Ceiling Insulation Prices & Products
The Foundation of an Energy Efficient Home
Shop ceiling insulation from Aerolite, Knauf and Isotherm for new homes, renovations and upgrades to existing ceilings. Compare insulation rolls by thickness, coverage and thermal performance, then select a product to see its current price and ordering options.
Roof Insulations brings more than 36 years of insulation experience to your project. Whether you need a few rolls or a bulk supply quote, we can help you work out quantities and compare suitable options. Contact us to confirm delivery to your area or request professional installation in Cape Town and surrounding areas through Cape Ceilings & Drywalling.
⭐ 36+ years of experience
⭐ Thousands of installations
⭐ Trusted insulation brands
⭐ Residential & commercial
Ceiling Insulation — The Foundation of an Energy-Efficient Home
If your home is too hot in summer, freezing in winter, or your electricity bill keeps climbing, the problem is almost always poor ceiling insulation. Installing the right insulation is the single most effective way to stabilise indoor temperatures and reduce energy costs.
We supply South Africa’s most trusted insulation brands, including Aerolite, Knauf, Isotherm and Factorylite, along with high-performance thermal ceiling boards like Isoboard and Summit XPS. Whether you are insulating a new build, upgrading an existing home, or working on a commercial project, we have a solution that delivers proven results.
✔ Reduce heating and cooling costs
✔ Improve comfort year-round
✔ Meet building regulations
✔ Increase property value
✔ Long-lasting performance
Ceiling Insulation That Actually Makes a Difference
Ceiling insulation remains one of the most important investments any homeowner or property developer can make. A properly insulated ceiling dramatically reduces heat transfer, improves indoor comfort, lowers electricity consumption, and extends the lifespan of roofing structures. In South Africa’s varied climate — from hot summers to cold winter nights — the right insulation makes all the difference between a comfortable home and one that constantly struggles to maintain a comfortable temperature.
Modern insulation solutions have undergone significant evolution over the years. Today’s products offer superior thermal resistance, improved fire safety, better acoustic performance, and environmentally responsible materials. Whether you are building new, renovating, or upgrading an existing property, choosing the correct ceiling insulation system ensures long-term performance and measurable energy savings.
Our range includes industry-leading insulation solutions trusted by contractors, builders, and homeowners across South Africa. From traditional glass wool insulation to advanced polyester insulation and rigid thermal boards, we supply solutions for every application and budget.
Ceiling Insulation Products
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Aerolite Insulation
Price range: R422.73 through R616.17 Ceiling InsulationBuy Aerolite® Soft Touch ceiling insulation in 50mm, 100mm and 135mm rolls. This SABS-marked, non-combustible glasswool insulation helps reduce summer heat gain, winter heat loss and noise through ceilings. Select a thickness to view the current roll price and coverage. Nationwide delivery is available, with professional installation in Cape Town and surrounding areas.
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Factorylite Insulation
Price range: R1,093.33 through R2,103.71 Ceiling InsulationFactorylite insulation by Isover is a high-performance glasswool roof insulation blanket designed for industrial, commercial, and large-span roofing applications. Available in White Metalized Foil and Silver Foil facings with thickness options of 50mm, 75mm, 100mm, and 135mm, Factorylite delivers excellent thermal performance, acoustic control, condensation protection, and non-combustible fire safety compliance.
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Isotherm Insulation
Price range: R466.03 through R741.38 Ceiling InsulationIsotherm Insulation is a high-performance polyester ceiling insulation made from recycled PET fibres. Safe to handle, non-itch, and built for South African climates. Choose from 145mm, 135mm, 100mm, 75mm, or 50mm thicknesses to match your required R-value and achieve optimal energy savings. Reduces heat loss in winter and blocks heat in summer while lowering electricity costs year-round
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Knauf Insulation
Price range: R949.53 through R1,081.58 Ceiling InsulationKnauf Insulation is a high-performance glass mineral wool ceiling insulation made with ECOSE® Technology. Available in 50mm, 75mm, 100mm and 135mm thicknesses, it provides dependable thermal and acoustic performance, an A1 non-combustible fire classification, and a soft-touch, low-dust binder with no added formaldehyde or phenol. Select a thickness to view the current Knauf insulation price, roll coverage and R-value. Western Cape delivery is available, with professional installation in Cape Town and surrounding areas.
Compare Ceiling Insulation Options
| Product | Material | What to compare | Prices and options |
|---|---|---|---|
| Aerolite Soft Touch | Glasswool | Selected thickness, roll coverage and product R-value | View Aerolite insulation |
| Knauf Ceiling Roll | Glass mineral wool with ECOSE® Technology | Selected thickness, roll coverage and product R-value | View Knauf insulation |
| Isotherm | Polyester fibre | Selected thickness, pack coverage and the specification of the product supplied | View Isotherm insulation |
Aerolite and Knauf are glasswool options for customers comparing thermal insulation for ceiling spaces. Isotherm provides a polyester alternative for customers who prefer that material. Open each product page to check the available options before placing an order.
For a more detailed comparison of the two glasswool brands, read our Aerolite vs Knauf insulation guide.
Understanding Ceiling Insulation Prices
The cost of your order depends on the product, thickness, coverage and quantity required. Delivery and installation should be considered separately when comparing the total project cost.
For a useful material-price comparison, divide the selected roll or pack price by its stated coverage:
Price per m² = roll or pack price ÷ coverage in m².
For example, a hypothetical roll costing R600 and covering 6 m² works out to R100/m² for the material. This is a calculation example, not a current product price or installation quote.
Compare prices using the same VAT basis and similar thermal performance. A thinner product may cover more area per roll, but it may not provide the performance your project requires. Also remember that whole-roll purchasing and unusable offcuts can increase your actual material cost per square metre of ceiling.
Select a thickness on the relevant product page for its current price. For larger quantities, ask us for a quote, clearly stating the product, thickness, ceiling area, and delivery suburb.
Choosing the Right Thickness
Choose ceiling insulation based on the required thermal resistance, available space, and the condition of any existing material. Thickness matters, but the published product R-value gives a more useful basis for comparing different insulation materials.
A higher R-value means greater resistance to heat flow. Check the value for the exact product and thickness you intend to buy. Do not assume that two different materials will perform identically because they have the same thickness.
If you are upgrading an existing ceiling, tell us what insulation is already fitted and whether it is dry, evenly laid and in good condition. That helps us discuss a suitable replacement or top-up option without treating every roof as the same project.
How Many Rolls Do You Need?
Measure the ceiling area to be insulated in square metres. Divide that area by the coverage of your selected roll or pack, then round up to a whole purchasing unit.
Number of rolls = ceiling area ÷ coverage per roll, rounded up.
For example, a 90m² ceiling using a product that covers 9m² per roll requires ten rolls before any allowance for cutting waste or awkward areas. Measure extensions and separate ceiling sections too; the overall property floor area may not match the area that needs insulation.
Send us your measurements if you would like help estimating quantities. For an accurate supply quote, include the preferred product and thickness as well as your delivery location.
Delivery and Installation
Contact Roof Insulations to confirm delivery availability, charges and lead times for your selected products and address. Insulation is bulky, so the delivery location and order size are useful details to provide before finalising your purchase.
Professional ceiling insulation installation is available in Cape Town and surrounding areas through Cape Ceilings & Drywalling. Request a quote that separates insulation supply from installation labour so you can see what is included.
For installation enquiries, include the approximate ceiling area, property location, roof access and any existing insulation. Photographs can help us understand the project before arranging the next step.
Looking for Ceiling Boards or Industrial Insulation?
If your project includes a new exposed ceiling finish, browse our ceilings and ceiling boards. This is where you can explore board options alongside your ceiling design requirements.
For Factorylite and other products intended for industrial applications, visit our industrial insulation category. Selecting by application makes it easier to find the relevant product information.
Why Ceiling Insulation Matters More Than Any Other Insulation
Heat naturally rises, which means the ceiling is the largest area of heat loss during winter and heat gain during summer. Without insulation, up to 35–40% of a home’s energy can be lost through the roof space.
Installing quality insulation provides:
Lower heating and cooling costs
Improved indoor comfort year round
Reduced strain on air conditioning systems
Better acoustic control
Increased property value
Reduced environmental impact
Types of Ceiling Insulation Available
Understanding the different types of insulation helps ensure the correct product is selected for each application.
Glass Wool Insulation
Glass wool remains one of the most widely used insulation materials due to its excellent thermal performance, fire resistance, and affordability.
Polyester Insulation
Polyester insulation is soft to handle, non-itchy, environmentally friendly, and highly durable. It is ideal for residential homes and eco-focused builds.
Comercial Insulation
Designed for commercial and industrial environments where higher thermal performance or acoustic control and higher temperature is required. Include applications high heat ovens.
Thermal Ceiling Boards
Designed for domestic and industrial environments where higher thermal performance is required. Rigid Ceilings offer a water resistant high R-value ceiling option.
Aerolite Insulation — Proven Performance for Residential Homes
Aerolite insulation has been a trusted name in South Africa for decades. Manufactured from glass wool, it provides excellent thermal resistance and fire safety.
Key Benefits
Non-combustible
Excellent thermal performance
Lightweight and easy to install
Long lifespan
Cost effective
Aerolite is ideal for residential homes, apartments, and light commercial applications where reliable performance and affordability are essential.
Knauf Insulation — Advanced Technology with Superior Comfort
Knauf insulation is known for its advanced fibre technology and superior thermal efficiency. Manufactured using modern, eco-friendly processes, it offers outstanding performance while maintaining a soft texture for easier installation.
Key Benefits
High thermal resistance
Excellent acoustic performance
Sustainable manufacturing
Low dust and improved air quality
Long-term durability
Knauf insulation is a premium option suited for homeowners looking for high performance and long-term reliability.
Isotherm Insulation — Environmentally Friendly Thermal Protection
Isotherm insulation is made from recycled polyester fibres and is one of the most environmentally friendly insulation options available.
Key Benefits
Non-toxic and non-allergenic
Dust-free installation
Long lifespan
Excellent thermal performance
Resistant to moisture
Isotherm is particularly popular for residential applications where comfort, sustainability, and indoor air quality are priorities.
Factorylite Insulation — High-Density Performance for Commercial Use
Factorylite insulation is designed for commercial and industrial environments where higher densities and superior acoustic control are required.
Key Benefits
High-density insulation
Excellent acoustic control
Fire resistant
Ideal for offices and industrial buildings
This product is often used in commercial ceilings, factories, and large buildings requiring enhanced thermal and acoustic performance.
Thermal Ceiling Boards — Insulation and Ceiling Finish Combined
Rigid insulation boards provide an all-in-one ceiling solution that combines insulation with a clean finished look.
Isoboard Thermal Ceiling
Isoboard offers exceptional thermal performance and moisture resistance, making it ideal for modern homes and commercial buildings.
Summit XPS Ceiling Boards
Summit XPS boards provide high compressive strength and excellent insulation performance, making them suitable for high-performance ceiling systems.
Choosing the Right Ceiling Insulation
Selecting the correct insulation depends on several factors:
Climate conditions
Budget
Required thermal performance
Fire safety requirements
Acoustic performance needs
Roof structure
Homes typically benefit from medium-density insulation, while commercial buildings may require higher-density products for improved performance.
Energy Savings and Return on Investment
Ceiling insulation typically pays for itself within a few years through reduced energy bills. Once installed, it continues delivering savings for decades while improving comfort levels.
Compliance with South African Building Regulations
Proper insulation helps meet SANS energy efficiency requirements and improves overall building compliance. Installing approved insulation ensures your property meets modern energy standards.
Professional Installation vs DIY
While some insulation can be installed by homeowners, professional installation ensures correct coverage, optimal performance, and compliance with safety standards.
Long-Term Performance and Durability
High-quality insulation maintains its thermal performance for decades without needing replacement. Investing in trusted brands ensures consistent performance and reliability.
Environmental Benefits
Reducing energy consumption lowers carbon emissions and contributes to a more sustainable environment. Modern insulation products are designed with environmental responsibility in mind.
Signs Your Home Needs Ceiling Insulation
Hot rooms in summer
Cold rooms in winter
High electricity bills
Uneven indoor temperatures
Drafts
Why Buy Ceiling Insulation From Us
Trusted insulation brands
Competitive pricing
Expert advice
Bulk supply options
Reliable stock availability
Ceiling Insulation FAQs
Which ceiling insulation should I buy?
Compare the required thermal performance, material, coverage and total project cost. Aerolite and Knauf are glasswool options, while Isotherm is polyester. Tell us about your ceiling and preferred material if you need help narrowing the selection.
How much does ceiling insulation cost per square metre?
Divide the current price of the selected roll or pack by its stated coverage. Compare products at the performance your project needs, and account separately for delivery, installation and any unused material.
Why do different rolls cover different areas?
Roll dimensions vary by product and thickness. Always use the coverage listed for the exact option you are ordering. Do not calculate an entire order using the coverage of a different thickness from the same brand.
Can I buy insulation without installation?
Yes. You can purchase insulation for your own project or chosen installer. Select the relevant product and thickness to view ordering options, or request a supply quote for larger quantities.
Can I add new insulation over existing insulation?
An existing installation should be assessed first. Its condition, thickness and coverage affect the proposed upgrade. Let us know what is already in the roof and provide photographs so we can discuss the next step.
Do you supply and install in Cape Town?
Roof Insulations supplies the products, with professional installation available through Cape Ceilings & Drywalling in Cape Town and surrounding areas. Request a quote for your location and ceiling area to confirm the scope and cost.
Will insulation make my rooms cooler in summer?
Ceiling insulation slows heat transfer through the ceiling, helping reduce heat entering from a hot roof space. It also helps retain indoor warmth during colder weather. The result depends on the building and installation; insulation does not actively cool a room.
Can I request a bulk insulation quote?
Yes. Send the product, thickness, required quantity or ceiling area, and delivery suburb. If installation is needed, include roof-access details so the supply and labour requirements can be considered together.
Get Help With Your Insulation Order
Ready to order ceiling insulation? Select a product above to check its options and current price. If you need help with quantities, delivery or installation, call 087 711 0229 or WhatsApp 060 611 4942 with your ceiling area and location.
