Short Answer
Blown-in fiberglass insulation typically lasts 20–30 years or more with no loss of R-value. Unlike cellulose, fiberglass does not settle significantly over time, does not absorb moisture, and does not degrade. It's a one-time investment that performs for decades.
Detailed Explanation
Owens Corning blown-in fiberglass insulation is one of the most durable insulation materials available. Unlike cellulose insulation (which can settle and lose 15–20% of its R-value over time), Owens Corning fiberglass is manufactured from spun glass fibers that do not compact or settle under their own weight. This means the R-value you install today is the R-value you'll have in 20 years. Owens Corning fiberglass is also non-combustible, non-corrosive, and does not absorb moisture — if it gets wet, it dries out and retains its insulating properties, unlike cellulose which can clump and lose effectiveness when wet. The primary reasons insulation might need attention over time are: disturbance — if someone moves or compresses the insulation (during maintenance, electrical work, etc.), it should be re-fluffed or supplemented; contamination — if the attic has pest activity or water damage from a roof leak, affected insulation may need replacement; or code changes — if DOE recommendations increase, you may choose to add more. But under normal conditions, Owens Corning blown-in fiberglass insulation installed to R-49 or higher will perform effectively for the life of the home. This is why it's a smart investment — the one-time cost delivers decades of energy savings and comfort.
Why It Matters
Knowing that insulation is a long-lasting investment helps homeowners understand the value. Unlike HVAC equipment or roofs that need replacement every 15–20 years, insulation is a one-time upgrade that keeps paying off.
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