I'm looking at purchasing racedeck for my garage. My floor is not in great condition, there are a few cracks as well as a 1 inch stepdown in the middle of the floor like maybe they added more concrete at some point. My question is, will the racedeck work on this stepdown portion? There is probably 1 or 2 inches of height difference between these two sections, will the racedeck work or not?
I just finished installing RaceDeck REVolution in my shop this week. My floor was in much worse shape than yours. The front of my building has an asphalt floor with a steep slope, several potholes, and it was very uneven. The floor in the back part of the building is concrete and it is in better shape, but there were several large cracks and 1/2 the slab was 3/4-1" lower than the remaining slab. The transition between the ashpalt and concrete was terrible. We used quick set cement to try to level/smooth the floor as much as possible, but it was far from being perfect.
If the uneveness of the floor keeps most of the tile from actually touching the floor, it will flex down when you walk/drive over it. It does not come apart though. I have a few low traffic areas that have up to a few tiles 1/2" from making contact with the concrete/asphalt. Without any weight the tiles float and the floor looks flat, with weight they flex to make contact with the floor.
From my personal experience, I wouldn't hesitate to put RaceDeck on your floor. I would smooth out the transition like Jorgen recommended. It probably isn't 100% necessary, but you will be happier with end result.
The RaceDeck is going to be the focal point of my shop, it took a really crappy floor and made it look real nice. I owe Jorgen some before/after pictures, I will post those up soon, right now I just have crappy pics from my cell phone with junk all over the place. I also tracked drywall dust all over it and haven't mopped it up yet.
Here is a picture taken from the front, looking to the back. All of the problem areas I told you about are under the floor in the area shown.
Here are some other random pictures of the floor: