Re: Not Thinking Clearly About a Subfloor
the dri-core product is great, ive used it several times and prefer it to laying 2x4 sleepers then laying foam between then sheathing it. and yes to framing the walls first, dont forget to use pt lumber for your footers or put plastic under it so its not in direct contact with the concrete floor. if you still want a finished floor in the utility room, ceramic tile direct to the concrete is the simplest most durable
myself personally havent done the foam down first then plywood tapcon it down. i have several friends who have tried it and found it very slow and the tapcons dont always grab.
fire up the saw and make some dust