120mm Unilin Thin-R PIR Insulation Board

Unilin Insulation (formerly Xtratherm) Thin-R PIR

120mm Unilin Thin-R Insulation Board (2400mm x 1200mm x 120mm) is a high-performance PIR rigid foil faced polyisocyanurate thermal foam insulation board with an exceptionally low thermal conductivity of 0.022 W/mK. Ideal for pitched roofs, walls, floors, and timber or steel framed construction systems.

About

120mm Unilin PIR delivers outstanding thermal performance on sloped roofs in ventilated, hybrid, or warm roof configurations. Pitched roof construction demands superior insulation to minimise heat loss and maintain structural integrity. This board reduces thermal bridging whilst maintaining excellent U-values without compromising internal space. The roof is a critical thermal boundary where significant energy loss occurs. Unilin Thin-R addresses this challenge with reliable thermal bridging solutions. Suitable for multiple construction methods including pitched roof insulation, walls, and floors, this board combines lightweight construction with straightforward installation. Fire-resistant properties, water-repellent characteristics, and low environmental impact make it an excellent choice for sustainable building projects.

Product Details

Thickness: 120mm

Length: 2400mm

Width: 1200mm

Overall Thickness: 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 60mm, 65mm, 70mm, 75mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 165mm

Maximum board weight: 0.45 kg/m²

Thermal Resistance: 5.45 m²K/W

Thermal conductivity: 0.022 W/mK

Compressive strength: >150 kPa

Water Vapour Resistivity: >100 MNs/gm

Density (Foam Core): 30-32 kg/m³

Surface spread of flame: Class 1

Reaction to fire: E

Finish: Aluminium Foil Facings

Applications: Roofs, Walls, Floors, Timber & Steel Frame

ETA Notification: Yes

Features: Versatile | High-performance | Rigid

Warm roof insulation construction offers an effective solution for complex roof designs. Positioning insulation above or between roof timbers maintains the structure at internal environmental conditions, reducing thermal stress and condensation risk.

Store 120mm PIR insulation boards off the ground on a clean, flat, covered surface. Polythene wrapping alone does not provide adequate outdoor protection. Ensure proper protection during storage and on-site handling. Insulation boards can be cut easily with a sharp knife or fine-toothed saw.

Key Facts

1. Unilin 120mm PIR achieves an A+ rating under the BRE Green Guide
2. Certified Lambda value of 0.022 W/mK
3. Minimises intrusion into usable living space
4. Condensation risk significantly reduced
5. Low Emissivity Foil Facings
6. Lightweight and simple to install
7. Thermal bridging substantially reduced
8. Suitable for ventilated roof applications
9. Suitable for warm roof applications
10. Suitable for hybrid roof applications

Browse our Unilin range and filter by thickness or coverage using the left-hand menu. For project-specific advice, suitability assessments, or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for competitive UK Insulation pricing.