Yes! EPS is one of the most popular materials for floor insulation in both new and renovated buildings. Its popularity comes from:
Excellent thermal insulation properties
High compressive strength (in floor-grade versions)
Ease of installation
Floor-grade EPS is specifically designed to withstand heavy loads and resist moisture, making it ideal for floors on the ground as well as in suspended floor systems. Properly installed, EPS reduces heat loss, dampens sound, and provides a stable base for underfloor heating and concrete screeds. Thickness can vary from 1 cm to 30 cm, depending on your project.
There are also different types of EPS designed for specific applications, which we’ll cover below.
Porous structure
Various densities and thermal conductivity values (lambda)
Suitable for standard residential floors and underfloor heating
Cost-effective and easy to handle
Closed-cell, dense structure
Very low water absorption and high compressive strength
Recommended for areas exposed to high loads and moisture (garages, bathrooms, kitchens, basements)
Higher price, but excellent long-term protection against thermal bridges
Choosing the right type depends on the floor location, expected loads, and moisture conditions.
To ensure effective floor insulation, EPS must meet stricter requirements than standard wall insulation:
High compressive strength: Supports concrete screeds, furniture, and occupants without deforming.
Low thermal conductivity (lambda): Lower lambda values (e.g., 0.031 W/mK for graphite EPS) improve insulation performance.
Moisture resistance: Critical for ground floors; XPS and specially treated EPS resist water absorption.
Dimensional stability and durability: Must retain shape and performance over time under varying temperature and humidity.
Correctly chosen EPS provides a comfortable, energy-efficient interior and reduces heat loss to the ground.
Compact the ground layer with sand and gravel for stability and drainage.
Lay a lean concrete layer (10–12 cm) to level the surface.
Install a moisture barrier (PE foil or bitumen layer) to protect EPS from rising damp.
Lay EPS boards (usually 10–15 cm thick). Boards can be staggered in two layers to avoid thermal bridges.
Cover with construction foil to prevent movement during pouring of concrete screed.
Pour the screed (4–5 cm) as the load-bearing layer for tiles, panels, or other flooring.
For underfloor heating, use high-density EPS to support pipes and screed without deformation.
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Even high-quality EPS won’t perform well if installed incorrectly:
Unprepared substrate: Loose sand, missing concrete, or uneven ground leads to settlement and cracking.
Missing or poorly installed moisture barrier: Damp reduces thermal efficiency.
Wrong EPS type or thickness: Using soft EPS instead of floor-grade or too thin insulation.
Boards not staggered: Creates linear thermal bridges.
Uneven or dirty surfaces: Prevents proper board contact.
Careful preparation and attention to detail are key to long-lasting floor insulation.
Reduces heat loss: Lower energy bills and warmer interiors.
Sound insulation: Dampens footsteps and vibrations.
Supports screeds and underfloor heating: Stable base for construction layers.
Versatile types: EPS for standard conditions, XPS for high loads or moisture-prone areas.
Cost-effective and long-lasting: One of the most practical insulation solutions for floors.
PUR/PIR foam: Excellent insulation in thinner layers, more expensive, requires specialist installation.
Expanded clay (lightweight aggregate): Used mainly in renovations, provides lightweight and breathable insulation.
Mineral wool: Less common for ground floors due to water absorption, suitable for suspended floors.
EPS remains the most popular and universal choice for most residential floor insulation projects.
Is EPS suitable for every building? Yes, if parameters are chosen correctly. XPS is better for high moisture or heavy loads.
Recommended thickness? Typically 10 cm minimum, up to 20 cm for energy-efficient homes.
Can EPS be used underfloor heating? Yes, but choose high-density EPS (EPS 100 or 150).
EPS or XPS? EPS for standard floors, XPS for moisture-prone or high-load areas.
Will it lower heating bills? Absolutely — reduces heat loss and improves comfort.
Can EPS be laid directly on the ground? No — a compacted sand layer, lean concrete, and moisture barrier are required first.
