51mm Cavitylite
In stock
R472,00 incl. VAT
51mm Cavitylite is a flexible Glasswool roll designed for fast coverage of internal wall cavities, timber and steel frame structures, and drywall systems. With an R-value of 1.34, it delivers light acoustic absorption and basic thermal performance, making it a cost-effective insulation option for long wall runs.
Est. Delivery: 20 July – 21 July
51mm Cavitylite – Flexible Acoustic & Thermal Roll Insulation
The 51mm Cavitylite roll is manufactured for installers who need long, continuous insulation lengths rather than individual slabs. Its roll format allows for quick installation across extended cavity walls, reducing joins and minimizing the risk of gaps that can compromise thermal or acoustic performance. Lightweight, easy to handle and non-combustible, 51mm Cavitylite is ideal for residential and commercial internal partitions requiring basic insulation and improved acoustic comfort.
Key Features & Benefits
- Flexible Glasswool roll for fast, continuous cavity wall installation
- Helps reduce sound transfer through internal partitions
- Provides steady thermal resistance with an R-value of 1.34
- Unrolls easily, making it ideal for long sections of drywall
- Fewer joins → reduced risk of heat or sound leakage
- Lightweight and simple to trim to the required length
- Compression packed for reduced transport and storage volume
- Moisture-resistant, odourless and non-hygroscopic
Fire Performance & Safety
- Produced from non-combustible Glasswool
- Tested to SANS 10177 Part 5
- SANS 428 Fire Classification: A/A1/1
- EN 13501 Classification: A1-s1, d0
- Safe for use in internal partitions when correctly installed
The high fire rating ensures 51mm Cavitylite meets the safety requirements for residential, commercial and multi-unit developments.
Environmental & Quality Credentials
- Manufactured under ISO 9001:2015 quality management
- Produced according to ISO 14001:2015 environmental standards
- Made using recycled glass
- Zero ODP (ozone-depleting potential)
- Zero GWP (global-warming potential)
- Will not support mould, fungi or bacteria
- Chemically inert and compatible with all common building materials
51mm Cavitylite Specifications
- Brand: Isover
- Product: Cavitylite (flexible Glasswool roll)
- Application: Drywall systems, cavity walls, steel & timber frame structures
- Thickness: 51 mm
- R-Value: 1.34 m²·K/W
- Thermal Conductivity (K-value): 0.038 W/m·K
- Roll Length: 6000 mm
- Width: 600 mm (slit from 1200 mm)
- Density: 14 kg/m³
- Rolls per Pack: 2 rolls
- Coverage per Pack: approx. 7.2 m²
Typical Applications
51mm Cavitylite is suitable for:
- Long cavity walls in residential and commercial buildings
- Drywall partitions requiring light acoustic improvement
- Timber and steel frame interior walls
- Projects where fast coverage and fewer joins are preferred
- Entry-level insulation for internal partitions
Its roll format makes it ideal for installers wanting quick, continuous wall coverage without the frequent trimming required for batts.
Handling & Installation Notes
- Store rolls flat and protect from moisture before installation
- Allow roll to recover after opening the packaging
- Cut to length as needed using a sharp blade
- Fit snugly between studs with no compression or gaps
- Avoid excessive pressure on packaged rolls
- Trim neatly around electrical boxes, services or piping
A Fast, Cost-Effective Insulation Choice for Internal Walls
The 51mm Cavitylite roll provides quick installation, stable thermal performance and reliable acoustic absorption for modern drywall and cavity wall systems. Its long roll lengths and lightweight construction make it a practical choice for builders, contractors and homeowners requiring a cost-effective insulation solution that installs quickly and performs consistently.
Where to Go Next
Return to the Insulation Overview → Insulation Guide
Browse insulation by application → Insulation Applications
Explore insulation by brand → Brands
Browse all Cavitylite products → Cavitylite
View wall insulation options → Wall Insulation
Learn more about reducing noise → Soundproofing
Delivery Information
At Insulation Warehouse, we provide fast, reliable delivery across our service network so you get the insulation you need without delays. We are an online insulation store and do not operate as a walk-in retail outlet. All orders are placed online, processed immediately, and delivered directly to your home, site, or business.
Delivery Timeframes
- Most standard orders are delivered within 1–3 business days
- Fast dispatch from our storage facilities
- Orders are shipped as soon as payment is received
Specialized Product Lead Times
A few specialized or less common items may require additional preparation before dispatch. These can include:
- Industrial densities
- Custom-sized or made-to-order insulation
- Foil-faced products
- Commercial or non-standard rolls
When these items require extra time, we’ll let you know the expected delivery window.
Delivery Network
We deliver insulation products throughout:
- Johannesburg
- Centurion
- Pretoria
These areas form our primary delivery network, ensuring quick turnaround times for homeowners, installers, and contractors.
We can also deliver to surrounding suburbs — just send us your address if you’re unsure.
Delivery Process
- Orders leave our storage facility once paid for in full
- Delivery updates and timelines are provided
- Large orders may arrive on pallets to ensure product protection
Fast, Reliable Service
Our goal is to provide the quickest, most convenient delivery service possible. Whether you’re insulating a home, office, or development, our streamlined logistics ensure your materials arrive safely and on time.
