145mm Isotherm Ceiling Insulation is South Africa’s premium soft-touch polyester ceiling insulation. With a declared R-value of 3.37 and an installed R-value of 3.77, this 145mm thick roll provides outstanding thermal and acoustic performance. Manufactured from 100% recycled PET fibres, it is completely itch-free, dust-free, non-allergenic and formaldehyde-free – making installation safer and more comfortable than glasswool. Each roll covers 6m² (5m x 1.2m) and offers excellent noise reduction plus self-extinguishing fire safety. Fully SANS 10400-XA compliant, it is ideal for new builds, retrofits and all South African climates, delivering major energy savings and year-round comfort.
Why 145mm Isotherm Ceiling Insulation Is the Comfortable Premium Choice for South African Homes
South African homeowners face extreme temperature swings, from scorching summers in Durban and Cape Town to freezing winters in Johannesburg and Pretoria. 145mm Isotherm Ceiling Insulation stands out as a high-performance, people-friendly solution that delivers excellent thermal resistance without the discomfort of traditional glasswool.
Made from 100% thermally bonded recycled polyester fibres, this soft-touch insulation achieves a declared R-value of 3.37 – one of the highest in the polyester range – while remaining completely itch-free, dust-free and non-allergenic. Its density of 11.5 kg/m³ ensures it stays resilient and effective for decades without sagging. Unlike glasswool products, 145mm Isotherm Ceiling Insulation is safer and more pleasant to handle, making it the preferred choice for DIYers and professional installers alike. It complies fully with SANS 10400-XA energy-efficiency regulations and provides a healthier indoor environment with zero added formaldehyde.
Exceptional Thermal Performance – R3.37 That Delivers Real Energy Savings
The 145mm Isotherm Ceiling Insulation achieves a laboratory-tested R-value of 3.37 m²·K/W, rising to an installed R-value of approximately 3.77 once correctly fitted. This high thermal resistance dramatically reduces heat transfer through the roof, the area responsible for up to 45% of unwanted heat gain or loss in typical homes.
With a thermal conductivity (K-value) of approximately 0.043 W/m·K and U-value of around 0.297 W/m²·K, the product performs exceptionally well across South Africa’s climatic zones. In colder inland areas like Johannesburg and Pretoria, it meets or exceeds the required added R-values under SANS 10400-XA. Homeowners consistently report cooler summers, warmer winters and electricity bill reductions of 30-40%. The polyester fibres also offer low moisture absorption (under 2%) and dry quickly if exposed to humidity, maintaining performance in coastal regions.
Low Acoustic Benefits
145mm Isotherm Ceiling Insulation provides low sound absorption thanks to its dense polyester fibre structure. It is not effective in reducing noise from heavy rain on metal roofs, traffic, aircraft and impact sounds from upper floors in double-storey homes.
The soft, flexible fibres trap sound energy efficiently. It is not going to cut heavy noise, etc. While polyester insulation offers slightly lower acoustic performance than high-density glasswool, the 145mm thickness still delivers impressive results that complement its thermal benefits perfectly.
Fire Safety and Compliance – Self-Extinguishing Protection
145mm Isotherm Ceiling Insulation carries the SANS 428 fire classification B/B1/2 and is self-extinguishing. It has nil flame spread, low smoke development and low toxicity, providing reliable fire safety for residential and light commercial applications. While it is classified as combustible, unlike the (A1) in Knauf Insulation, it meets all relevant South African building regulations when installed correctly and will not contribute to fire spread.
Key Benefits of Installing 145mm Isotherm Ceiling Insulation
- Superior Energy Savings: Cuts heating and cooling costs by up to 40%
- Year-Round Comfort: Maintains stable indoor temperatures in every climate zone
- Soft Touch & Itch-Free: 100% polyester – no fibreglass irritation during installation
- Non-Allergenic & Healthy: Dust-free, formaldehyde-free and odourless
- Eco-Friendly: Made from 100% recycled PET bottles
- Excellent Durability: Resilient fibres resist sagging for 50+ years
- Easy Installation: Lightweight, flexible rolls with 6m² coverage
- Moisture Resistant: Absorbs minimal water and dries quickly
- SANS Compliant: Fully meets SANS 10400-XA requirements
- Great Value: High performance at a competitive price point
These advantages make 145mm Isotherm Ceiling Insulation one of the most homeowner-friendly insulation options available.
Detailed Specifications Grid – 145mm Isotherm Ceiling Insulation
| Specification | Details |
|---|---|
| Thickness | 145 mm |
| R-Value (Declared) | 3.37 m²·K/W |
| Installed R-Value | ≈ 3.77 m²·K/W |
| Roll Dimensions | 5 m × 1.2 m |
| Coverage per Roll | 6 m² |
| Density | 11.5 kg/m³ |
| Thermal Conductivity (K-Value) | ≈ 0.043 W/m·K |
| U-Value | ≈ 0.297 W/m²·K |
| Material | 100% recycled polyester fibres |
| Fire Rating | B/B1/2 – Self-extinguishing (SANS 428) |
| Moisture Absorption | < 2% (dries quickly) |
| SANS Compliant | Yes (SANS 10400-XA) |
Simple and Safe Installation Guide for 145mm Isotherm Ceiling Insulation
Installing 145mm Isotherm Ceiling Insulation is quick and comfortable. The lightweight, flexible rolls fit easily between roof trusses or over brandering using standard fixing methods. No protective clothing beyond basic gloves and a dust mask is usually needed because the polyester fibres are soft and non-irritating. Simply unroll, cut to size and install snugly without compression for maximum performance. Professional installers complete an average home in just a few hours, and confident DIYers love the itch-free handling.
145mm Isotherm Ceiling Insulation vs 135mm Aerolite & Knauf – Honest Comparison
Homeowners often compare 145mm Isotherm Ceiling Insulation with the popular 135mm Aerolite Insulation options (Aerolite and Knauf).
Thermal Performance Comparison
All three products deliver very similar R-values (Isotherm 3.37 vs Aerolite/Knauf 3.38), so energy savings are comparable.
Handling and Comfort Comparison
145mm Isotherm Ceiling Insulation wins easily – it is completely itch-free and non-allergenic, while glasswool can be irritating during installation.
Fire Safety Comparison
Aerolite and Knauf offer superior A1 non-combustible ratings; Isotherm provides reliable B/B1/2 self-extinguishing performance.
Acoustic Performance Comparison
Glasswool (especially Knauf at NRC 1.13) edges ahead slightly, but Isotherm still delivers excellent noise reduction.
Eco Credentials Comparison
Isotherm stands out as 100% recycled polyester from PET bottles, while glasswool uses recycled glass but contains binders.
Which Should You Choose?
Choose 145mm Isotherm Ceiling Insulation for maximum comfort, easy handling, and a fully recycled product. Opt for Knauf or Aerolite if you prioritise the highest fire rating and slightly better acoustics. All three are excellent SANS-compliant choices.
Eco-Friendly Innovation Behind 145mm Isotherm Ceiling Insulation
145mm Isotherm Ceiling Insulation is manufactured from 100% recycled PET bottles, making it one of the greenest insulation options available. It is fully recyclable, contains no ozone-depleting substances, and helps lower your home’s carbon footprint through substantial energy savings. Its long lifespan means fewer replacements and less waste over time.
Real Homeowner Experiences with 145mm Isotherm Ceiling Insulation
South African families consistently praise 145mm Isotherm Ceiling Insulation for its soft handling, noticeable temperature improvements and quiet comfort without the itch or dust associated with glasswool. Many report faster installation and a healthier living environment.
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