Fixing and buying guide
EUROWALL + PIR INSULATION FULL FILL CAVITY TONGUE & GROOVE 1200 X 460MM X 90MM
Who these boards are for and what they do
EUROWALL + PIR boards suit builders and serious DIY installers undertaking cavity wall insulation in new build or renovation projects. They are suitable for both timber-framed construction and masonry cavity walls where a full fill insulation approach is required. The boards provide consistent thermal resistance throughout the cavity, eliminating cold bridges and reducing heat loss. The tongue and groove edge profile ensures joints remain tight, preventing thermal bridging and air infiltration at board edges.
- Full fill cavity system — insulates the entire cavity width
- Suitable for timber-framed and masonry cavity walls
- Tongue and groove edges create secure, airtight joints
- PIR foam core delivers reliable thermal performance
Sizing and coverage
Each board measures 1200mm long by 460mm wide by 90mm thick. The 90mm thickness is designed to fit standard cavity widths in modern construction. The board dimensions are optimised to cover wall areas efficiently with minimal waste. Calculate your cavity wall area in square metres, then divide by the coverage per board (0.552 square metres per board) to determine quantity needed. Account for any openings such as windows and doors, and add approximately 5 percent for cutting and fitting around edges and penetrations.
- Board dimensions: 1200 × 460 × 90mm
- Coverage per board: 0.552 square metres
- 90mm thickness suits standard cavity widths
- Minimised cutting required due to optimised board size
Installation and fixing
EUROWALL + PIR boards are installed as a full fill system, meaning they occupy the entire cavity width. Boards are positioned vertically or horizontally depending on cavity layout and structural requirements. The tongue and groove edges interlock to form continuous joints with minimal gaps. Boards are typically secured using cavity wall ties or mechanical fixings appropriate to your wall construction type. Ensure cavity is clean and free from debris before installation. Work systematically across the wall, engaging tongue and groove edges fully to maintain thermal continuity. Do not compress the foam excessively during fitting.
- Install as full fill cavity system across entire cavity width
- Engage tongue and groove edges fully to eliminate gaps
- Secure using appropriate cavity wall ties or fixings
- Clean cavity before installation to ensure proper contact
- Avoid excessive compression of foam during fitting
Pre-installation checks and compatibility
Before ordering, confirm your cavity width accommodates 90mm thickness boards. Verify that your wall construction is suitable for full fill cavity insulation — check building regulations and structural specifications for your project. Inspect the cavity for moisture, debris, or existing obstructions that must be cleared. Ensure you have appropriate fixings and cavity wall ties for your wall type. Check that boards will be protected from weather during storage and installation. Confirm that your project complies with current Building Regulations thermal performance requirements.
- Confirm cavity width is suitable for 90mm thickness
- Check Building Regulations compliance for your application
- Inspect cavity for moisture, debris, and obstructions
- Obtain appropriate fixings and cavity wall ties in advance
- Protect boards from weather during storage and installation