Insulation

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Fiberglass Blanket Insulation

Manufacturers now produce medium and high-density fiberglass batt insulation products that have slightly higher R-values than previous varieties. The denser products are intended for insulating areas with limited cavity space, such as cathedral ceilings.

*High-density fiberglass batts for a 2 x 4 inch stud-framed wall has an R-15 value, compared to R-11 for "low density" types. A medium-density batt offers R-13 for the same space. High-density batts for a 2 x 6 inch frame wall offer R-21. High-density batts for 8.5 inch spaces offer about an R-30 value. R-38 for 12 inch spaces is also available.

Loose-Fill Cellulose Insulation

Celloluse -- a material used as loose-fill insulation -- is made from recycled wood fiber, primarily newsprint. The wood fiber is shredded and pulverized into small, fibrous particles that pack tightly into closed building cavities, inhibiting airflow. This provides a thermal resistance of R-3.6 to R-3.8 per inch. *

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Spray-Foam Polyurethane

Polyurethane is a closed-cell foam insulation material that contains a low-conductivity gas (usually hydrochlorofluorocarbons or HCFC) in its cells. The high thermal resistance of the gas gives polyurethane insulation materials an R-value typically around R-7 to R-8 per inch. Sprayed or foamed-installing foam boards. These applications also usually perform better since the liquid foam molds itself to all of the surfaces. These foams have an aged R-6.5 per inch thickness.*

* Source: US Department of Energy†

 

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