125mm Sopratherm XR4125 PIR Insulation Board

125mm SOPRATHERM XR4125 PIR Insulation Board (formerly Celotex XR4000) is a premium polyisocyanurate rigid board engineered for superior thermal performance across diverse construction projects. Delivering a thermal conductivity of 0.022 W/mK, this board minimises heat transfer and enhances building energy efficiency significantly.

Manufactured by Soprema with low-emissivity aluminium foil facings on both sides, the 125mm SOPRATHERM insulation boards provide effective vapour management when installed correctly. BBA certified under Certificate 25/7318, this product is approved for:

1. Pitched roof insulation
2. Internal dry lining systems
3. Floor insulation

Pack Size & Coverage

1. Brand: Soprema
2. Product Range: SOPRATHERM XR4125 (formerly Celotex XR4000)
3. Thickness: 125mm
4. Dimensions: 2400 × 1200 mm
5. Board Length: 2400mm
6. Board Width: 1200mm
7. Board Coverage: 2.88m2
8. Pieces Per Pack: 1
9. Thermal Conductivity: 0.022W/mK
10. Thermal resistance (Rd): 5.65 m².K/W
11. Compressive Strength: 120 kPa
12. Density: 31kg/m3
13. Fire Rating: Euroclass F
14. Material: PIR
15. Finishing top: Alu-kraft
16. Finishing bottom: Alu-kraft
17. Edge Profile: Straight
18. Facing: Low Emissivity Foil
19. Aluminium foil surface emissivity: 0.05
20. Weight (kg/m2): 0.79kg/m2
21. BBA certified: Certificate 25/7318 (Pitched Roof, Dry Lining, Floor Insulation)

Sopratherm XR4125 Applications

This versatile 125mm insulation board suits numerous construction scenarios due to its adaptability and straightforward installation. Common applications include:

1. Concrete Slab (Ground Floor)
2. Suspended Timber Joist (Ground Floor)
3. Beam and Block (Ground Floor)
4. Upgrading Existing Concrete Slab (Ground Floor)
5. Timber Frame Internal Linings (External Wall)
6. Timber Frame Sheathing (External Wall)
7. Between Timber Frame Studs (External Wall)
8. Solid Masonry Internal Linings (External Wall)
9. Over Timber Rafters (Pitched Roof)
10. Sarking (Pitched Roof)
11. Below Timber Rafters (Pitched Roof)
12. Between Timber Rafters (Pitched Roof)
13. Loft Insulation – Between and Over Timber Joists (Pitched Roof)
14. Balconies & Terraces Over Joists (Flat Roof)
15. Between Timber Joists (Flat Roof)
16. Below Timber Joists (Flat Roof)

All listed applications comply with BBA Certificate 25/7318, validating the product's performance in approved construction systems when fitted according to manufacturer specifications.

Fire Performance

SOPRATHERM XR4125 achieves Euroclass F under BS EN 13501-1 fire classification standards.

Under current UK Building Regulations on combustibility, this product cannot be used in external walls of relevant buildings exceeding 11 metres in height.

Compliance and Installation

SOPRATHERM PIR insulation boards must be specified, installed and detailed in line with:

• UK Building Regulations
• Relevant statutory guidance
• Applicable British Standards
• The manufacturer's installation instructions

Proper specification and installation guarantee optimal insulation performance within the building structure and full regulatory compliance.

Info

Explore our complete Sopratherm Insulation range. We deliver throughout the UK Mainland. For product suitability advice on your project or bulk order quotations, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat - Lowest UK Insulation Prices near me.