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Message: [QUOTE="iri10, post: 2916225, member: 1781"] For the attic, at least, you can overcome the stud width limitation for batts by stacking a second layer on top of the first. From what I gather, when people do this they lay the second layer of batts perpendicular to the first (covering both the first layer of batts and the studs). And the 2nd layer can't have a vapor layer like the original layer does. Has to have no barriers on either side. I suppose there are possible complications if you have, for instance, soffit vents in the attic. Might need to install some extra hardware to make sure the airflow of those vents rises clear over the layers of insulation. edit: Whoops, tomtom80 already said all of this. Oh well, I'll leave my message here to be a monument to my lack of paying attention. :cool: [/QUOTE]