Use a fine-toothed handsaw or a powered panel saw for quick, neat cuts. Hot-wire cutters also work well for factory or shop work. Keep edges tight and level where boards butt under the screed. Follow supplier guidance on managing debris.

To fit EPS 100 across a range of floor types: Clean the base and level it. Install a damp-proof or vapour-control layer if required by the floor construction. Lay your EPS100 boards, keeping them closely together. Trim neatly around edges or joists. For the topping: Under-screed floors: Add a slip layer and then pour the screed on top. Over-slab dry flooring: Install the chipboard or OSB on top of the EPS100 boards. Suspended timber floors: Place EPS 100 between joists or over decking, then top up with chipboard or engineered panels.

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EPS 100 keeps all the lightness and easy handling you get with lower kPa boards, but increases the compressive strength compared with lower-grade EPS boards. It gives the extra safety margin needed for floors with heavier furniture, denser screeds, or regular traffic.

What is expanded polystyrene 100?

EPS 100 is a medium-strength expanded polystyrene board, manufactured to EN 13163 and built for areas where loads are higher than typical domestic use. The “100” refers to its compressive strength class, meaning it achieves a compressive strength of approximately 100 kPa at 10% compression, which is a meaningful upgrade in stiffness and stability.

Because it maintains low weight and easy workability, it is widely used in mixed-load domestic ground floors to provide strength without sacrificing speed or cost efficiency.

What is EPS 100 kPa used for?

Jabfloor EPS 100 sits one step above the everyday domestic grade. It is the board for floors or floor finishes that normally receive regular traffic – busy family homes, garages with occasional vehicle movement, light commercial spaces, or ground floors where a firmer base is required. But it is not for full commercial warehouse traffic or heavy industrial use.

As a closed-cell expanded polystyrene, the EPS 100 insulation sheet combines predictable compression resistance with consistent thermal performance, so it is widely used:

Below screed
Under chipboard
In precast suspended slabs
In flat roofs, as part of a protected system – the board should not be exposed or used under heavy roof traffic.

Benefits of EPS 100 insulation

Higher compressive capacity. Expanded polystyrene insulation 100 is tested to a nominal compressive strength of approximately 100 kPa at 10% deformation – a real, measurable step up from EPS70 that reduces settlement and creep under load.
Thermal reliability. Typical declared lambda (thermal conductivity) values for EPS100 is around 0.036–0.037 W/m·K in manufacturer datasheets, so you get steady insulation performance across standard building temperatures.
Versatility for mixed use. EPS100 is a good compromise when you need more strength but still want the lightweight and on-site workability of EPS. It is common in domestic floors that will see heavier furniture, denser floor finishes, or intermittent wheeled loads.

Why choose our EPS 100 insulation sheet?

Here’s why you can trust EPS 100 insulation from Insulation Wholesale:

Our expanded polystyrene 100 boards are available in standard 2400 × 1200mm sheets across a wide thickness range.
Take advantage of our low prices to get predictable performance without the premium cost of specialist rigid foams.
Enjoy fast, UK-wide delivery on all orders.

At Insulation Wholesale, you can purchase EPS 100 at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.

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50mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)

50mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.

£164.16£196.99 Ex VATInc VAT
£4.75£5.70 Per M2
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