Polyester Insulation

What Is Polyester Insulation?

Polyester insulation is manufactured largely from recycled PET plastic, the same polyethylene terephthalate fibre used in clothing and bedding, much of which is sourced from drink bottles that would otherwise end up in land fill. The fibres are bonded together using heat rather than chemical binders, giving the finished batt a rigid yet flexible structure that holds its shape without shedding, off-gassing, or requiring added formaldehyde.

Because it contains no breathable particles and no dusty fibres, polyester insulation is naturally soft to handle. Most installers can fit it without gloves, a mask, or any specialised protective clothing, which is a genuine point of difference from older mineral-fibre products.

Asthma Friendly and Low Allergen

As polyester insulation contains no breathable particles, it's a genuine option for households where asthma or severe dust allergies are a concern. Polyester insulation batts are recommended by the Asthma Foundations Australia for use in low allergen and asthma-friendly buildings, and the material's non-irritant, non-toxic, and non-allergenic properties mean it produces no itching or scratching during handling or once installed.

Fire Safety, Moisture and Durability

Polyester insulation carries a low fire risk rating and, rather than burning, will only melt when exposed to open flame, helping to curb the spread of fire while remaining compliant with Australian building codes. It's also naturally hydrophobic, meaning it dries quickly, resists water, and is largely unaffected by moisture, mould, mildew, or rot — a genuine advantage over insulation types that lose performance once damp.

Backed by long product durability warranties from leading manufacturers, polyester insulation is designed to hold its thermal and acoustic performance for the life of the building, resisting vermin and insect attack along the way.

Key Benefits

• Low allergen and itch-free — safe to handle without protective clothing, and a genuine option for allergy and asthma sufferers
• No Volatile Organic Compounds or formaldehyde — supports healthier indoor air quality
• Naturally hydrophobic — resists moisture, mould, and mildew rather than absorbing it
• Not flammable — low fire risk rating and compliant with Australian building codes
• Made from recycled material — reduces landfill impact and is itself recyclable at end of life
• Strong thermal and acoustic performance — reduces heat transfer and helps soundproof rooms against outside noise
• Long service life — thermally bonded to resist deterioration, sagging, or settling over time

Types of Polyester Insulation We Stock

• Ceiling batts — pre-cut segments measured to fit standard timber-framed ceilings
• Wall batts — sized for standard stud cavities across internal and external walls
• Underfloor insulation rolls and batts — for continuous joist runs or pre-cut segments beneath timber floors
• Acoustic insulation batts and panels — denser polyester products built specifically to reduce noise transfer between rooms

Installation Tips

Polyester batts are thermally bonded into shape, designed to be self-supporting, and require no stapling to stay in place. They can be easily torn across the width by hand for smaller adjustments around obstacles, and any off-cuts can be reused in smaller areas rather than wasted. It's important not to compress polyester insulation during installation, since compression reduces the trapped air responsible for its R-value rating and can compromise overall performance.

Polyester vs Glasswool Insulation

Polyester insulation batts are generally more expensive than glasswool, but the difference comes down to what each household values most. Glasswool remains the more budget-friendly, widely available default for standard residential jobs. Polyester earns its higher price where allergy-friendly handling, moisture resistance, and itch-free installation are genuine priorities, particularly in bedrooms, nurseries, and homes with asthma-sensitive occupants.

Brands We Stock

We carry polyester insulation from trusted manufacturers including Bradford Polymax, Polyester Solutions, and other leading suppliers, alongside comparable glasswool options from Knauf Earthwool, Fletcher Insulation, and James Hardie for households weighing up both material types.

Shop Our Polyester Insulation Range

Browse our full range of polyester insulation batts and rolls below, or get in touch with our team for help selecting the right R-value and product for your ceiling, wall, or underfloor project.