Cavitybatt Insulation – Cavity Wall Insulation

Cavitybatt Insulation is a premium glasswool product engineered for internal walls, dry walling systems, timber and steel frame structures. Designed to deliver both thermal insulation and sound control, it’s the ideal solution for modern energy-efficient buildings. With its rigid form and glass tissue facing, Cavitybatt is easy to install and ensures long-term performance across residential and commercial applications.

At Home Insulations, we supply and install Cavitybatt insulation across Johannesburg, Pretoria, Cape Town, Centurion, and Durban.

View our full list of insulation prices

Benefits of Cavitybatt Insulation

✅ Improved Energy Efficiency – Helps reduce indoor heat transfer, lowering energy costs
✅ Superior Acoustic Performance – Effectively absorbs sound between rooms and walls
✅ Non-Combustible – Rated A/A1/1 and meets strict South African fire regulations
✅ Moisture-Resistant – Will not absorb water or promote mould growth
✅ Durable and Rigid – Maintains shape and density in vertical installations
✅ Certified Safe – EUCEB certified and manufactured to ISO standards

Where Can Cavitybatt Be Installed?

• Between dry wall partitions
• Internal timber or steel framed walls
• Office and commercial partitions
• Multi-unit residential walls
• Healthcare and education facilities
• Anywhere improved fire, thermal, and acoustic insulation is needed

102mm Cavitybatt Wall Insulation

The 102mm Cavitybatt is a high-performance semi-rigid glasswool insulation slab designed for standard double-brick cavity wall insulation systems. Each slab measures 600mm x 1200mm, and packs offer 20 pieces per pack. Manufactured at a nominal density of 14 kg/m³, it delivers reliable thermal conductivity of 0.038 W/m·K, helping reduce heat gain and loss while maintaining consistent indoor temperatures throughout the year.

Product Specifications

• Brand: Isover
• Product Name: Cavitybatt
• Thickness: 102mm Cavitybatt
• Width: 600mm
• Length: 1200mm
• Pieces per Pack: 20
• Density: 14kg/m³
• R-value: 2.68
• K-value (W/m.K): 0.038 W/m.K
• Combustibility: Non-combustible (SANS 428 – Class A1)
• Application: External and internal masonry cavity walls

Key Benefits

✅ High thermal performance – improve energy efficiency year-round
✅ Excellent acoustic insulation – reduces airborne sound transmission
✅ Fire-rated – non-combustible for improved safety compliance
✅ Rigid batts – designed to fit securely in wall cavities
✅ Made from recycled glass – environmentally responsible insulation
✅ Moisture and pest resistant – will not rot or attract vermin

The 102mm Cavitybatt provides superior insulation performance and is especially suited for energy-efficient housing and commercial buildings. It is non-combustible, ensuring fire compliance, and made from recycled glasswool, making it a smart and sustainable choice for cavity wall insulation in South Africa’s demanding climate zones.

Read more on roof insulation materials

63mm Cavitybatt Wall Insulation

The 63mm Cavitybatt is a semi-rigid glasswool insulation slab designed specifically for narrow cavity wall insulation applications. With a thickness of 63mm, each slab measures 600mm x 1200mm, and packs offer 30 per pack. Manufactured to a nominal density of 14kg/m³, it delivers strong thermal conductivity of 0.038 W/m·K, helping homes and buildings reduce heat transfer and enhance indoor comfort year-round.

Product Specifications

• Brand: Isover
• Product Name: 63mm Cavitybatt
• Thickness: 63mm
• Width: 600mm
• Length: 1200mm
• Pieces per Pack: 30
• Nominal Density: 14 kg/m³
• R-value: 1.66
• K-value (W/m.K): 0.038 W/m·K
• Combustibility: Non-combustible (SANS 428 – Class A1)
• Application: Narrow cavity walls in residential or commercial buildings

Key Benefits

✅ Energy-efficient – helps reduce heating and cooling costs
✅ Slim profile – ideal for limited cavity wall spaces
✅ Non-combustible – complies with fire safety standards
✅ Great sound control – reduces room-to-room noise
✅ Eco-conscious – made from recycled glass materials
✅ Easy to install – rigid batts ensure snug fit in cavities

Thanks to its non-combustible fire rating (Class A1 under SANS 428) and rigid design, the 63mm Cavitybatt is ideal for fire-safe cavity wall insulation where space is limited. Whether for new builds or retrofits, it offers reliable thermal and acoustic performance, and its composition from recycled glass makes it an eco-friendly choice that aligns with sustainable building practices.

Read more on ceiling insulation products

51mm Cavitybatt Wall Insulation

The 51mm Cavitybatt is a slim-profile, semi-rigid glasswool slab designed for thermal and acoustic insulation within narrow cavity wall insulation systems. Each slab measures 600mm x 1200mm, with 40 pieces per pack. Manufactured at a nominal density of 14kg/m³, this product offers excellent thermal conductivity of 0.038 W/m·K, providing effective insulation without compromising wall space — ideal for renovations or buildings with thinner wall profiles.

Product Specifications

• Brand: Isover
• Product Name: 51mm Cavitybatt
• Thickness: 51mm
• Width: 600mm
• Length: 1200mm
• Pieces per Pack: 40
• Nominal Density: 14 kg/m³
• R-value: 1.34
• K-value (W/m.K): 0.038 W/m.K
• Combustibility: Non-combustible (SANS 428 – Class A1)
• Application: Insulation for narrow cavity walls in residential and commercial builds

Key Benefits

✅ Energy efficient – reduces heat transfer through external walls
✅ Fire-rated – non-combustible glasswool complies with SANS 428
✅ Slim design – ideal for narrow cavity wall applications
✅ Noise control – dampens external and internal sound transmission
✅ Lightweight and rigid – easy to install and cut to size
✅ Eco-conscious – manufactured using recycled glass materials

Despite its compact thickness, the 51mm Cavitybatt delivers reliable thermal resistance and soundproofing, making it a great choice for both retrofits and modern wall systems. Backed by high fire-safety standards and sustainable materials, it offers lasting performance in homes and commercial buildings across South Africa.

Why Choose Home Insulations?

We’ve supplied and installed thousands of square meters of Cavitybatt insulation across South Africa. Here’s why homeowners and contractors trust us:

✅ Over 30 years of ceiling insulation experience
✅ Friendly, trained installers
✅ Prompt delivery and professional installation
✅ Branches in Johannesburg, Centurion, Pretoria, Cape Town & Durban
✅ We only use genuine Isover Cavitybatt (no imitation products)

Explore our wall insulation and floor insulation options to complete your home’s thermal protection.

Frequently Asked Questions