Answer: As long as your existing patio is in good condition, you can place pavers over the top. There can be cracks in the old patio as long as it is still level and has not "heaved" up in any areas. You will still need to retain the border of your project. Since you will not be able to stake in an edge restraint around it, a heavy-duty silicon based construction adhesive is recommended. Use this on the bottom of your border stones only to adhere it directly to the existing concrete. IMPORTANT NOTE: Any time your are overlaying an existing patio it is important to recognize how much room you have between the existing patio and the threshold of your door. A typical paver is 2 3/8 inches tall. There has to be enough room for you to overlay the patio without raising the new level above your door's threshold. If a typical paving stone will not work for you, check with your local dealer about ordering one of the thinner overlay pavers.
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