Isotherm Insulation
Isotherm is a polyester ceiling insulation made from recycled PET bottles. It offers an itch-free installation experience, making it a good option for installers and homeowners who want to avoid the irritation commonly associated with glasswool.
What is Isotherm?
Isotherm is a polyester-based insulation manufactured from recycled plastic bottles. It contains no loose fibres, making installation more comfortable. However, it is not SABS approved and generally has a lower R-value, lower fire rating, and reduced acoustic performance compared to glasswool products like Aerolite or Knauf.
Which Thickness Should You Choose?
- 145mm Isotherm – Thickest option in the range, offering the best thermal performance.
- 135mm Isotherm – Popular all-round choice for standard residential ceilings.
- 100mm Isotherm – Suitable for moderate insulation requirements.
- 75mm Isotherm – Lighter options, often used as top-up layers.
- 50mm Isotherm – Lighter options, often used as top-up layers.
- 40mm Isotherm – Thinnest option, best where space is limited.
Why Choose Isotherm?
- Itch-free and easy to handle during installation
- Made from recycled PET bottles
- No loose fibres
- Maintains its loft over time
Compare Isotherm to Other Products
Isotherm is a polyester insulation that prioritises ease of installation and comfort. To understand how it compares to other materials and brands, explore the comparisons below covering performance, cost, fire safety, and installation comfort.
- Compare Isotherm vs Aerolite
- Compare Isotherm vs Knauf
Shop Isotherm Insulation
Select the thickness you require for your project and let Insulation Warehouse handle the rest with quick, dependable delivery throughout Johannesburg, Centurion and Pretoria.
Where to Go Next
- Return to the Insulation Overview → Insulation
- Explore insulation by brand → Brands
- Learn about polyester insulation → Polyester
- Compare ceiling insulation options → Ceiling Insulation