Knauf Insulation Prices, Sizes, R-Values & Specifications
Knauf Insulation is one of the most advanced ceiling insulation products available in South Africa and is widely used in residential, commercial and industrial buildings. Manufactured using innovative ECOSE® Technology, Knauf Earthwool insulation delivers excellent thermal performance, outstanding acoustic absorption, improved indoor comfort and long-term energy savings.
Whether you are building a new home, upgrading an existing property or improving the energy efficiency of a commercial building, Knauf Insulation provides a proven solution for reducing heat transfer through the roof while creating a more comfortable indoor environment throughout the year.
At Roof Insulation South Africa, we supply a full range of Knauf Earthwool ceiling insulation products, including 50mm, 75mm, 100mm and 135mm thicknesses. Our experienced team can assist with product selection, quantity calculations, delivery and professional installation services.
Why Choose Knauf Insulation?
Roof spaces are responsible for a significant percentage of heat gain during summer and heat loss during winter. Without adequate ceiling insulation, air conditioning and heating systems must work harder, increasing electricity consumption and reducing comfort levels.
Knauf Earthwool insulation offers several important advantages:
- Excellent thermal performance
- Superior acoustic absorption
- Non-combustible glass mineral wool
- Manufactured using ECOSE® Technology
- Formaldehyde-free binder technology
- Soft-touch handling characteristics
- Long service life
- Resistant to mould and vermin
- Environmentally responsible manufacturing process
- Suitable for residential and commercial applications
Unlike many traditional insulation products, Knauf Earthwool contains no added formaldehyde, phenols or artificial colours, making it more pleasant to handle during installation.
What Is ECOSE® Technology?
One of the key differences between Knauf Earthwool and conventional glasswool insulation is the use of ECOSE® Technology.
ECOSE® Technology is a bio-based binder system that replaces traditional petrochemical binders commonly used in insulation manufacturing. This results in:
- Lower environmental impact
- Improved indoor air quality
- Reduced manufacturing emissions
- Softer, less irritating fibres
- Odour-free insulation products
This technology has helped make Knauf one of the world’s leading insulation manufacturers.
Knauf Insulation Thickness Guide
Choosing the correct insulation thickness depends on your climate zone, budget and energy efficiency goals.
50mm Knauf Insulation
50mm Knauf Earthwool is ideal for:
- Budget-conscious insulation projects
- Existing homes with limited roof space
- Mild climate regions
- Basic thermal improvement requirements
Typical Applications:
- Residential homes
- Garages
- Offices
- Rental properties
75mm Knauf Insulation
75mm Knauf provides a noticeable improvement in thermal performance while remaining cost effective.
Recommended for:
- Residential homes
- Townhouses
- Office buildings
- Retail premises
Benefits:
- Improved summer cooling
- Better winter heat retention
- Enhanced acoustic performance
100mm Knauf Insulation
100mm Knauf is one of the most popular options for South African homes.
Ideal for:
- New residential construction
- Energy-efficient renovations
- Commercial buildings
- High-performance roofing systems
Benefits include:
- Excellent thermal resistance
- Improved energy savings
- Reduced HVAC operating costs
135mm Knauf Insulation
135mm Knauf Earthwool delivers the highest thermal performance available in the standard residential range.
Recommended for:
- Premium homes
- Coastal properties
- Energy-efficient buildings
- Green building projects
- Areas with extreme seasonal temperature variations
This thickness offers exceptional comfort and maximum long-term electricity savings.
Knauf Insulation Specifications
| Thickness | Roll Size | Coverage | Installed R-Value | NRC |
|---|---|---|---|---|
| 50mm | 19m x 1.2m | 22.8m² | 1.68 | 0.70 |
| 75mm | 10m x 1.2m | 9.6m² | 2.18 | 0.85 |
| 100mm | 10.10m x 1.2m | 12.12m² | 2.90 | 1.00 |
| 135mm | 7.5m x 1.2m | 9m² | 3.78 | 1.15 |
Specifications may vary depending on product updates and installation methods.
Knauf R-Values Explained
The R-value measures a material’s resistance to heat transfer.
The higher the R-value:
- The better the insulation performance
- The greater the energy savings
- The improved indoor comfort levels
- The lower heating and cooling costs
For South African conditions, higher R-values are particularly beneficial in areas experiencing hot summers and cold winters.
Knauf Acoustic Performance
Knauf Earthwool is not only an effective thermal insulation product but also a highly effective sound absorber.
Benefits include:
- Reduced outside noise
- Lower traffic noise penetration
- Improved room acoustics
- Reduced rain noise on metal roofs
- Better privacy between spaces
The higher-density structure of Knauf Earthwool helps absorb airborne sound energy, making it a popular choice for homes, offices, schools and commercial buildings.
Knauf Insulation Fire Performance
Safety is an important consideration when selecting insulation products.
Knauf Earthwool insulation is manufactured from non-combustible glass mineral wool and contributes significantly to fire safety within buildings.
Benefits include:
- Non-combustible material composition
- Improved roof cavity fire resistance
- No support for flame spread
- Suitable for residential and commercial applications
Always follow applicable building regulations and manufacturer installation guidelines.
Knauf Insulation Installation
Correct installation is essential for achieving maximum thermal performance.
Our installation process includes:
- Roof inspection
- Quantity calculation
- Preparation of roof space
- Placement between roof trusses
- Full ceiling coverage
- Inspection of gaps and penetrations
- Final quality control
Proper installation ensures consistent thermal coverage and optimal energy efficiency.
Knauf vs Aerolite Insulation
Both products are popular glasswool insulation options.
Knauf Advantages:
- ECOSE® Technology
- Softer handling
- Higher acoustic absorption
- Modern manufacturing process
Aerolite Advantages:
- Long-standing South African brand recognition
- Widely available nationwide
Both products provide excellent thermal performance when correctly installed. Knauf being earth wool and Isotherm insulation a polyester base insulation.
Knauf vs Isotherm Insulation
Knauf Earthwool and Isotherm are among South Africa’s leading insulation products.
Knauf Advantages:
- Glass mineral wool construction
- Excellent acoustic performance
- Non-combustible material
- ECOSE® Technology
Isotherm Advantages:
- Polyester fibre construction
- Non-itch characteristics
- Lightweight handling
The best option depends on project requirements, budget and performance expectations.
Knauf Insulation Prices South Africa
Knauf insulation prices vary depending on:
- Thickness selected
- Project size
- Delivery location
- Quantity ordered
- Installation requirements
For the most accurate pricing, request a quotation based on your specific roof area and insulation requirements.
Frequently Asked Questions
Is Knauf insulation worth the money?
Yes. Knauf provides excellent long-term energy savings and indoor comfort improvements.
Which Knauf insulation thickness is best?
For most South African homes, 100mm and 135mm offer the best overall performance.
Does Knauf insulation reduce electricity costs?
Yes. Properly installed insulation reduces heat transfer, lowering heating and cooling requirements.
How long does Knauf insulation last?
Knauf insulation is designed to provide decades of performance when correctly installed and protected from moisture.
Is Knauf insulation safe?
Yes. Knauf Earthwool is manufactured using ECOSE® Technology and contains no added formaldehyde.
Can Knauf insulation get wet?
Insulation should always be kept dry. Roof leaks should be repaired immediately to maintain insulation performance.
Does Knauf insulation help with noise reduction?
Yes. Knauf offers excellent acoustic absorption and can significantly reduce outside noise levels.
Can Knauf insulation be installed in existing homes?
Yes. Most existing homes can be retrofitted with Knauf insulation without major structural modifications.
What areas do you supply?
We supply Knauf insulation throughout South Africa.
Do you offer installation?
Yes. Professional installation services are available in selected regions.
Request a Knauf Insulation Quote
Whether you require 50mm, 75mm, 100mm or 135mm Knauf Earthwool insulation, our experienced team can assist with product selection, quantity calculations, delivery and installation.
Contact us today for expert advice and a competitive quotation.
How Much Money Can Knauf Insulation Save?
One of the main reasons homeowners install Knauf Insulation is to reduce electricity consumption and improve indoor comfort throughout the year.
During summer, roof spaces can reach temperatures exceeding 50°C. Without adequate ceiling insulation, this heat transfers into living spaces, causing air conditioners and fans to work harder.
During winter, valuable heat escapes through the ceiling, increasing heating costs and reducing comfort levels.
Knauf Insulation helps slow heat transfer through the roof structure, creating a more stable indoor temperature throughout the year.
Benefits may include:
- Lower air conditioning costs
- Reduced heating expenses
- Improved year-round comfort
- Less strain on HVAC equipment
- Increased property value
- Improved energy efficiency
Many homeowners notice a significant difference in indoor temperatures immediately after installation.
Knauf Insulation for South African Climate Zones
South Africa experiences a wide range of climatic conditions, from hot inland regions to cold winter rainfall areas and humid coastal environments.
Western Cape
The Western Cape experiences hot summers and cool, wet winters. Higher-performance insulation such as 100mm or 135mm Knauf is generally recommended to maintain comfort throughout the year.
Gauteng
Gauteng experiences hot summers and cold winter nights. Knauf insulation helps reduce heat gain during summer while retaining warmth during winter.
KwaZulu-Natal
Coastal humidity and summer heat make ceiling insulation an important component of energy-efficient homes and buildings.
Eastern Cape
Variable weather conditions throughout the year make Knauf insulation a valuable investment for improved indoor comfort.
Free State and Northern Cape
Extreme temperature differences between summer and winter can make higher R-value insulation particularly beneficial.
Why 135mm Knauf Insulation Is Our Most Popular Option
135mm Knauf Earthwool provides the highest thermal performance in the standard residential range and is often selected for premium homes and energy-efficient buildings.
Advantages include:
- Installed R-Value of approximately 3.78
- Exceptional thermal performance
- Maximum energy savings
- Improved indoor comfort
- Outstanding acoustic absorption
- Excellent return on investment
For homeowners planning long-term occupancy, 135mm Knauf often provides the greatest overall benefit.
Why 100mm Knauf Insulation Offers The Best Balance Of Price And Performance
100mm Knauf insulation remains one of the most popular products in South Africa due to its balance between affordability and performance.
It is commonly selected for:
- New residential homes
- Renovation projects
- Office buildings
- Schools
- Retail developments
Benefits include:
- Strong thermal performance
- Good acoustic absorption
- Excellent value for money
- Reduced energy consumption
- Suitable for most South African climates
Many homeowners choose 100mm Knauf as the ideal compromise between upfront cost and long-term energy savings.
Residential Applications For Knauf Insulation
Knauf insulation is widely used in residential construction throughout South Africa.
Common applications include:
- Family homes
- Townhouses
- Apartments
- Holiday homes
- Retirement estates
- Luxury residential developments
Homeowners typically install Knauf insulation to improve comfort while reducing heating and cooling costs.
Commercial Applications For Knauf Insulation
Commercial buildings can experience substantial energy losses through uninsulated roof spaces.
Knauf insulation is frequently specified for:
- Offices
- Warehouses
- Schools
- Universities
- Retail centres
- Healthcare facilities
- Government buildings
- Industrial facilities
The combination of thermal and acoustic performance makes Knauf a popular choice for commercial projects throughout South Africa.
Environmental Benefits Of Knauf Earthwool Insulation
Modern building owners are increasingly focused on sustainability and reducing environmental impact.
Knauf Earthwool contributes to greener building practices through:
- ECOSE® Technology
- Reduced manufacturing emissions
- Long product lifespan
- Improved building energy efficiency
- Lower carbon footprint
- Reduced heating and cooling energy demand
The energy saved during the life of the insulation significantly exceeds the energy used during manufacturing.
Signs Your Home Needs Ceiling Insulation
Many South African homes still have little or no ceiling insulation installed.
Common signs include:
- Extremely hot rooms during summer
- Cold indoor temperatures during winter
- High electricity bills
- Uneven temperatures between rooms
- Excessive air conditioner use
- Constant use of heaters during winter
If your home experiences any of these issues, upgrading your ceiling insulation may provide immediate benefits.
Why Buy Knauf Insulation From Roof Insulations South Africa?
With more than 36 years of insulation industry experience, we understand the products, applications and installation requirements needed to achieve the best possible results.
We offer:
- Expert product advice
- Free quantity calculations
- Competitive pricing
- Nationwide delivery
- Professional installation services
- Technical support
- High-quality insulation products
- Fast quotations
Whether you require insulation for a small residential project or a large commercial development, our team can assist with selecting the most suitable Knauf insulation solution.
Tricha –
Absolutely brilliant service. Prompt reply from Louise-Ann. Installation was done without any hassle by a great team. Definitely recommend them.
Louise –
Great service. Delivery was done as arranged. Friendly staff.
Will reccommend.