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Message: [QUOTE="NJHusky, post: 2915743, member: 114"] Cost v. efficiency For the garage...are you insulating the walls and ceiling? Is the garage under the house/adjacent/stand alone? Is the garage heated or are you just trying to minimize heat loss in the attached house? For the attic, you must consider how it is currently vented. You don't want moisture in the attic, so typically you have a ridge vent or gable vent. So the theory is insulate the floor or the attic/ceiling of the house...the attic gets hot or cold, but not the house because of the insulation. If you are using spray foam on your attic they normally spray the roof joists, you are using that as conditioned space and need to be sure there is no other venting in the attic, otherwise you are insulating nothing. We just did what someone else suggested in the attic, we used 2 layers of batts.....it wasn't worth the extra cost of the foam and closing the vents.. [/QUOTE]