How does spray-foam compare with fiberglass batts ?
• Fiberglass batts will not stop air leakage. Blown-in cellulose will slow down air leakage. Spray-foam will STOP air leakage. Spray-foam is also mold & moisture resistant unlike fiberglass & cellulose. • Fiberglass batts have an R-value of about 3.5 per inch. However, this is not a true R-value since there is no air seal. Blown-in cellulose has an R-value of about 3 to 4 per inches) but also no air seal. Our spray-foam has a true R-value of 3.8 – 6.8 depending on the density foam we use (1-inch thickness). • Fiberglass batts can sag over time; blown-in cellulose can settle over time leaving sections of the stud cavity uninsulated. Spray-foam completely adheres to the wood studs and sheathing resulting in a permanent sealed barrier against air penetration and leakage. • Spray-foam will add strength and rigidity to your house.
1. Fiberglass batts will not stop air leakage (they might filter out some dirt and dust). Spray-foam will stop air leakage . . . dead. Spray-foam is also mold & moisture resistant unlike fiberglass. 2. Fiberglass batts have an R-value of about 3.5 per inch but this is not a true R-value since there is no air seal. Our spray-foam has a true R-value of 3.9-7 per inch depending on the density foam we use. Our cellulose product also seals gaps & has an R-value of 3.7 per inch. 3. Fiberglass batts can sag & shrink over time; this leaves sections uninsulated and you’ll feel warmer or colder because of it. Spray-foam completely adheres to wood and sheathing; the result is a permanent barrier to heat loss and air entry. 4. Spray-foam will add strength and rigidity to your house. Fiberglass batts will not.
