Hi and thanks for using justAnswer.com.
You will need to provide some cushion to prevent rocking/cracking of the pavers. Full support via thin set is one option, a bed of sand is another.
I hope that this information was helpful to you. If it was please remember to click "ACCEPT" on your screen to make sure that I am paid for my efforts. By clicking ACCEPT you are not giving up your ability to ask more questions pertaining to this subject, and I will be happy to respond to these as well. Please take a moment and leave feedback, it is very important!
General C&ontractor
35 years of troubleshooting construction, remodel, component & material failures. What to do next