Has any one used drycore sub flooring?

This the product that is 24X24" press board that locks together, but has a hard vinyl underlay attached. I used some in my iso booth and I'm planning on laying a layer of 1/2 fatigue mat (rubber) then a layer of 3/4" press board (tounge and groove) on top. Room height is a major concern here so I'm trying to preserve as much as possible. If this method is ok I'll use it on the rest of the project, I am looking into a vapor barrier and full sheets of pressboard to replace expensive drycore and have less joints.

Hi, and welcome; first, can you work on following this http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3231 a bit more? The link will explain why it's necessary, thanks... I would be careful of using particle board at all in a studio; sealed up, all those formaldehyde fumes can make you sick - and the stuff can outgas for months, possibly years. There are non-formaldehyde versions, but not really common in most areas. Specialty panels are almost ALWAYS 'way more expensive for sound control than just basic MASS, used in the right places - the link above will also guide you to a few discussions on that. After you read through some of the material on the above link (and edit your profile to include a location) I'll be glad to try and answer any questions still not covered... Steve