R-Value- What Does It Mean-
Insulation- Did You Know?
- Closed cell spray foam and has twice the R-value per inch of fiberglass or cellulose at r-7 per inch
- Access doors from conditioned spaces to unconditioned spaces (attics and crawl spaces) should be weatherstripped and insulated.
- In Maryland the recommended insulation level for most attics is R-49 or about 15-20 inches, depending on the insulation type.
- Sealing air leaks before adding your insulation will ensure that you get the best performance from your insulation.
Where to use and How much?
It should have a minimum of R-49 in the attic, which is equivalent to approximately 16″ of fiberglass insulation.
Fiberglass batts for standard 2×4 walls are available in low, medium, and high density products that range from R-11 to R-15. Whereas, Sprayed foam insulation in the same wall cavity can range from an R-14 to an R-28 depending on the product.
Depending on different circumstances such as – interference with moisture and proper ventilation – The United States Department of Energy recommends having insulation of R-25.
Of course for different types and brands of insulation used and how it was installed will vary. Here we have below the general comparisons from the Department of Energy:
Insulation Type : R-Value Per Inch
Fiberglass Batts – 2.9-3.8
Fiberglass Loose – 2.2-2.-
Cotton Batts – 3.0- 3.7
Cellulose Loose – 3.1-3.8
Polyurethane Foam – 5.6 – 8.0
Phenolic Foam – 4.4 – 8.2
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