Ceiling Insulation for Energy Efficient Homes & Buildings
Ceiling insulation is the single most effective way to control indoor temperature and reduce electricity costs in South African homes and commercial buildings. Without insulation, heat escapes through the roof in winter and pours into your living space during summer. The result is uncomfortable rooms and high energy bills.
Installing quality ceiling insulation immediately improves comfort, lowers heating and cooling costs and protects your building structure. It is affordable, quick to install and pays for itself faster than almost any other building upgrade.
At Roof Insulation, we supply proven, SANS-compliant products trusted by contractors, developers and homeowners across the country. Whether you are insulating a new build or upgrading an older ceiling, we stock the right solution for every budget and performance level.
Why ceiling insulation matters
• Reduces heat loss in winter
• Keeps homes cooler in summer
• Cuts electricity bills significantly
• Reduces outside noise
• Improves fire safety
• Increases property value
Most homes recover the installation cost within a few seasons through energy savings alone.
Our ceiling insulation products
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We stock South Africa’s leading brands:
Aerolite Insulation – reliable glasswool rolls for homes
Isotherm Insulation – eco-friendly polyester insulation
Knauf Insulation – premium German-engineered performance
FactoryLite, CavityLite & CavityBatt – professional cavity solutions
Each product is available in multiple thicknesses and R-values.
How to choose the right thickness
The correct thickness depends on your climate and roof design.
• 100mm – standard residential use
• 135mm – colder areas / best performance
• higher density – commercial or acoustic needs
Thicker insulation provides better thermal resistance (higher R-value) and stronger energy savings.
Glasswool vs Polyester vs Mineral Wool
Glasswool (Aerolite / Knauf)
Excellent value, strong thermal performance, widely used
Polyester (Isotherm)
Non-itch, recycled material, eco-friendly, easy handling
High-density batts
Best for sound control and commercial spaces
Each option works well when installed correctly — the right choice depends on budget and application.
Professional advice & bulk pricing
We supply:
• homeowners
• contractors
• property developers
• large commercial projects
Contact us for bulk discounts or installation guidance.
FAQs
How much insulation do I need?
Measure your ceiling area in m² and match roll coverage.
Is ceiling insulation worth it?
Yes. It’s one of the fastest ROI upgrades you can make.
Can I install it myself?
Yes, but professional fitting ensures full coverage with no gaps.
Does it reduce noise?
Yes. It absorbs airborne sound and rain noise.
Linked Products
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Knauf Insulation
Price range: R949.53 through R1,081.58 Ceiling InsulationKnauf Insulation is a premium German-engineered glass wool ceiling insulation designed for maximum heat control, fire safety and long-term energy savings.
Available in 135mm, 100mm, 75mm and 63mm Acoustic Rolls, Knauf reduces summer heat, keeps homes warmer in winter, and cuts electricity costs year after year.
✔ Non-combustible
✔ Eco-friendly ECOSE® binder
✔ Excellent thermal & acoustic performance
✔ Trusted for residential and commercial ceilingsOrder online today or request a fast quote.
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Aerolite Insulation
Price range: R422.73 through R616.17 Ceiling InsulationTransform your living and working spaces with Aerolite Insulation, the industry-leading thermal and acoustic barrier engineered for superior performance. This SABS-approved and SANS-compliant Insulation delivers exceptional energy efficiency while creating quieter, more comfortable environments.
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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