I have a back porch that is finished from the ground up to waist level. Rest of the way up is screened. I've gotten pretty far closing it in. Have frame work inside the bay frames. Just ready to hang siding, which I've never done. Can I put this straight onto studs with a little house wrap? Or do I need to have a ply layer under it?? When I took everything down to the skeleton there was no sign of moisture under the finished bottom half. There will be several 48x48x3 areas between siding and siding stuff and inner drywall