Cavity Batts

(17)

Superglass Superwall 36 100mm Cavity Slabs (4.37m per pack)

£28.65

URSA 35 100mm Cavity Insulation Batt (3.69m per pack)

£33.25

URSA 32 100mm Cavity Insulation Batt (3.07m per pack)

£37.95

Superglass Superwall 36 150mm Cavity Slabs (3.28m per pack)

£35.80

URSA 32 150mm Cavity Insulation Batt (2.46m per pack)

£44.71

URSA 35 75mm Cavity Insulation Batt (4.91m per pack)

£36.95

Superglass Superwall 32 150mm Cavity Slabs (2.18m per pack)

£39.75

Superglass Superwall 32 100mm Cavity Slabs (3.28m per pack)

£40.61

Superglass Superwall 36 75mm Cavity Slabs (5.46m per pack)

£29.57

URSA 32 75mm Cavity Insulation Batt (4.3m per pack)

£42.39

URSA 35 125mm Cavity Insulation Batt (3.07m per pack)

£39.50

URSA 32 85mm Cavity Insulation Batt (3.69m per pack)

£40.95

URSA 32 125mm Cavity Insulation Batt (2.46m per pack)

£38.15

Superglass Superwall 32 125mm Cavity Slabs (2.18m per pack)

£33.95

Superglass Superwall 32 75mm Cavity Slabs (4.37m per pack)

£43.20

Superglass Superwall 36 85mm Cavity Slabs (4.37m per pack)

£36.01

Superglass Superwall 36 125mm Cavity Slabs (3.28m per pack)

£32.35

Cavity Batts Insulation for Walls

Cavity batts are designed to fit neatly within wall cavities, providing excellent thermal insulation and improving energy efficiency in both new build and renovation projects. At Cut Price Insulation, we supply premium cavity batts from trusted brands: URSA and Superglass. These products are lightweight, easy to install, and deliver high-performance insulation for a comfortable, energy-efficient home.

Understanding Performance Grades (36, 35, 32)

Cavity batts are available in different performance grades, commonly 36, 35, and 32. These numbers indicate the thermal conductivity of the insulation material, measured in W/m·K. A higher grade (e.g., 36) provides slightly lower thermal resistance compared to a lower grade (e.g., 32), meaning lower numbers generally indicate better insulating performance. Choosing the right grade and thickness helps achieve target U-values for walls and ensures your building meets energy efficiency standards.

Available Thicknesses & Performance Grades

Brand	Thickness (mm)	Performance Grade	Best For	Key Advantage
Superglass	75, 85, 100, 125, 150	32	High-performance new builds & refurbishments	Lowest thermal conductivity; recycled glass; premium eco credentials
URSA	75, 85, 100, 125, 150	35, 32	Mid-to premium cavity wall systems	High density, trusted brand, versatile thicknesses

Premium 32 Grade 150mm Cavity Batts

The 32 grade 150 mm cavity batt represents one of the most effective insulation solutions available for external masonry cavity walls. With a declared thermal conductivity (λ-value) of just 0.032 W/m·K, this grade offers superior resistance to heat flow and helps meet stringent building regulations for U-values in both new builds and retrofit works. Both the Superglass Superwall 32 and the URSA 32 cavity batt at 150 mm thickness are non-combustible glass mineral wool products suitable for full-fill cavity wall systems, offering excellent thermal and acoustic performance.

At 150 mm thickness, the batt provides generous coverage across standard cavities, reducing on-site cutting and installation time. The low λ-value combined with extra thickness ensures reduced heat loss, improved energy efficiency, and enhanced internal comfort. Selecting the 32 grade over higher grades such as 35 allows for higher thermal performance per millimeter, helping to achieve required U-values with less wall space.

Correct installation is essential: the batt should fit snugly without compression, maintaining a continuous insulation layer to minimise thermal bridging and air leakage. Both Superglass and URSA variants also provide excellent fire safety (Euroclass A1) and are manufactured with substantial recycled glass content, supporting sustainable construction practices. Choosing a 150 mm thickness 32 grade batt is ideal for homeowners and contractors aiming for long-term energy efficiency, acoustic comfort, and compliance with building regulations.

Recommended Applications

External walls: Install within cavity walls for maximum energy efficiency.

New builds & renovations: Perfect for meeting building regulations and U-value targets.

Eco-friendly construction: Reduce heating costs and carbon footprint.

Installation Guidance

Ensure the cavity batt fits snugly between the wall studs or blocks without gaps or compression. Use the correct thickness and performance grade to achieve target U-values. Avoid leaving voids and maintain continuous insulation for optimal thermal performance.

Benefits of Cavity Batts

Energy efficiency: Reduces heat loss and lowers heating bills.

Fire protection: Non-combustible materials provide additional safety.

Easy installation: Lightweight, flexible, and simple to cut for a perfect fit.

Eco-friendly: Made from recycled glass wool, sustainable manufacturing.