How and where to use guide
Rigid PIR Insulation 1200 x 2400 x 100mm
Typical applications
This PIR board is suitable for use in cavity walls, suspended timber floors, solid floors with appropriate damp-proof membranes, and pitched or flat roof constructions. The 100mm thickness fits standard cavity widths in modern building design and retrofit work. The boards are appropriate for both new build and refurbishment projects where thermal performance and moisture resistance are required.
- Cavity wall insulation in new build and retrofit applications
- Suspended timber floor insulation between joists
- Solid floor insulation with damp-proof protection
- Pitched roof insulation between rafters
- Flat roof insulation in warm roof constructions
Installation and handling
The 1200 x 2400mm sheet format simplifies handling and reduces on-site cutting waste. Boards should be stored flat and protected from weather and direct sunlight before installation. When installing in cavities, ensure boards are fitted snugly between structural elements and supported appropriately. In floor applications, boards must be laid over a suitable damp-proof membrane. In roof work, ensure adequate ventilation is maintained where required by building regulations. The moisture-resistant foam profile allows safe handling in damp conditions typical of construction sites.
- Store boards flat in a dry location away from direct sunlight
- Fit boards snugly within cavities to minimise thermal bridging
- Lay floor boards over damp-proof membranes to prevent moisture ingress
- Maintain required ventilation gaps in roof applications
- Use appropriate fixings or adhesives suitable for PIR foam
Performance and limitations
The thermal conductivity of 0.022 W/mK provides effective thermal insulation performance in standard building applications. Compressive strength of 175 kPa ensures the boards can support typical loads in floor and roof constructions without significant compression. PIR foam is moisture-resistant but not waterproof; in applications exposed to standing water or continuous moisture, additional protective measures such as damp-proof membranes or vapour barriers must be installed. The boards should not be used in applications requiring fire-rated insulation without verification of compliance with relevant building regulations.
- Thermal conductivity 0.022 W/mK suitable for standard cavity and floor applications
- Compressive strength 175 kPa adequate for typical residential loads
- Moisture-resistant but requires damp-proof protection in wet applications
- Verify fire performance compliance with building regulations before use
On-site tips and maintenance
Minimise waste by planning board layouts to suit cavity widths and joist spacing before cutting. Protect installed boards from damage during subsequent construction phases. Once installed and covered, PIR boards require no ongoing maintenance. Ensure all joints are properly sealed to prevent thermal bridging and maintain air tightness where required by building regulations. In refurbishment work, check existing cavities for debris or moisture before installing new boards.
- Plan layouts to minimise cutting and waste
- Protect boards from damage during construction
- Seal joints to maintain thermal and air performance
- Clear cavities of debris before installation in refurbishment work
- No maintenance required once installed and covered