Can I use paving stones over an existing surface?

In a simple answer, Yes, you can (but under certain criteria). If the condition of the existing pavement is in poor state (major cracks, heaving, settling, potholes, etc.) it may be a better solution to start over and build the base system up properly. Also, do you have enough threshold clearance to accept a 2 3/8 thick paver plus the 1 sand bedding course? (a total of almost 3 ) Another consideration is how will you adjoin the pavers to meet other existing pavements? (garage surfaces, sidewalks, etc.)

• Add a woven geotextile fabric over the existing pavement and under the sand bedding course. This will protect the sand from migrating into existing/future cracks and failures of the previous pavement.li>Use an adequate edge restraint to hold the pavers and sand bedding course (this may require addition construction outside the area of existing pavement).
• Remove enough of the existing pavement to allow the pavers to gradually taper down to adjoining surfaces. Also excavate enough material to allow proper thickness and compaction of base material to support anticipated traffic.