R value refers to thermal resistance.
Cheap wall insulation ideas.
While insulating your attic space with foam can be an effective way to lower heating costs you can use a simple reflective foil material as a cost effective alternative.
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By stapling the foil sheets to your attic roof rafters you can reflect the heat that hits the rafters back down into your home s living space.
Fiberglass roll insulation fiberglass roll insulation is the cheapest and easiest type to install provided that your garage s interior walls have not been constructed.
Department of energy recommends unfinished attics.
Polyiso boards are pricier than other types of insulation because they offer an r value between 6 and 7 per inch a big advantage over fiberglass cellulose and other rigid board products.
Cellulose insulation is a recycled loose fill insulation that can be blown into walls and attics making it the ideal choice for garages that have been finished.