Definition
Insulation types include fiberglass batts, blown cellulose, spray foam, and rigid foam boards—each with different R-values per inch, costs, and installation requirements. Proper installation without gaps is critical for performance.
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Fiberglass batts are affordable and common in walls and ceilings. Blown cellulose is eco-friendly and good for retrofits. Spray foam provides superior air sealing and insulation but is more expensive. Rigid foam boards are used on basement walls and outside sheathing. Each material has different R-value per inch, cost, moisture sensitivity, and installation requirements. Proper insulation installation (no gaps, proper density) is critical for performance.
Pro Tip
Spray foam is premium but delivers superior air sealing. Use selectively in critical areas like band joists.
Example
A home uses spray foam in walls for superior air sealing, fiberglass in cavities, and blown cellulose in attic for cost-effective coverage.