I've had my RD flooring in for over a year now and can't figure out how to get the centers from not lifting up on hot days... Basically its a four car garage and if I leave either garage doors up on a sunny day the middle of the garage will start to lift and form a triangular shape. It started happening when I first installed them so I figured I needed to trim the edges more to give them more space to expand but that still doesn't help. Also grabbed some weights and laid them on top of the lifting spots but it just pushes the lift elsewhere.

Called RD and they told me to pull all 4 cars out on a hot day and leave the garage open for several hours so they can expand and pull the cars back in. Doesn't help though just creates a bigger triangular hump in the center which goes away once the garage is closed for awhile which beats the purpose of having RD flooring...

Any suggestions or am I stuck due to the size of the four car garage?

 

thanks
just spoke to laurine and she gave me some ideas to fix the issue. will keep you posted.

 

I just installed mine and had an issue in the garage doorways too. I call RD and they walked me through the process. Empty garage, let sun heat up entire floor, make sure it doesn't expand into the walls (space 1/2" at least) or hit any obstruction. I had to replace a couple of the tiles in the garage opening because they kept lifting up. So far so good and no more lifting.