Says otherwise here though: http://dricore.com/nw/subfloor_faq.php
Q: Do I glue the seams or install plastic on concrete before laying down DRIcore subfloor panels?
A: No. Gluing the panel edges is not recommended. The panels are intended to expand and contract with the seasonal temperatures of the basement. A vapour barrier over the concrete surface is not recommended. The built-in high density polyethylene membrane is the moisture barrier on the underside of the panel which allows incidental moisture to dry easily. Normally, its not necessary to apply paint or sealant to the concrete floor before laying DRIcore subfloor panels.