Spray Foam Insulation vs Fiberglass: An Honest Comparison
Both products insulate, but they don't perform the same. Here's a side-by-side covering R-value, air sealing, moisture, longevity, cost, and where each one makes sense.
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Spray foam insulation in both commercial and residential construction offers both immediate and long term benefits that far outweigh the cost of initial installation.
It can lower your heating and cooling costs by up to 50%, reduce the chance of mold growth, discourage infestation of household pests, improve air quality and protect against respiratory problems by reducing allergens, pollutants, and pollen. Spray foam insulation will also increase the resale value of your home, and even reduce external noise pollution.
Significantly lowers heating & cooling costs so you can install smaller, more energy efficient HVAC equipment.
Helps prevent airborne moisture across the building envelope, one of the main causes of mold growth.
Zero food value for rodents and insects — discourages infestation of household pests.
Protects against respiratory problems by reducing allergens, pollutants, and pollen from entering your home.
Spray foam insulation increases the resale value of your home — a lasting investment in comfort and efficiency.
Reduces indoor noise pollution and external sound transmission for a quieter, more peaceful home.
Most builders that we work with today tell us that they continue to use foam because they have seen it makes a difference. They know the value that it adds to a structure, and the comfort and savings it will provide for years to come. Fiberglass simply cannot match the air-sealing, moisture-resisting, and thermal performance of spray foam.
Talk to an ExpertExpands to fill every gap — creates a continuous air barrier
Leaves gaps and voids — air flows freely through
Won’t settle or sag over time — permanent installation
Settles and sags over time — loses R-value as it ages
Moisture resistant — helps prevent mold growth
Absorbs moisture — promotes mold and mildew
Liquid Green spray foam insulation: Is ultra light weight… Has superior thermal properties… Has excellent acoustical properties… Insulates and seals in just one application… Reduces indoor noise pollution… Stays firmly in place & won't settle or sag over time… Significantly lowers heating & cooling costs… Lowers free floating allergens… Stops drafts & cold spots… Since your insulation is 50% more energy efficient, install smaller, more energy efficient HVAC equipment… So you're not only saving money, you're helping save our planet too
Beyond insulation, Liquid Green offers protective coating solutions that create a seamless, moisture-resistant barrier. Our coating products work hand in hand with our spray foam insulation to deliver complete building envelope protection for both residential and commercial properties.
Common questions about why Liquid Green spray foam outperforms conventional insulation.
Yes. Spray foam outperforms fiberglass on every important measure: it seals air leaks (fiberglass doesn't), it doesn't settle or sag over time, it has higher R-value per inch, and it acts as both insulation and air barrier in one application.
Yes. Liquid Green spray foam far exceeds cellulose in moisture resistance, doesn't provide a food source for pests, and won't settle. Cellulose can lose R-value as it compacts over the years; spray foam does not.
Yes. Spray foam significantly reduces indoor noise pollution. Open cell spray foam is particularly effective at sound dampening, making it a great choice for interior walls, media rooms, and bedrooms near noisy areas.
Yes. Because spray foam insulates and seals in one application, it stops drafts, cold spots, and air leakage — the main causes of energy waste. Many homeowners see heating and cooling costs drop by up to 50% after installation.
Yes. Once cured (within 24 hours), Liquid Green spray foam is inert and safe. It does not off-gas, supports healthier indoor air quality, and helps lower free-floating allergens by sealing the building envelope against outdoor pollutants.
No. Properly installed spray foam is a permanent insulation solution. It does not settle, sag, compress, or lose R-value over time, which is one of the key advantages over fiberglass and cellulose.
Honest comparisons to other insulation, what R-value really means in the field, and the safety record of modern spray foam.
Both products insulate, but they don't perform the same. Here's a side-by-side covering R-value, air sealing, moisture, longevity, cost, and where each one makes sense.
Read the Article
R-value is the most quoted number in insulation — and the most misunderstood. Here's what it actually means for spray foam, and where the headline number can fool you.
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Once cured, modern spray foam is inert. Here's an honest safety overview covering fire ratings, off-gassing, indoor air quality, and what to ask your installer.
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