Description
The Thin-R Plus PIR Full Fill Cavity Wall Insulation 90x450x1200mm 4pk is an enhanced PIR insulation board designed for use in full fill external masonry cavity wall applications while maintaining a 10mm residual cavity. Manufactured with a rigid modified polyisocyanurate (PIR) core and textured foil facings on both sides, it delivers an Agrément declared thermal conductivity of 0.021W/mK and features engineered shiplap jointing to help create a more continuous insulation layer and reduce thermal bridging.
Features & Benefits:
- Suitable for use as a full fill cavity wall solution (with a 10mm residual cavity).
- Improved lambda value of 0.021W/mK.
- Engineered shiplap jointing helps reduce thermal bridging and improve wall U-values.
- Textured foil facings on both sides for use in cavity wall applications.
- Euroclass E reaction to fire classification (Combustible).
- Provides excellent protection against wind-driven rain when installed with a 10mm residual cavity.
- Can achieve passive level U-values as low as 0.12W/m²K in traditional cavity widths up to 150mm (subject to build-up).
Applications:
- Full fill insulation in new external masonry cavity walls (with a 10mm residual cavity).
- Projects requiring improved thermal performance and reduced thermal bridging.
- Wall build-ups targeting low U-values, including passive-level performance (subject to design).
Technical Data:
- Range – Thin-R Plus
- Product Type – PIR Full Fill Cavity Wall Insulation
- Material – Modified Polyisocyanurate (PIR) core with textured foil facings
- Engineered Jointing – Shiplap
- Thermal Conductivity (Lambda) – 0.021W/mK
- Reaction to Fire – Euroclass E
- Compressive Strength – 120kPa
- Length – 1200mm
- Width – 450mm
- Thickness – 90mm
- Typical R-Value (90mm) – 4.25m²K/W
- Quantity in Pack – 4 Boards
Standards & Certifications:
- Standard – EN 13165:2012+A2:2016
- Certification – BBA Agrément Certificate 23/7059
Choose the Thin-R Plus PIR Full Fill Cavity Wall Insulation 90x450x1200mm 4pk for enhanced cavity wall thermal performance with engineered jointing and an improved lambda value, available now online or at our London shops.






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