Rolled Attic Insulation Fiberglass Vs Cellulose

Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used.

Rolled attic insulation fiberglass vs cellulose.

Batt insulation take time to read this column. 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. 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. The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot.

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. If you have questions about blown in vs. You can get to the same place with either material. Fiberglass insulation and cellulose insulation offer similar r values.

Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation. Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot. Blown in insulation requires a professional.

Or 7 inches of cellulose. Before choosing blown vs. Batt insulation is available at home centers and lumberyards. Fiberglass insulation blown in attic r2 2 r4 3.

Blown in insulation often is a combination of loose fiberglass and treated cellulose fibers. 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. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Fiberglass batt or roll insulation r3 2. It s not uncommon for rolled fiberglass batts to peel away from the wall over time reducing the home s energy efficiency. One of the disadvantages to using fiberglass insulation however is its reduced lifespan. Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation.