Isotherm Polyester Ceiling Insulation
Thermally bonded polyester insulation manufactured from recycled PET. Isotherm is soft, non-allergenic and non-irritant, with six thickness options from 40mm to 145mm and thermal performance reaching R3.37. Isotherm does not currently carry SABS Mark approval.
Recycled PET.
Find the right Isotherm for your project
Compare Isotherm polyester insulation thicknesses by thermal R-value, insulation density, roll coverage and price to find the right option for your project. All six options are supplied in 1.2m-wide rolls.
145mm
Isotherm
135mm
Isotherm
100mm
Isotherm
75mm
Isotherm
50mm
Isotherm
40mm
Isotherm
Isotherm Polyester
Insulation
Isotherm is a thermally bonded polyester insulation range designed for ceilings, roofs, walls and partitions. Manufactured using recycled PET fibres, Isotherm is soft, lightweight, non-allergenic and non-irritant, making it comfortable to handle and install.
The Isotherm range is available in 40mm, 50mm, 75mm, 100mm, 135mm and 145mm thicknesses. These options provide different levels of thermal and acoustic performance for walls, roofs and insulation for ceilings . Compare the available thicknesses by R-value, roll coverage, acoustic performance and price to select the right product for your project.
Isotherm Prices & Cost Guide
Compare Isotherm polyester insulation prices across six available thicknesses, including roll coverage, R-values and approximate cost per m², to help you select the right option for your project and budget.
| Product | Coverage | R-Value | Roll Price | Approx. Cost / m² |
|---|---|---|---|---|
| 145mm Isotherm | 6m² | 3.37 | R699 | R116.50/m² |
| 135mm Isotherm | 6m² | 3.14 | R680 | R113.33/m² |
| 100mm Isotherm | 7.2m² | 1.57 | R599 | R83.19/m² |
| 75mm Isotherm | 9.6m² | 1.18 | R613 | R63.85/m² |
| 50mm Isotherm | 12m² | 0.79 | R516 | R43.00/m² |
| 40mm Isotherm | 12m² | 0.63 | R499 | R41.58/m² |
Price Per Roll
Roll prices vary by thickness because coverage and thermal performance differ across the range.
Cost Per m²
Cost per square metre provides a more useful comparison than looking at roll price alone.
Compare Six Thicknesses
Compare 40mm through to 145mm Isotherm by R-value, coverage and material cost.
Isotherm Supply & Professional Installation
Home Insulations supplies Isotherm polyester insulation for ceilings and provides professional installation for residential homes, insulation upgrades and selected commercial projects.
Whether you are insulating a new ceiling, upgrading an existing home or adding a top-up layer, we can assist with Isotherm product supply and professional installation.
- Residential homes
- Existing home retrofits
- Top-up insulation
- Selected commercial projects
Technical Specifications
Isotherm Product Specs
Select an Isotherm thickness below to compare its thermal R-value, density, roll coverage and technical specifications.
Isotherm 145mm – Technical Specifications
| Product | 145mm Isotherm |
|---|---|
| Product type | Insulation for Ceilings |
| Material | Polyester Insulation |
| Thickness | 145 mm |
| Roll length | 5.0 m |
| Roll width | 1200 mm |
| Coverage per roll | 6.00 m² |
| R-value | 3.37 m²·K/W |
| Density | 11.5 kg/m³ |
| Technical datasheet | View Manufacturer Datasheet |
| SABS approval | Not currently SABS approved |
| Fire classification | B/B1/2 |
| Applications | Roofs, ceilings, partitions and walls |
Need Isotherm Supplied or Installed?
Get an Isotherm polyester insulation quote today for supply or professional installation.