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Both can work well when properly installed. Fiberglass is generally lighter and experiences little settling. Cellulose uses recycled paper fibers and is installed with an allowance for expected settling. The right choice depends on available space, existing insulation, target performance, and budget.

R-value measures insulation’s resistance to heat flow. The right target depends on your existing insulation, attic design, local requirements, and project goals. We recommend the insulation level and installation depth for your home using the selected product’s specifications.

 Phoenix Metro is in Climate Zone 2B. ENERGY STAR currently lists R-49 for an uninsulated attic in Climate Zone 2. An existing attic needs an assessment of its current insulation and an appropriate upgrade plan. We distinguish the R-value being added from the finished total and consider applicable local requirements.

Often, yes. Existing insulation can usually remain when it is dry, in suitable condition, and appropriate for the planned installation. Moisture problems, damaged material, or contamination should be evaluated and addressed before adding more insulation.

It can help reduce heating and cooling energy use when your attic is under insulated by up to 30%. Actual savings depend on the starting insulation level, air leakage, ductwork, HVAC condition, thermostat settings, and weather.

Fiberglass and cellulose insulation do not replace dedicated air sealing. Openings between the attic and living space should be evaluated and sealed where needed before insulation is added. Any additional air-sealing work should be identified in your project scope.

Our listed blown-in fiberglass options range from $1.75 to $2.25 per square foot, depending on the R-value specification selected. The total estimate also depends on attic size, access, existing conditions, and the work required. Cellulose insulation is quoted separately.

A vented attic needs appropriate ventilation even when it is well insulated. Insulation slows heat transfer through the ceiling, while ventilation provides airflow through the attic. Soffit intake openings should remain clear. A sealed or conditioned attic requires a different design.