ISOVER GLASSWOOL WALL INSULATION
51mm Cavitybatt Insulation For Walls
Tissue-faced glasswool batts for framed walls and drywall partitions. Each pack contains 40 batts measuring 1200 × 600 × 51mm, covering 28.8m² before cutting waste. The material R-value is 1.34 m²·K/W.
R-value
Product Overview
51mm Isover Cavitybatt is lightweight glasswool insulation for drywall systems, timber frame buildings and steel frame structures. The batts are glass tissue faced on one side for easier handling and improved rigidity.
Each pack contains 40 batts measuring 1200mm × 600mm, providing 28.8m² of nominal coverage. The 51mm thickness has a material R-value of R1.34m²·K/W. Allow for cutting waste when calculating your order.
Key Benefits
- 51mm glasswool wall insulation
- Material R-value: R1.34m²·K/W
- 1200mm × 600mm batts
- 40 batts per pack
- 28.8m² 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 Cavitybatt Technical Specifications
Product values from the Isover Cavitybatt / Cavitylite technical data sheet. Pack coverage is calculated from the batt dimensions and quantity.
| Product range | Cavitybatt |
|---|---|
| Product type | Wall Insulation |
| Material | Glasswool |
| Thickness | 51mm |
| Batt length | 1200mm |
| Batt width | 600mm |
| Area per batt | 0.72m² |
| Batts per pack | 40 |
| Nominal pack coverage | 28.8m² before cutting waste |
| Material R-value | R1.34m²·K/W |
| Thermal conductivity | 0.038W/m·K |
| Nominal density | 14kg/m³ |
| Facing | Glass tissue on one side |
| Packed dimensions | 1210mm × 610mm × 460mm |
| 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 Cavitybatt 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 Cavitybatt is specified. Fit around services and keep the insulation continuous.
View Cavitybatt 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 Cavitybatt 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 Cavitybatt 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
Cavitybatt 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 Cavitybatt 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 Cavitybatt Information
Frequently Asked Questions
51mm Cavitybatt has a material R-value of R1.34m²·K/W. This describes the insulation itself; the overall wall performance depends on the complete construction.
One pack contains 40 batts measuring 1200mm × 600mm. Each batt covers 0.72m², giving 28.8m² of nominal coverage per pack before cutting waste.
Cavitybatt 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 Cavitybatt 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 batts 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 28.8m² per pack. The 63mm product has an R-value of R1.66 and covers 21.6m²; the 102mm product has an R-value of R2.68 and covers 14.4m². Choose the thickness required by the wall design.
Need 51mm Cavitybatt 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.