Which attribute is a sustainability advantage of cellulose insulation?

• A. Recycled content
• B. Higher embodied energy
• C. Poorer airtightness
• D. Requires more energy to produce than foam

Answer: (A)

Cellulose insulation stands out for sustainability because it is largely made from recycled paper. This means a high portion of the material is post-consumer or post-industrial waste that’s repurposed into insulation rather than pulled from virgin resources. Using recycled content reduces the demand for virgin fibers and helps divert waste from landfills, lowering the environmental footprint. Production energy for cellulose is typically lower than that of foam insulations, and when installed properly, it fills cavities well and supports a tight building envelope, further boosting energy efficiency. The other options describe traits that aren’t aligned with cellulose’s typical environmental advantages—higher embodied energy, poorer airtightness, or more energy to produce than foam—so the recycled content is the key sustainability edge.