ISOVER GLASSWOOL WALL INSULATION
51mm Cavitylite Insulation For Walls
Tissue faced glasswool rolls for framed walls and drywall partitions. Each pack contains two roll sections measuring 6000 × 600 × 51mm, covering 7.2m² before cutting waste. The material R-value is 1.34 m²·K/W.
R-value
Product Overview
51mm Isover Cavitylite is lightweight glasswool insulation for drywall systems, timber frame buildings and steel frame structures. The rolls are glass tissue faced on one side for easier handling and improved rigidity.
Each pack contains a 1200mm-wide roll slit into two 600mm-wide sections, each 6000mm long. This provides 7.2m² of nominal pack coverage. The 51mm thickness has a material R-value of 1.34 m²·K/W. Allow for cutting waste when calculating your order.
Key Benefits
- 51mm glasswool wall insulation
- Material R-value: 1.34 m²·K/W
- 6000mm × 600mm roll sections
- Two roll sections per pack
- 7.2m² nominal coverage per pack
- Glass tissue facing on one side
- Non-combustible: SANS 428 A/A1/1
- Thermal and acoustic insulation for framed walls
Framed Wall Insulation
Designed to fit within suitable wall cavities for thermal insulation and sound absorption. Finished wall performance depends on the complete wall system.
Technical Product Data
51mm Cavitylite Technical Specifications
Product values from the Isover Cavitybatt / Cavitylite technical data sheet. Pack coverage is calculated from the roll section dimensions and quantity.
| Product range | Cavitylite |
|---|---|
| Product type | Wall Insulation |
| Material | Glasswool |
| Thickness | 51mm |
| Roll section length | 6000mm |
| Roll section width | 600mm (1200mm roll slit into two sections) |
| Area per section | 3.6m² |
| Roll sections per pack | 2 |
| Nominal pack coverage | 7.2m² before cutting waste |
| Material R-value | 1.34 m²·K/W |
| Thermal conductivity | 0.038 W/(m·K) |
| Nominal density | 14 kg/m³ |
| Facing | Glass tissue on one side |
| Packed dimensions | 1220 × 339mm (manufacturer-listed pack size) |
| SANS 428 fire classification | A/A1/1 |
| Combustibility | Non-combustible — tested to SANS 10177 Part 5 |
| Typical applications | Drywall systems, timber frame buildings and steel frame structures |
Wall Insulation Applications
Where Is 51mm Cavitylite Used?
Use within suitable drywall, timber frame and steel frame wall systems. Confirm the specified insulation thickness and the wall system requirements before ordering.
Drywall Systems
Fit within suitable stud cavities behind wall linings to provide thermal insulation and sound absorption.
View Wall Insulation →
Timber Frame Buildings
Use between timber framing where 51mm Cavitylite is specified. Fit around services and keep the insulation continuous.
View Cavitylite Range →
Steel Frame Structures
Use within suitable steel frame wall cavities as part of the specified thermal and acoustic wall construction.
View Glasswool Insulation →Installation Notes
51mm Cavitylite Installation Guidance
Follow the Isover instructions and the specified wall system details. These steps cover general fitting of the insulation within a suitable wall cavity.
Need 51mm Cavitylite Packs?
Tell us your wall area and required quantity. We can help estimate the number of packs and provide a supply quote for your project.
Request a Supply QuoteProduct Documentation
Cavitylite Technical Data Sheet
View the manufacturer’s product specifications, thermal properties, pack quantities, fire classification and installation guidance. The document covers Cavitybatt and Cavitylite; use the 51mm Cavitylite row for this product.
Isover Cavitybatt / Cavitylite Data Sheet
Technical information for the 51mm, 63mm and 102mm products, including dimensions, R-values and handling guidance.
51mm Cavitylite Information
Frequently Asked Questions
51mm Cavitylite has a material R-value of 1.34 m²·K/W. This describes the insulation itself; the overall wall performance depends on the complete construction.
One pack contains a 1200mm-wide roll slit into two 6000 × 600mm sections. Each section covers 3.6m², giving 7.2m² of nominal coverage per pack before cutting waste.
Cavitylite is designed for suitable drywall systems, timber frame buildings and steel frame structures. Check that the 51mm thickness matches the specified wall system.
The manufacturer lists Cavitylite as non-combustible, tested to SANS 10177 Part 5, with a SANS 428 classification of A/A1/1. This does not establish a fire resistance duration for the complete wall.
Select the thickness specified for the wall and avoid unnecessary compression. Allow the roll sections to recover after opening the pack, then cut them to suit the cavity and services.
The 51mm product has an R-value of R1.34 and covers 7.2m² per pack. The 63mm and 102mm products have R-values of R1.66 and R2.68 respectively. Each covers 6.48m² per pack from two 5400 × 600mm sections. Choose the thickness required by the wall design.
Need 51mm Cavitylite for Your Walls?
Tell us your wall area and the number of packs you need. We can help calculate coverage, confirm current pricing and stock, and quote for supply with collection or delivery options.