How and where to use guide

EUROWALL + PIR INSULATION FULL FILL CAVITY TONGUE & GROOVE 1200 X 460MM X 90MM

Suitable applications and wall types

These boards are engineered for full fill cavity wall insulation in new build and renovation projects. They work equally well in timber-framed construction (where they sit within the cavity between inner and outer leaf) and masonry cavity walls (brick, block, or stone). The 90mm thickness is designed to fit standard cavity widths without requiring additional packing or compression. Use these boards during the wall build process, installing them as the cavity is constructed rather than as a retrofit solution.

New build timber-framed walls with cavity construction
New build masonry cavity walls (brick outer leaf with block inner leaf)
Renovation projects where cavity walls are being rebuilt or extended
Standard cavity widths of approximately 90mm
Not suitable for narrow cavities or where cavity width is less than 85mm

Installation and on-site handling

Install boards as the wall is built, placing them horizontally or vertically within the cavity depending on your wall build sequence and preference. The tongue and groove edges must be engaged fully to create continuous insulation coverage and maintain the thermal performance. Ensure boards are pushed firmly into position so that the grooved edge of one board locks with the tongue of the adjacent board. The 1200 × 460mm board size is designed to minimise cutting and waste; plan your layout to take advantage of full board widths where possible. Handle boards carefully on site to avoid damage to the foam core or edge profiles, as damaged edges will compromise joint integrity.

Engage tongue and groove edges fully between adjacent boards
Install during wall construction, not as a retrofit
Push boards firmly into position to eliminate gaps
Minimise cutting to preserve board efficiency and reduce waste
Protect boards from weather and site damage during storage and installation
Do not compress or force boards into cavities narrower than specified

Thermal performance and limitations

The rigid PIR foam core delivers high thermal resistance suitable for meeting current Building Regulations insulation requirements in cavity wall construction. The tongue and groove profile is critical to performance—gaps between boards will create thermal bridges and reduce overall U-value. These boards are designed for full fill cavity installation only; they are not suitable for partial fill or blown-in applications. Performance depends on correct installation with no voids, gaps, or compression of the foam core.

Designed for full fill cavity systems only
Thermal performance depends on tight tongue and groove joints
Not suitable for partial fill or blown-in cavity insulation
Do not compress boards to fit narrower cavities
Ensure no voids or gaps remain between boards and cavity edges

Storage and site management

Store boards flat and dry on site, protected from weather, direct sunlight, and mechanical damage. Keep boards in their original packaging where possible until installation to prevent moisture absorption and edge damage. Stack boards carefully to avoid crushing the foam core or damaging the tongue and groove edges. Inspect boards before installation for any damage sustained during delivery or storage; damaged boards should not be installed as they will not achieve proper joint sealing.

Store flat and protected from rain and direct sunlight
Keep in original packaging until ready to install
Stack carefully to avoid crushing or edge damage
Inspect for damage before installation
Do not store in damp conditions or allow water contact