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Spray Foam vs. Fiberglass

Do you need more insulation for your attic, walls or somewhere else in your home? You have a number of different options. Perhaps you’re doing research on fiberglass and spray foam, two widely installed types of insulation.

Learn the qualities of spray foam insulation vs. fiberglass so you can make an informed decision for your home.

Fiberglass Insulation

In the debate of spray foam insulation vs. fiberglass, people tend to be more familiar with the latter. Fiberglass, which is comprised of extremely fine glass fibers, is commonly found in two forms: batts and loose-fill. Medium-density batts provide an R-value of just over R-3 per inch. They come in standard sizes to fit between ceiling, wall and floor joists built to code.

Loose-fill fiberglass is made of molten glass spun into fibers. Most manufacturers use 20 to 30 percent recycled glass for a more environmentally friendly insulation material. While loose-fill requires a special blowing machine to apply the insulation, it can be worthwhile to fill oddly shaped areas not ideal for batts. Loose-fill offers R-2.2 to R-2.7 per inch. Fiberglass is also:

  • Inorganic
  • Resistant to water absorption
  • A good sound absorber

Spray Foam Insulation

This material is made of polyurethane in either a closed-cell or open-cell formula. Closed-cell spray foam is filled with a low-conductivity, non-HCFC (hydrochlorofluorocarbon) gas to help the material expand and fill the space around it. This type of spray foam reaches R-values of R-5.5 to R-6.5 per inch. Open-cell spray foam is spongier and less dense and achieves about R-3.6 per inch.

Spray foam expands to seal and fill the cavity completely. This makes spray foam ideal for areas with an irregular shape or obstructions (pipes, wiring, etc.) passing through them. Spray foam is also:

  • Flexible
  • Permeable to water vapor so your home can breathe
  • Ideal for irregularly shaped locations

Both spray foam and fiberglass are viable insulation materials, but we recommend fiberglass over spray foam. For a free estimate on your project, contact OJ Insulation today!

Where should you insulate in your home? Check out our interactive infographic:

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