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An insulation product’s R-value is an indicator of how much thermal resistance it has. Those with higher R-values boast stronger insulation performance. Products labeled R38 are typically used to insulate attics in homes within the US Department of Energy’s climatic Zones 1 to 5. R38 insulation products are strong enough to keep heat from building up in your attic and to prevent damage to your roof. Upgrade the insulation in your attic with our R38 products. We’ll be happy to give advice on the best product for your application. Choose Pacific Insulation Supply for quality R38 insulation products at excellent wholesale prices!