Fiberglass vs. Spray Foam

Blown In Fiberglass vs Spray Foam Insulation

Blown-in fiberglass insulation and spray foam insulation are two popular types of insulation with distinct characteristics.

Blown-in fiberglass insulation consists of fiberglass particles that are blown into the designated area using specialized equipment. It conforms to various shapes and sizes and is ideal for spaces where other insulation types would be difficult to install. Blown-in fiberglass insulation is typically less expensive than spray foam insulation and provides excellent soundproofing.

In contrast, spray foam insulation is created by mixing two chemicals, which react and create foam that hardens and fills gaps and cracks. It is highly effective at sealing and insulating spaces, providing an airtight and moisture-resistant barrier. Spray foam insulation is ideal for areas prone to air leaks and moisture, such as basements and crawl spaces.

Overall, both have their advantages and disadvantages. Blown-in fiberglass is affordable and suitable for hard-to-reach areas, but may not provide as much sealing as spray foam. Spray foam is more expensive but provides an airtight and moisture-resistant barrier. The best choice for a particular project depends on factors such as the location, budget, and specific insulation requirements.

Close-up of wooden frame for future walls and ceiling insulated with rock wool and fiberglass
Worker doing spray foam insulation on the walls

How much Insulation do I need?

Insulation is measured in R-values. the higher the R-value, the better your walls and roof will resist the transfer of heat. The U.S. Department of Energy (DOE) recommends ranges of R-values based on local heating and cooling costs and climate conditions in different areas of the nation. The map and chart below show the DOE recommendations for how insulation in Georgia works. State and local codes in some parts of the country may require lower R-values than the DOE recommendations, which are based on cost effectiveness.

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