isotherm insulation prices for home in south africa

Isotherm Insulation (145mm / 135mm / 100mm / 75mm / 50mm / 40mm)

R356.00 – R652.00

Upgrade your home with Isotherm Insulation, a polyester (PET) insulation solution made from 100% recycled plastic bottles. Soft to the touch and certified non-irritant, Isotherm offers a healthier, eco-friendly alternative to traditional insulation. Its delivers year-round comfort, reduced energy bills, and a safer indoor environment—all finished with a clean, formaldehyde-free binder.

Isotherm Thickness

Clear

Description

Isotherm Insulation For South African Homes

Q: Why is Isotherm no longer SABS approved?

Isotherm voluntarily withdrew SABS certification; while still safe and compliant with SANS standards, it no longer holds the SABS stamp.

Q: Is Isotherm fireproof?

Isotherm carries a B/B1/2 fire rating, making it non-combustible under normal residential conditions.

Q: How effective is Isotherm?

Isotherm delivers strong thermal and acoustic performance depending on thickness, offering year-round energy savings.

Q: What is Isotherm insulation made of?

Isotherm is made entirely from 100% recycled PET plastic bottles and is fully recyclable.

Q: What other insulation products should I consider?

Other polyester options include Fabufill; glasswool alternatives include Knauf and Aerolite.

Isotherm insulation is one of South Africa’s polyester insulation products, offering a soft, eco-conscious, and maintenance-free solution for homes and buildings. Made from 100% recycled PET plastic bottles, Isotherm is non-toxic, non-irritant, and safe to handle without protective gear.

Whether you’re upgrading old ceiling insulation or working on a new residential project, Isotherm provides year-round comfort and energy savings with minimal environmental impact.

At Home Insulations, we supply and install Isotherm insulation across Johannesburg, Pretoria, Centurion, Cape Town, and Durban, with reliable delivery and professional installation services.

Calculate your insulation costs

Why Choose Isotherm Insulation?

Isotherm stands out in both environmental and functional performance:

✅ Eco-Conscious – Crafted from 100% recycled PET bottles and fully recyclable
✅ Safe & Skin-Friendly – Non-allergenic, non-irritant polyester feels like soft fabric
✅ Thermal Efficiency – Typical R-values range from 0.82 to 3.37 depending on thickness
✅ Moisture-Resistant – Absorbs less than 2% moisture and dries quickly
✅ Fire Safety – Classified B/B1/2 under SANS – (B-class)
✅ Low VOC & Chemical-Free – No added formaldehyde or harmful emissions
✅ Maintenance-Free – Retains shape and loft for the life of your building
✅ Easy to Handle – Lightweight rolls that are easy to cut and install without protective gear
❌ Not SABS Approved – Lost its SABS approval rating

Where Can Isotherm Be Installed?

Residential homes
Townhouses and housing developments
Office ceilings
Light commercial buildings
Between floors for basic acoustic comfort
Retrofit and new construction projects

Isotherm insulation is a great fit for projects focused on comfort, sustainability, and health-conscious living. Its soft, non-irritant polyester fibres make it easy to install in spaces where traditional insulation for roofs might pose handling or skin sensitivity issues.

While not fire-rated for high-risk or regulated environments, Isotherm performs well in typical residential and low-demand commercial applications where natural materials and energy savings are key goals.

Thickness	R-value	Roll Length	Roll Width	Density	Climate Zone
145mm	3.37	5m	1.2m	11.5kg	Johannesburg
135mm	3.14	5m	1.2m	11.5kg	Johannesburg
100mm	2.33	6m	1.2m	10kg	Durban
75mm	1.53	8m	1.2m	10kg	Top Up Layer
50mm	1.02	10m	1.2m	10kg	Top Up Layer
40mm	0.82	10m	1.2m	10kg	Top Up Layer

145mm Isotherm Insulation

Upgrade your home with 145mm Isotherm Insulation, the top-tier polyester (PET) option for South Africa’s colder climates like Johannesburg, Pretoria, and Cape Town. With an R-value of 3.37, this thickness gives you maximum thermal efficiency and energy savings.

Each roll measures 5 m long × 1.2 m wide, covering 6 m² per roll, and is made from 100% recycled PET bottles. Lightweight, non-irritant, and easy to handle, the 145mm Isotherm is ideal for ceilings and pitched roofs. It offers reliable performance — delivering warmth, and moisture resilience, with a B/B1/2 SANS fire classification.

Product Specifications

Brand: Isotherm
Material: Recycled PET polyester
Thickness: 145mm Isotherm
R-Value: 3.37
Length: 5,000mm
Width: 1,200mm
Coverage: 6 m² per roll
Density: 11.5 kg
Fire Classification: B/B1/2 (B-class)
Moisture Absorption: <2% — dries quickly after exposure
SABS Approved: ❌ No
Skin-Friendliness: Non-irritant polyester, no formaldehyde

Choose 145mm Isotherm Insulation for maximum performance and eco-friendly living. It’s an excellent choice for cold-climate ceilings, lofts, or pitched roofs where durability, comfort, and energy savings are essential. Please note: Isotherm is not SABS-approved.

Get a quote today or order online for fast delivery and professional installation across South Africa.

135mm Isotherm Insulation

Get thermal comfort with 135mm Isotherm Insulation, a polyester insulation roll designed for colder South African regions like Johannesburg, Pretoria, and Cape Town. With an R-value of 3.14, this product delivers energy efficiency, helping to reduce heating and cooling costs year-round.

Each roll covers 6m², with dimensions of 5m × 1.2m, and weighs approximately 10.15kg. Made from 100% recycled PET plastic, the 135mm Isotherm is non-toxic, non-irritant, and contains no harmful chemicals — For homeowners looking for an eco-friendly, skin-safe insulation solution. It’s also SANS compliant, although not SABS approved.

Product Specifications

Brand: Isotherm
Material: Recycled polyester (PET)
Thickness: 135mm Isotherm
R-Value: 3.14
Length: 5,000mm
Width: 1,200mm
Coverage: 6m² per roll
Weight: 10.15kg
Moisture Absorption: <2%
Fire Rating: B/B1/2 (B-class)
SABS Approved: ❌ No
Skin-Friendliness: Non-irritant, no protective gear needed

Choose 135mm Isotherm Insulation for sustainable, long-lasting roof insulation that delivers real energy savings. It’s perfect for pitched roofs, ceilings, and attic spaces where insulation is needed — all without the itch or chemicals. Get a free quote or order online for fast delivery and expert installation.

100mm Isotherm Insulation

Improve your home’s energy efficiency with 100mm Isotherm Insulation, an eco-friendly polyester insulation roll made from 100% recycled PET plastic. With an R-value of 2.04 and an installed R-value of 2.44, this thickness is ideal for moderate climates like Durban, East London, and coastal regions of South Africa.

Each roll measures 6m x 1.2m, covering 7.2m², and weighs approximately 10kg. Lightweight, non-toxic, and safe to handle, the 100mm Isotherm is formaldehyde-free, non-irritant, and offers basic thermal insulation while supporting a healthy indoor environment. It is SANS compliant for Durban, although not SABS approved.

Product Specifications

Brand: Isotherm
Material: Recycled polyester (PET)
Thickness: 100mm Isotherm
R-Value: 2.04
Length: 6,000mm
Width: 1,200mm
Coverage: 7.2m² per roll
Weight: 10kg
Moisture Absorption: <2%
Fire Rating: B/B1/2 (B-class)
SABS Approved: ❌ No
Skin-Friendliness: Safe to touch, no protective gear needed

Choose 100mm Isotherm Insulation for basic thermal performance and eco-conscious design. It’s perfect for ceilings and roof spaces in temperate zones, providing long-term energy savings, quiet comfort, and a safer indoor environment. Order online or contact us for a free quote and professional installation across South Africa.

75mm Isotherm Insulation

Add lightweight, eco-friendly insulation to your home with 75mm Isotherm, designed for basic thermal performance in South African homes. With an R-value of 1.53, this insulation is ideal for internal partitions, between floors, or regions with milder climates where moderate insulation is sufficient.

Each roll measures 8m × 1.2m, covering 9.6m², and weighs approximately 7.85kg. Manufactured from 100% recycled PET plastic, the 75mm Isotherm is non-toxic, non-irritant, and contains no added chemicals. It’s safe to install without protective gear and offers a cleaner, more comfortable indoor environment. While this product is not SABS approved and not SANS compliant, it remains an eco-conscious option for non-critical applications.

Product Specifications

Brand: Isotherm
Material: Recycled polyester (PET)
Thickness: 75mm Isotherm
R-Value: 1.53
Length: 8,000mm
Width: 1,200mm
Coverage: 9.6m² per roll
Weight: 7.85kg
Moisture Absorption: <2%
Fire Rating: B/B1/2 (B-class)
SABS Approved: ❌ No
SANS Compliant: ❌ No
Skin-Friendliness: Safe to handle, no irritation

Choose 75mm Isotherm Insulation for non-critical areas. Perfect for internal walls, sound insulation between floors, or installations where basic energy efficiency is needed without the irritation or chemical additives of traditional materials. Order online or request a quote for delivery and installation.

50mm Isotherm Insulation

Achieve basic thermal performance with 50mm Isotherm Insulation, a lightweight, eco-friendly option for internal walls, ceiling overlays, and between-floors. With an R-value of 1.02, it’s a suitable choice for non-critical applications where moderate insulation is needed.

Each roll measures 10m × 1.2m, covering 12m², and weighs approximately 6.55kg. Made from 100% recycled PET plastic, the 50mm isotherm is non-irritant, non-toxic, and contains no added chemicals — making it safe to install without gloves or masks.

Please note: 50mm Isotherm is not SABS approved and is not SANS compliant, making it best suited for supplementary insulation or areas where regulatory compliance is not required.

Product Specifications

Brand: Isotherm
Material: Recycled polyester (PET)
Thickness: 50mm Isotherm
R-Value: 1.02
Length: 10,000mm
Width: 1,200mm
Coverage: 12m² per roll
Weight: 6.55kg
Moisture Absorption: <2%
Fire Rating: B/B1/2 (B-class)
SABS Approved: ❌ No
SANS Compliant: ❌ No
Skin-Friendliness: Non-irritant, safe to install by hand

Choose 50mm Isotherm Insulation for supplementary insulation or basic thermal protection in areas that don’t require full regulatory compliance. It’s ideal for DIY upgrades, or layering with other materials. Request a quote or order online with fast delivery and installation available across South Africa.

40mm Isotherm Insulation

Lightweight and flexible, 40mm Isotherm Insulation is ideal for applications where minimal thermal resistance is required, such as internal partitioning, or as a supplementary insulation layer. With an R-value of 0.82, it offers moderate energy efficiency while being soft, safe, and simple to install.

Each roll measures 10m × 1.2m, providing a generous 12m² of coverage, and weighs approximately 5.35kg. Made from 100% recycled PET plastic bottles, this insulation is non-toxic, non-irritant, and safe for both installers and building occupants.

Please note: 40mm Isotherm is not SABS approved and not SANS compliant, so it’s best used for non-critical insulation tasks.

Product Specifications

Brand: Isotherm
Material: Recycled polyester (PET)
Thickness: 40mm
R-Value: 0.82
Length: 10,000mm
Width: 1,200mm
Coverage: 12m² per roll
Weight: 5.35kg
Moisture Absorption: <2%
Fire Rating: B/B1/2 (B-class)
SABS Approved: ❌ No
SANS Compliant: ❌ No
Skin-Friendliness: Soft, safe to handle without protective gear

Choose 40mm Isotherm Insulation for light-duty thermal performance in walls, ceilings, and non-regulated spaces. It’s an option for DIY projects, retrofits, or interior partition upgrades where basic insulation is needed without compromise on safety or comfort. Contact us for expert advice, a quote, or quick nationwide delivery.

Thermal Insulation cost for homes and buildings

Why Choose Home Insulations?

We’ve installed thousands of square metres of Isotherm insulation across South Africa. Here’s why homeowners and contractors trust us:

✅ Over 30 years of insulation experience
✅ Friendly, trained installers
✅ Prompt delivery and professional installation
✅ Branches in Johannesburg, Centurion, Pretoria, Cape Town & Durban
✅ We only use genuine Isotherm (no imitation products)

Frequently Asked Questions

Why is Isotherm no longer SABS approved?

Isotherm insulation no longer holds SABS approval because it failed to meet updated requirements set out by the South African Bureau of Standards. While it was previously certified, changes in either product composition, manufacturing standards, or testing compliance resulted in the loss of its SABS certification.

This means Isotherm does not meet the official criteria for safety, quality, or performance as defined by the SABS. For projects that require SABS-approved materials — such as government tenders or large-scale developments — alternative products like Aerolite or Knauf should be considered.

Is Isotherm fireproof?

No, Isotherm is not fireproof. It carries a B/B1/2 (B-class) fire rating under SANS standards, which means it is combustible but self-extinguishing. While it will not cause flames to spread rapidly, it can catch fire if exposed to direct flame or high heat. For applications requiring non-combustible insulation, consider alternatives like Aerolite or Knauf, which carry an A1 fire rating and are fully fire-resistant.

How effective is Isotherm?

Isotherm insulation is effective for general thermal performance, especially in residential ceilings and internal walls. However, it does not match the performance levels of glasswool products like Knauf or Aerolite, which offer higher R-values per millimeter, better fire resistance, and greater overall energy efficiency and soundproofing.

While Isotherm is a good option for eco-conscious buyers looking for a non-irritant, polyester-based product, it may not be the best choice for cold climates or areas where maximum insulation performance is needed.

What is Isotherm insulation made of?

Isotherm insulation is made from 100% recycled PET plastic, the same type of plastic used in water and cooldrink bottles. The plastic is melted down and spun into soft polyester fibres, creating a non-toxic, non-irritant insulation material.

What other insulation products should I consider?

If you’re exploring additional insulation options, we offer a full range of high-performance insulation solutions:

✔ 135mm Knauf — Earthwool glasswool insulation with ECOSE® Technology, providing maximum R-values, acoustic comfort, and fire protection.

✔ 135mm Aerolite — Premium glasswool insulation offering excellent thermal and acoustic performance with Class A1 fire safety.

✔ 145mm Fabufill — Non-itch, formaldehyde-free polyester insulation, fully SABS-approved for safe indoor use.

✔ 145mm Isotherm — Eco-friendly polyester insulation made from recycled PET bottles, perfect for family homes.

✔ Cavitybatt — High-density cavity wall insulation for internal partitions and drywall systems, providing both thermal and acoustic benefits.

✔ Factorylite — Foil-laminated glasswool insulation for industrial and commercial roofing applications.

✔ Summit XPS Boards — High-density extruded polystyrene sheets for ceilings, walls, and floors, offering exceptional thermal insulation and moisture resistance.

✔ RadenShield — Reflective radiant barrier foil for reducing heat gain under tile or metal roofing systems.

✔ Sisalation — Durable, multi-layer foil insulation with excellent vapor barrier properties for roofs and walls.

✔ Scrim Foil — Cost-effective double-sided foil with scrim reinforcement for residential and light commercial roofs.

✔ Alucushion — Fire-retardant bubble foil insulation offering thermal and moisture control, ideal for warehouses and industrial roofs.

✔ Alububble — Premium multi-layer bubble foil insulation for homes, garages, and light commercial buildings.

✔ Geyser Blankets — High-efficiency geyser insulation wraps designed to minimize heat loss from your water heater and save on energy bills.

Each product offers unique features for different roof types, ceiling systems, wall structures, and climate conditions. If you need assistance selecting the ideal insulation solution for your home or building, contact us for expert guidance and fast quotations.

Additional information

Isotherm Thickness	145mm Isotherm , 135mm Isotherm , 100mm Isotherm , 75mm Isotherm , 50mm Isotherm , 40mm Isotherm

Shipping & Delivery

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

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Isotherm Insulation (145mm / 135mm / 100mm / 75mm / 50mm / 40mm)

Isotherm Insulation For South African Homes