Soprema SOPRAXPS 300 SL FN 120mm XPS Board

120mm Soprema SOPRAXPS 300 SL FN is a premium rigid extruded polystyrene (XPS) insulation board engineered for demanding UK construction projects requiring superior compressive strength and water resistance. Delivering 300kPa compressive strength, it provides robust thermal insulation performance in heavy-load applications.

Manufactured to 1250mm x 600mm x 120mm dimensions, Soprema XPS 300 SL suits commercial, industrial and specialist construction environments. Typical uses encompass solid floors, underground structures, basements, car parks, swimming pools, cold storage, and both flat and pitched roof systems.

Compared to standard EPS (expanded polystyrene) insulation, which typically delivers around 70kPa compressive strength, Soprema SOPRAXPS 300 SL FN offers substantially superior load-bearing capability. This makes it particularly suited to high-traffic zones and structural applications where durability and performance matter.

Key Benefits

1. Brand: Soprema SOPRAXPS 300 SL FN (Previously Soprema SL)
2. Model: 120mm XPS 300
3. Thickness: 120mm
4. Weight: 12.00kg
5. Dimensions: 1,250mm x 600mm x 120mm
6. Board Length: 1250mm
7. Board Width: 600mm
8. Pack of: 3
9. Board Coverage: 0.75m2
10. Pack Coverage: 2.3m2
11. Density: 35kg/m3
12. R-Value: 3.75m2K/W
13. Thermal Conductivity: 0.032 W/mK
14. Compressive Strength: 300kPa
15. Material: Extruded Polystyrene
16. Edge Profile: Rebated edge
17. Surface: Smooth
18. Reacting to fire: F
19. Applications: Garage, Car parks, Roof, Floor, Basement
20. Features: High quality ǀ Waterproof ǀ Rigid XPS
21. Manufacturer: SOPREMA

Key Features

• Moisture-Resistant
• Shiplap (SL) Edges
• High Compressive Strength
• Closed-Cell XPS Foam Core

The rebated edge profile enhances thermal continuity and minimises cold bridging. Its closed-cell XPS structure delivers excellent water, moisture and frost resistance, maintaining consistent thermal performance in damp or subterranean conditions. 120mm Soprema XPS insulation is manufactured using climate-friendly CO₂ technology, supporting sustainable UK construction practices.

For inverted roof applications, including zero-fall and flat roofs, 120mm Soprema SOPRAXPS must be installed with ballast to guarantee stability and long-term durability.

Meeting modern UK building regulations, 120mm Soprema SOPRAXPS 300 SL FN insulation boards deliver exceptional strength, longevity and thermal performance across diverse construction and civil engineering projects.

Info

Browse our full range of Soprema XPS Insulation products. We deliver across the entire UK Mainland. For product suitability advice on your project or bulk pricing enquiries, contact us on 02038839057 / 02038839057, email sales@insulationbee.co.uk or use Live Chat - Lowest UK Insulation Prices near me.