Isotherm Polyester Insulation
40mm Isotherm Polyester Insulation
40mm Isotherm is a soft polyester insulation roll made from recycled PET fibres. It has a product R-value of 0.63, covers 12m² per roll and is suited to topping up existing insulation or insulating internal spaces.
R-Value
resistance (R-value)
Product Overview
40mm Isotherm is a polyester insulation roll manufactured from recycled PET fibres. Its product R-value is 0.63m²·K/W. It is mainly suited to topping up existing insulation, internal partitions and other lighter-duty thermal applications.
The roll measures 1.2m × 10.0m and covers 12m². It has a nominal density of 8.5kg/m³ and is soft and non-irritant to handle.
Key Benefits
- ✓R0.63 product thermal resistance
- ✓12m² coverage per roll
- ✓Manufactured from recycled PET
- ✓Soft and non-irritant to handle
- ✓B/B1/2 fire classification
- ✓8.5kg/m³ nominal density
- ✓Useful as a top-up layer
- ✓Flexible and easy to cut to fit
Typical Application
Commonly used to supplement existing insulation or in selected internal wall and between-floor applications.
Technical Product Data
40mm Isotherm Technical Specifications
Dimensions, material composition, thermal performance and fire classification for the 40mm Isotherm polyester insulation roll.
| Brand | Isotherm |
|---|---|
| Product type | Insulation for Ceilings |
| Material | Polyester Insulation |
| Thickness | 40mm |
| Nominal roll size | 1.2m (W) × 10.0m (L) |
| Coverage per roll | 12m² |
| Product R-value | 0.63m²·K/W |
| Total installed R-value | Depends on the complete roof and ceiling assembly |
| Nominal density | 8.5kg/m³ |
| Material composition | Thermally bonded recycled PET polyester |
| Moisture absorption | <2% |
| Fire classification | B/B1/2 polyester classification |
| SABS approved | No |
| Handling | Soft, non-irritant and free from loose glass fibres |
| Applications | Top-up layers, internal partitions and selected between-floor applications |
Insulation Applications
Where Can 40mm Isotherm Be Used?
This thinner roll is suited to topping up existing insulation and selected internal applications. Check the required thermal performance before using it as the only insulation layer above a ceiling.
Insulation Top-Ups
Add a light layer over suitable existing insulation without compressing either layer.
View Insulation for Ceilings →
Between Floors
A soft polyester layer for selected between-floor cavities and basic acoustic comfort.
View Soundproofing →
Internal Walls
Flexible insulation for suitable internal partition and wall systems.
View Wall Insulation →Professional Installation
Installing 40mm Isotherm
Install the blanket without compression or gaps so it retains its intended thickness.
Need Professional Installation?
Home Insulations supplies and professionally installs Isotherm polyester insulation in our Gauteng service areas.
Installation ServicesProduct Documentation
Isotherm Product Brochure
View the Isotherm manufacturer brochure for product dimensions, thermal information, thickness options and applications.
Isotherm Insulation Brochure
Product information for the Isotherm polyester insulation range.
40mm Isotherm Information
Frequently Asked Questions
The product R-value shown for this 40mm roll is 0.63m²·K/W. The total installed R-value depends on the complete assembly.
One roll measures 1.2m wide by 10.0m long and covers 12m².
Isotherm is thermally bonded polyester manufactured from recycled PET fibres.
The Isotherm product information lists a B/B1/2 polyester fire classification.
No. Isotherm does not currently carry SABS approval.
Its R0.63 product value provides a light thermal layer. Check the required total R-value for the project before using it alone.
Need 40mm Isotherm Supplied or Installed?
Get help calculating quantities, confirming current pricing or arranging professional installation.