Quick Answer
Blown-in cellulose and spray foam insulation share similar insulation performance but differ in installation method, cost, and environmental impact. Cellulose is generally cheaper and more eco-friendly, while spray foam offers better air sealing and durability.
Installation and Cost Comparison
Blown-in cellulose insulation is typically installed through a network of holes drilled in the walls, allowing for a more labor-intensive process. The material is then blown into the space using a specialized machine. This method can be more cost-effective, with prices ranging from $0.50 to $1.50 per square foot, depending on the location and labor costs. In contrast, spray foam insulation is installed using a specialized gun, which can be faster and more efficient. However, the cost is typically higher, ranging from $1 to $3 per square foot.
Performance and Durability
Both cellulose and spray foam insulation offer similar R-values, with cellulose typically ranging from R-3.5 to R-4 per inch and spray foam ranging from R-6 to R-7 per inch. However, spray foam offers better air sealing due to its ability to fill gaps and crevices. This makes it a better option for areas with high humidity or air leakage. Cellulose, on the other hand, is more prone to settling and may require additional support to maintain its R-value over time.
Environmental Impact and Fire Resistance
Cellulose insulation is considered a more eco-friendly option due to its natural composition and recyclable materials. It also meets the minimum fire-resistance standards set by the International Building Code (IBC). Spray foam insulation, while also meeting fire-resistance standards, contains chemicals like isocyanates, which can be hazardous to human health. However, many spray foam products are now available with reduced chemical content, making them a safer option.
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