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What is the difference between fiberglass and polyester insulation batts?

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Polyester insulation batts and fiberglass batts are both types of insulation materials used to improve energy efficiency and reduce heating and cooling costs in residential and commercial buildings. However, there are some key differences between the two.

  • Material: Polyester batts are made from polyester fibers, while fiberglass batts are made from fine fibers of glass.
  • Durability: Polyester batts are more resistant to moisture, mold, and mildew compared to fiberglass insulation batts. Fiberglass batts are non-flammable and do not absorb moisture, which makes them resistant to mold and mildew.
  • Irritation: Fiberglass batts can cause itching and irritation to the skin and eyes when they are handled. Polyester batts are non-irritant and do not contain any harmful chemicals.
  • Recycling: Polyester batts are made from recycled materials and are also recyclable after their useful life. Fiberglass batts can’t be recycled.
  • Cost: Fiberglass batts are typically more affordable than polyester insulation batts.
  • Thermal Performance: Both polyester and fiberglass batts have a high R-value, which measures their ability to resist heat flow, and both can effectively keep buildings warm in the winter and cool in the summer.

In summary, polyester batts are more durable, environmentally friendly, and safer to handle, but more expensive than fiberglass batts. Fiberglass batts are more affordable but can cause irritation and are not very environmentally friendly. Both types of insulation have good thermal performance and can effectively improve energy efficiency. The choice between them will depend on the specific needs of the building and the priorities of the homeowner or building owner. 

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