Rolled Attic Insulation Fiberglass Vs Cellulose

Assuming your current attic insulation is made from fiberglass and has a value of r 13 you d have to add roughly 10 inches of additional fiberglass to hit r 38. Thankfully this isn t a problem with blown cellulose insulation since it remains in place. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

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Or 7 inches of cellulose.

Rolled attic insulation fiberglass vs cellulose.

Fiberglass insulation and cellulose insulation offer similar r values. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Blown in insulation often is a combination of loose fiberglass and treated cellulose fibers. It s not uncommon for rolled fiberglass batts to peel away from the wall over time reducing the home s energy efficiency.

When comparing blown in insulation both fiberglass and cellulose are nearly identical in price both costing around 0 70 to 0 80 per square foot for 6 inches of insulation. Batt insulation take time to read this column. Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation. Fiberglass batt or roll insulation r3 2.

Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot. The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. Batt insulation or about insulation removal and or installation for your home or building we re here to help.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. One of the disadvantages to using fiberglass insulation however is its reduced lifespan. Batt insulation is available at home centers and lumberyards. Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation.

Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. With blown in insulation you can expect an r value of 2 2 to 2 7 per inch for fiberglass and between 3 2 and 3 8 per inch of cellulose. If you have questions about blown in vs. Fiberglass insulation blown in attic r2 2 r4 3.

Before choosing blown vs. Both cellulose and fiberglass insulation provide about the same level of insulating power or r value per inch with slightly different results based on the installation procedure. Blown in insulation requires a professional. You can get to the same place with either material.

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