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My suggestion is that you plan a gala night of whipped cream and mirrors, or whatever your husband is into, to jolly him up for the idea that he is totally 100% incorrect on this one
What he would be building would be a saggy mold sandwich, also quite likely a rodent farm. Also no protection from anything that wants to dig under the walls to get in.
Without good air circulation under there, it will get Real Real Damp (from natural ground moisture, which yes there is even if you live in the desert, as well as from condensation due to temperature differences). Assaulted by near-100% humidity from below plus somewhat damp litter (poo, and occasional waterer spils) from above, I absolutely guarantee that even if you caulk the heck out of things, there will soon be SOME crevice through which moisture can penetrate to the pressboard. Moisture turns pressboard into oatmeal. Moldy oatmeal. Furthermore, this construction will be real real hard to fix once the problems sit in -- not only will you have to jack the whole thing up onto cinderblocks which for a walk-in coop is a significant physical challenge plus a significant strain on its structure, you will have to replace the floor which, if you follow typical construction practices, will be sandwiched under the wall sills and thus the edges will be inaccessible for removal.
If you want a wooden floor, raise the whole enchilada up on cinderblocks at the corners so that it sits a foot or more above the ground . Unless the chickens will have access under there - and if they will, consider how *you* will have access to them under there - it would be smart to put down landscape fabric under gravel, or something like that, to discourage weeds underneath the coop. And I would suggest using actual real plywood for the floor -- it is not a situation comparable to flooring underlayment in houses, because the dampness quotient is so much higher. Also don't plasticize *both* sides of the floor, just one or the other, otherwise it accellerates rot.
If OTOH you want the coop on the ground, do not do the wooden floor. Instead, either a) pour concrete (ka-ching) or b) set pavers FIRMLY AND SQUARELY over a good gravel and sand bed, preferably extending out a couple feet around all edges of the coop to discourage digging, or c) have a dirt floor, but make some sort of VERY digproof barrier all around the bases of the walls (pavers, or buried pavers, or buried flashing -- personally I would not trust buried wire as even galvanized wire will rust and disintegrate, and it's not like it'll be easy to replace. unless it's laid as an apron which would be ok)
Good luck (especially with the husband end of the equation <g>),
Pat
