How and where to use guide
Ecotherm Rigid PIR Insulation 1200 x 2400 x 120mm
Typical applications and installation
This 120mm board is commonly used in floor insulation layers, cavity wall insulation, roof and loft upgrades, and thermal bridging solutions in both new build and retrofit projects. The 1200 x 2400mm format allows efficient coverage with minimal waste on standard building dimensions. Install boards in a continuous layer, ensuring tight joints between boards to maintain thermal performance. Boards can be mechanically fixed or adhered depending on the substrate and application. In floor applications, the 175 kPa compressive strength supports typical domestic and light commercial loading without crushing or settlement.
- Floor insulation: lay boards on prepared substrate, tape or seal joints to prevent air gaps
- Wall insulation: fit between studs or in cavity systems, ensuring boards are fully supported
- Roof and loft: lay boards across joists or rafters, maintaining ventilation where required by building regulations
- Retrofit upgrades: boards can be fitted internally or externally depending on wall construction and moisture risk
Handling and on-site storage
The lightweight rigid foam format makes this board easier to handle and manoeuvre than heavier mineral or glass fibre alternatives, reducing fatigue during installation. Store boards flat and dry on site, protected from weather and direct sunlight which can degrade the foam. Keep boards away from heat sources and naked flames. Handle with care to avoid punctures or compression damage that could compromise thermal performance. Ensure adequate workspace for cutting and fitting to avoid waste and maintain board integrity.
- Store flat on level ground, stacked no more than 4-5 boards high to prevent crushing
- Protect from rain and moisture during storage and installation
- Allow boards to acclimatise to site temperature before installation in cold weather
- Use sharp tools for cutting to avoid crushing foam edges
Cutting, fitting and finishing
Boards can be cut to size using a fine-toothed saw, hot wire cutter or specialist foam saw. Measure twice to minimise waste and ensure tight fit around obstacles. Seal all joints and edges with appropriate foam-compatible tape or sealant to prevent thermal bridging and air leakage. In applications where boards are exposed, apply a suitable fire-rated facing or protective layer as required by building regulations. The rigid format allows boards to be fitted without additional support in most applications, but always follow local building control guidance for your specific project.
- Cut boards cleanly to fit around pipes, cables and structural elements
- Seal joints with foam-compatible tape or expanding foam sealant
- Apply fire-rated facings or protective barriers where boards are exposed to occupied spaces
- Check building regulations for ventilation and moisture management requirements in your application
Limitations and maintenance
The 120mm thickness is suited to mid-range thermal requirements; thicker boards may be needed for higher performance targets or in exposed locations. PIR foam is not suitable for direct ground contact or prolonged water immersion. The material is combustible and must be protected by non-combustible facings or barriers in certain building applications. Once installed and sealed, the board requires minimal maintenance. Do not apply incompatible solvents or adhesives that may degrade the foam. In retrofit projects, ensure existing moisture issues are resolved before installation to prevent condensation and mould growth.
- Not suitable for direct ground contact or wet environments without protective barriers
- Requires fire-rated facing in certain applications under building regulations
- Incompatible with some adhesives and solvents; check product compatibility before use
- Ensure substrate is dry and moisture-free before installation to prevent thermal performance loss