so an important question is mechanical versus adhesive fastening. Screw vs Goo, if you will. Without being responsible for the installation personally, I am more comfortable spec'ing mechanical fastening. I'm thinking to fasten the lams of plywood at 8" centers EW, and secure it to the slab with flathead tapcons at 24" OCEW, with 3/4" embedment. <br>
<br>A remaining question is resistance of the foam to insect infestation. This suggests a rugged vapor barrier over the slab--as for insect supression as for vapor migration. (in this case the basement is well drained, with little risk of significant bulk water anywhere.)<br>
<br>AA<br>