125mm Ravatherm XPS 300 SB Extruded Polystyrene Board

125mm Ravatherm XPS 300 SB is a robust extruded polystyrene thermal insulation board featuring a butt-edge profile, engineered for challenging construction environments. This board achieves outstanding thermal performance with a thermal conductivity rating of 0.030 W/mK for thicknesses up to 120mm, and 0.031 W/mK above this threshold, supporting compliance with current UK Building Regulations and energy performance standards.

Produced with environmental considerations, 125mm Ravatherm 300 SB carries a Global Warming Potential (GWP) of less than 5, positioning it as a sustainable insulation solution.

Its exceptionally low water absorption characteristics, verified to BS EN 12087:2013 standards, make this extruded polystyrene board particularly suited for below DPC cavity wall insulation and other applications requiring moisture resistance.

Available in thicknesses ranging from 30mm to 200mm, 125mm Ravatherm XPS 300 SB boards provide adaptability across diverse UK residential and commercial building projects.

Key Benefits

• Thickness: 125mm
• Board Length: 2500mm
• Board Width: 600mm
• Pack Quantity: 3
• Board Coverage: 1.5m2
• Pack Coverage: 4.50m2
• Thermal Conductivity: 0.030W/mK
• R-Value: 4m2K/W
• Compressive strength@ 10% deformation: 300kPa
• Compressive Creep max after 50 years < 2% deformation under stress σC: 130kPa
• Fire Rating (Reaction to Fire): E
• Water vapour diffusion resistance factor μ (tabulated value): 100
• Temperature limits: -50/+75
• Edge Profile: Butt Edge
• Surface finish: Skin

Application

• Ground bearing floor below screed
• Ground bearing floor below concrete slab
• Basement floors and retaining walls
• Suspended floor
• Swimming pool

Features

1. Homogeneous, closed-cell material structure
2. Permanently high thermal insulation level
3. Negligible moisture uptake
4. High strength, rigidity and dimensional stability
5. Water and frost resistance
6. High compressive strength
7. High vapour diffusion resistance
8. Resistance to rot and deterioration
9. Simple and quick installation

Info

Browse our complete range of Ravatherm Extruded Polystyrene Insulation products. We deliver throughout the UK Mainland. For product suitability advice, project-specific recommendations, or bulk pricing enquiries, contact us on 02038839057 / 02038839057, email sales@insulationbee.co.uk or use Live Chat.