop, the cabinets above it, the sink, and a standalone pantry.
The frig and stove are not an issue.

There are no cracks in the basement walls/floor. It also is not a mud floor. The contractors that did the kitchen put some type of board over the subfloor that the tile sits on.

This may be a dumb question, but if Iwere to get a pro's opinion, exactly what type of engineer do I look up? Is there a 'structural engineer; klisting in the yellow pages?

The crawlspace from which the cantilever extends into is about 2 1/2 tall. Hard to work in but there is room to crawl around and inspect things.

Again,thanks for the replies.

I don't know the actual extent of the sag. It was noticable when the old kitchen was removed and you could see the difference between the end of the kitchen floor under what used to be the old cabinets/sink and the start of the addition floor. Could be the sag is 1 inch rather than 2. I do know when they installed the kitchen cabinets (the part under the countertop) that they added some wood at the base so it sat level and they screwed it into the wall joists so it was installed level.

It is noticable as you walk from the kitchen island to the sink. It's hard to show in a picture. Although if you look at the attached, which is the left wall of the kitchen moving towards the pantry you can see the growing gap between the tile and the addition flooring.

I have gone into my basement and shined a flashlight into the cantilever area and haven't seen cracked joists. Underneath the addition, the joists are covered by what may be 3/8 inch plywood so I can't inspect them from there.

I asked the contractor who did the kitcken/addition what he thought about the sag. Maybe as he was almost finished the job and didn't want to get further involved (just a guess) he said that the house has survived this way 40 years so it may not be a real problem. He said it never should have been built that way and they probably should've doubled up onthe 2x8 beams.

I'm wondering if jacks can be used in the crawl space under the addition to get it backto level and then maybe some extra 2x8's can be slid in from the basement and sistered to the existing beams?

Maybe because I'm aware of the sag it just sits in my mind. I am thinking about what someone said here and hiring a structural engineer to inspect it and let me know how much of a problem I have and what types of solutions are available. But I've never done thta before and not 100% sure how to go about it - just go in the yellow pages under engineers? I'm assuming having someone just look & analyze it wouldn't be a huge expense.

UPDATE for anyone still around:

Today I went in the crawlspace and the old addition cinder block foundation runs under the cantilever (I have no idea how deep those cinderblocks go) . On one end the plywood that covers the bottom of the cantilever pretty snugly, but the other end has a gap that runs from 1 1/2 inches at the base and 1/2 inch at the end. I was thinking of filling that gap in with cement.

I dug a 4 ft level into the ground until it sat level and measured the distance from the top of the level to the plywood that covers the bottom of the cantilever beams. I measured it at the base , 1ft from it, 2 ft from it, 3 ft from it & at the end (41 inches from the wall). I did that for most of the joists. At the worst there was an inch gap, but most of the beams showed about a 3/4 in gap. Turns out I also used 2x8's, not 2x6's, for those piers I put under there last year.

QUES: About sistering in 2x8's (about 10 ft long) in the basement. I could just try and hammer it in as deep as I can get it, but I don't want to force the floor up above and risk unleveling the countertop etc. But since I have an idea of the sag for those 41 inches past the end of the basement foundation, should I cut off a small triangular region from the top of each beam based on my measurements so I could get the joist all the way to the back of the cantilever?

thanks