135mm Isotherm Polyester Ceiling Insulation Roll
In stock
R680.00
The 135mm Isotherm Insulation offers reliable thermal performance with an R-value of 3.14 m²·K/W.
- Thickness: 135mm
- Coverage: 6m²
- Length: 5,000mm
- Width: 1,200mm
- R-value: 3.14
- Installed R-value: 3.54
- Density: 11.5 kg/m³
For more information, Contact Us
135mm Isotherm Insulation
The 135mm Isotherm is a polyester ceiling insulation made from recycled PET plastic bottles. Designed for South African climatic zones 2 and 6, it offers reliable thermal performance, a softer handling experience, and eco-friendly credentials.
With a product R-value of 3.14 m²·K/W and a typical installed R-value of 3.54 m²·K/W, it helps keep homes warmer in winter and cooler in summer, while also assisting in reducing energy usage. Its non-allergenic, dust-free composition makes it safe to install without gloves, masks, or overalls.
Compliance Notice
Isotherm insulation is no longer SABS-approved. The product did not meet the updated South African Bureau of Standards criteria, resulting in the loss of certification.
Where SABS approval is mandatory—such as for public sector projects, schools, or medical facilities—alternative products like Knauf or Aerolite are recommended, as these retain full SABS compliance.
135mm Isotherm Specifications
| Specification | Details |
|---|---|
| Thickness | 135mm |
| Width | 1,200mm |
| Length per Roll | 5,000mm |
| Coverage per Roll | 6m² |
| Density | 11.5 kg/m³ |
| R-Value | ~ 3.14 m²·K/W |
| Installed R-Value | ~ 3.54 m²·K/W* |
| NRC | ≥ 0.75 |
| Fire Classification | B/B1/2 (B-class) |
| Compliance | SANS 10400-XA compliant; ISO 9001 / 14001 certified |
| Material | 100% polyester from recycled PET bottles |
| Vapour Resistivity | Low – allows roof space ventilation |
Benefits of 135mm Isotherm
- Solid thermal efficiency – R-value of 3.14 provides dependable performance in Zones 2 & 6.
- Installer-friendly – soft texture with no itch or loose fibers.
- Basic noise reduction – NRC ≥ 0.75 offers some improvement in reducing sound transfer.
- Environmentally responsible – made from recycled bottles and fully recyclable at end-of-life.
- Durable performance – resists decay, moisture damage, and pest infestation.
Installation Insights
- Well-suited for both new builds and retrofit applications where a mid-to-high R-value is needed.
- Can be installed as a single layer or over existing insulation to boost performance.
- Lightweight rolls make it easy to handle in tight ceiling spaces.
- No mandatory PPE required, although gloves and a dust mask are advisable in dusty roof voids.
Where 135mm Isotherm Works Best
- Inland Zone 2 locations such as parts of Johannesburg and Pretoria, where a strong thermal barrier is beneficial year-round.
- Zone 6 areas with cooler winters, helping maintain indoor warmth and reduce heating costs.
- Residential roof spaces where a balance between thermal comfort, eco-credentials, and installation ease is important.
Related Isotherm Options
- 145mm – highest performance for Zones 1 & 4.
- 135mm – optimal for Zones 2 & 6.
- 100mm – meets compliance for Zones 3 & 5.
- 75mm – typically used for top-up layers or targeted retrofits.
- 50mm – typically used for top-up layers or targeted retrofits.
- 40mm – typically used for top-up layers or targeted retrofits.
Upgrade Your Home’s Comfort
We supply and install 135mm Isotherm insulation in Johannesburg, Centurion, and Pretoria. Contact us for expert advice, fast delivery, and professional installation to make your home more comfortable and energy-efficient all year round.
Delivery Information
At Home Insulations, we take pride in delivering high-quality insulation products, including XPS ceilings and various insulation materials, directly to your doorstep. To ensure that your order is delivered efficiently and safely, we have the following guidelines in place:
1. Delivery Process for Insulation Products
- For insulation products, we deliver stock orders within 3 to 5 days from the time of payment. This ensures quick and efficient delivery to meet your project timelines.
- There is a minimum order of 5 rolls required for product delivery. Please ensure your order meets this minimum quantity to arrange delivery.
- Delivery is charged separately and based on your distance (km) from us.
2. Delivery Process for XPS Boards
- XPS ceiling boards are delivered via large truck to ensure safe and secure transport. Our team is equipped to handle deliveries to locations in Johannesburg, Pretoria, Centurion, Durban, and Cape Town.
- Please note, XPS boards are cut to order, meaning we do not keep stock of pre-cut boards. Each order is processed and custom-cut based on your specific requirements, ensuring you receive the right size and thickness for your project.
- To guarantee delivery for the following week, all payments must be received by Thursday of the current week. This allows us enough time to prepare your order and schedule the delivery.
- Delivery is charged separately and based on your distance (km) from us.
Please note: that all ceiling boards are cut to order based on your specific requirements. As a result, we are unable to accept returns or offer refunds for products once they have been cut. We highly encourage you to double-check your measurements and specifications before placing your order to ensure the items are exactly what you need. If you have any questions or concerns about your order before it's processed, feel free to contact us, and we’ll be happy to assist you. Thank you for your understanding.
Delivery Locations
- We deliver to areas across South Africa, including Johannesburg, Pretoria, Centurion, Durban, and Cape Town. If you're outside these areas, please contact us for specific delivery arrangements.
If you have any questions or need assistance with your delivery, please don’t hesitate to reach out to our customer service team.
How To Order?
- Visit our online shop for insulation prices and stock availability.
- Add your product and quantity of rolls to the cart.
- Fill out your delivery address and contact details.
- We will email you the invoice after the order has been placed.
- Once we have received your payment we arrange delivery
Business Hours
- MON: 8:00AM - 4.00PM
- TUE: 8.00AM - 4.00PM
- WED: 8.00AM - 4.00PM
- THU: 8.00AM - 4.00PM
- FRI: 8.00AM - 4.00PM
- SAT: CLOSED
- SUN: CLOSED
For more information Contact Us
