Can interlocking floor tiles be installed over carpet?

Interlocking floor tiles are not preferable used over carpet. The best surface to lay tile or any other flooring product is on a firm and solid surface that out give. Carpet goes down when you step on and makes it so the interlocking tiles will eventually come unlocked by stepping on it. I would not recommend that you install any type of flooring until your carpet is taken out. However if your looking for a good interlocking floor tile I would recommend Swisstrax. They have a great product. And they are great to work with.

Sources:

www.swisstrax.com

www.bigfloors.com

www.racedeck.com