Hi Don,



First let me say something I neglected to say in my previous posts. You do not want to use foil-faced insulation board out in the open. It must be covered with drywall or another fire resistant covering. If you don't and your burn your house down you'll likely void your homeowners insurance.



Reflectix or other foil/bubble insulations can be used out in the open. But I think you can avoid that and I'm sure you don't want your room looking like the inside of a space ship



Secondly, don't worry too much about not having the reflective component (foil) on your walls. As I understand it the foil is most effective on ceilings and floors - horizontal surfaces. If you were starting from scratch I'd suggest it for the walls as well, but given where you're at I wouldn't fret over it.



You'd be better off spending the money to insulate the floor.



Now with that said, let me see if I have this straight.



1) There are two exterior walls which have batting and are drywalled.



2) Then there is one interior wall that is NOT insulated but is drywalled on both sides.



3) Then the remaining interior wall in NOT insulated by is only drywalled on one side and can still be insulated.



4) The ceiling has no insulation, no drywall.



Are one thru four correct?



If so, here is what I would do.



1) Insulate the already sheet-rocked wall. That can either be done with a blower or by tearing the drywall down on one side. I understand it's actually cheaper to tear the drywall down but if it were me I'd rent the blower.



2) Place batting into the back of the already insulated wall. The only issue with this is that you'll have to put the batting in "backwards" so the vapor barrier side is facing the snake room.



In that regard it might be best to buy some of the foil faced poly iso and shove it into those cavities. Again, keep the air space between the foil and the drywall on the snake room side.



4) Find out what code is for insulating the floor joists between your basement and first floor. To keep things simple you might go ahead and shove batting into the joists and then cover that with stapled on Reflectix. It will make it easier to go around those pipes and ducts. At least for now.



The potential problem here is that the Reflectix acts as a vapor barrier and there might be code against that in your basement situation. The concern is moisture getting trapped between the floor joists and causing rot.



5) Insulate the floor. I won't go into more details until I know you want to do this.
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