There are floor-leveling compounds available at any home center that basically pour more smoothly and more liquidy than concrete. Gravity basically levels them out, unlike cement or concrete which require a trowel. Note, though, that they are not as strong as concrete, so they should be used only for light skim jobs to level the floor, not for filling in deep holes or to fill wide cracks. You might need to just re-pour the floor. It is difficult to make the judgment call from only a brief verbal description.

You also could patch the large holes and cracks with cement of a similar consistency as your current floor and then pour the leveling compound over it to seal it and conceal the patchwork.

[This message has been edited by Lawrence (edited March 14, 2002).]

If you have cracks as large as seven inches across I would recommend you pour at least 3" of new concrete on top of the existing floor. If loosing the 3" of headroom is not practical the only other alternative is to remove the old floor first.

It would be a good idea to use fiber reinforced concrete for this job to help prevent future cracking. The fibers are added at the concrete plant so no additional work is required although the cost of the concrete is slightly higher than without the fiber. Using welded wire fabric reinforcement is another possibility but will cost about the same and requires more work. Whichever you decide to use, if you have never worked with concrete before, you will want to hire a professional concrete finisher to do the work.