Cost: Down feathers are a relatively expensive insulating material compared to other options like fiberglass, cellulose, or spray foam. The cost of down feathers alone can make them impractical for insulating large areas such as attics.
Moisture Retention: Down feathers have a tendency to absorb and retain moisture from the air, which can lead to problems with condensation and mold growth in the attic. This can compromise the effectiveness of the insulation and cause damage to the attic structure over time.
Fire Resistance: Down feathers are organic and highly flammable. In case of a fire, they can easily catch fire and contribute to the spread of flames, posing a safety hazard.
Durability: Down feathers are susceptible to degradation and breakdown over time. They can become compressed and lose their insulating properties, requiring frequent replacement.
Environmental Impact: The sourcing of down feathers for insulation can have environmental implications. Obtaining feathers involves raising large numbers of waterfowl, which can contribute to water pollution, habitat disruption, and animal welfare concerns.
For these reasons, synthetic materials like fiberglass and cellulose are more commonly used as attic insulation. They are more affordable, moisture-resistant, fire-resistant, durable, and environmentally friendly compared to down feathers.