45mm Unilin Thin-R PIR Rigid Insulation Board

Unilin Insulation (formerly Xtratherm) 45mm Thin-R PIR Board

45mm Unilin Thin-R Insulation Board (2400mm x 1200mm x 45mm) is a premium ultra-thin PIR rigid foil faced polyisocyanurate thermal foam solution delivering a certified thermal conductivity of 0.022 W/mK. Engineered for roofs, walls, floors, and timber and steel framed construction systems.

About

45mm Unilin PIR boards perform exceptionally on sloped roofs in ventilated, hybrid or warm configurations, offering outstanding U-values whilst preserving internal headroom. The roof envelope represents a major thermal weak point in any building structure and accounts for substantial heat loss. Deploying XT/PR-UF significantly cuts thermal losses and incorporates superior thermal bridging solutions. This 45mm board suits numerous construction scenarios including Pitched Roof Insulation, wall systems, and floor applications. The product combines a slim profile with lightweight handling and straightforward installation. Fire-resistant properties, moisture rejection, and minimal environmental footprint make this an intelligent choice for modern builds.

Product Details

Thickness : 45mm

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 : 2.05m2K/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 ǀ High-performance ǀ Rigid

Warm Roof insulation design represents an excellent approach for insulating complex roof structures. Positioning insulation above or between roof timbers maintains the structural envelope at internal temperatures, minimising thermal stress and condensation formation.

The 45mm PIR insulation requires storage on a clean, flat, elevated surface under weatherproof cover. Polythene wrapping alone does not provide sufficient outdoor protection. Careful handling during storage and on-site installation protects board integrity. The insulation boards cut cleanly with a sharp utility knife or fine-toothed saw.

Key Facts

1. Unilin 45mm PIR achieves an A+ rating under the BRE Green Guide.
2. Certified Lambda value of 0.022 W/mK.
3. Avoids Intrusion into Living Area
4. Reduced Risk of Condensation
5. Low Emissivity Foil Facings
6. Lightweight and Easy to Install
7. Reduced Thermal Bridging
8. Ventilated Roof
9. Warm Roof
10. Hybrid Roof

Browse our Unilin range and refine by thickness or coverage using the left-hand filters. For project suitability advice or bulk pricing enquiries, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Competitive UK Insulation Rates.