Product Description

The 125mm Polystyrene Insulation Board is a high-performance, cost-effective insulation solution ideal for a wide range of building applications. Made from 98% air and just 2% plastic, this expanded polystyrene board features a closed-cell structure that delivers excellent compressive strength (70kPa), moisture resistance, and thermal performance (? = 0.038 W/mK).
Designed for use in floors, walls, roofs, and under screeds, this lightweight board is easy to cut, handle, and install—making it a popular choice for contractors, specifiers, and DIYers alike. Whether insulating a domestic floor, loft, or cavity wall, EPS70 offers long-lasting performance without the risk of rot, mould, or degradation.
With dimensions of 2400 x 1200mm and a 125mm thickness, it offers wide coverage and consistent thermal insulation. EPS boards are compatible with masonry and timber substrates, and are ideal for use beneath concrete slabs, between joists, or in suspended floor systems.

Key Features & Benefits:

• Lightweight & easy to install – ideal for fast handling on-site
• High compressive strength (70kPa) – suitable for floor insulation
• Thermal conductivity: 0.038 W/mK – supports energy efficiency
• Moisture & rot resistant – perfect for damp environments
• Versatile application – suitable for floors, roofs, walls & lofts
• Non-toxic & chemically inert – no protective gear required
• A+ rating in BRE Green Guide – supports sustainable construction

Product Specs:

• Size: 2400mm x 1200mm
• Thickness: 125mm
• Compressive Strength: 70kPa
• Thermal Conductivity: 0.038 W/mK
• Material: Expanded Polystyrene (EPS)
• Use Areas: Floors, walls, lofts, roofs, screeds, and more

Installation Tip:

For best results, apply using a dual fixing method (adhesive and mechanical fixings). Boards can be cut cleanly using a hot wire cutter, handsaw, or utility knife.

Storage Advice:

Store indoors or under cover in dry, well-ventilated conditions.