Ursa 35 Cavity Insulation – All Thicknesses

URSA 35 Cavity Insulation – All Thicknesses

High-performance glass mineral wool batts for cavity wall systems

Product Overview

URSA 35 Cavity Insulation is a lightweight, semi-rigid glass mineral wool batt designed for use in both full-fill and partial-fill masonry cavity wall systems. With a declared thermal conductivity of 0.035 W/m·K, it offers excellent thermal and acoustic performance for both residential and commercial applications. Manufactured with up to 80% recycled glass, zero ozone depletion potential (ODP), and zero global warming potential (GWP) blowing agents, URSA 35 is an environmentally responsible and durable insulation solution that supports sustainable building design.

Key Features & Benefits

• Certified thermal conductivity of 0.035 W/m·K for high thermal efficiency.

• Non-combustible Euroclass A1 fire rating for maximum safety and compliance.

• Suitable for full-fill cavity walls up to 25 m high and partial-fill systems of any height.

• Excellent acoustic insulation helps reduce noise transmission and improve comfort.

• Vapour-permeable construction allows walls to breathe and manage moisture effectively.

• Easy to install, resilient slabs fit snugly between wall ties without gaps.

• Sustainably manufactured with up to 80% recycled glass and low-energy production methods.

Applications

• Full-fill cavity wall systems: Suitable for buildings up to 25 m in height.

• Partial-fill cavity wall systems: Ideal where a residual clear cavity is required for moisture protection (25 mm minimum, 50 mm preferred in exposed zones).

• Designed for new build and retrofit projects requiring improved thermal and acoustic performance.

Installation Guidance

• For full-fill, build the outer leaf with the first row of wall ties at approximately 600 mm centres and install URSA 35 batts as the wall progresses.

• For partial-fill, fix batts to the cavity face of the inner leaf using wall ties or retaining clips, maintaining a clear cavity and tightly butting joints.

• Keep cavities clear of mortar droppings and debris to maintain full thermal performance.

Specification at a Glance

• Thermal conductivity: 0.035 W/m·K

• Available thicknesses: 75 mm, 100 mm, 125 mm, 150 mm

• Batt size: 1350 mm × 455 mm

• Reaction to fire: Euroclass A1 (non-combustible)

• Product type: Glass Mineral Wool Batt

Why Choose URSA 35 from Pinks Insulation & Drylining?

At Pinks Insulation, we supply URSA 35 Cavity Insulation with fast UK-wide delivery and competitive trade pricing. Combining exceptional energy efficiency, acoustic comfort, and environmental responsibility, URSA 35 is a trusted choice for builders, contractors, and homeowners seeking reliable and high-performance cavity wall insulation.