• How to Install EPS Insulation Foam Board

    | by Holly Wood

    In this comprehensive guide, we delve into the art of how to install EPS insulation foam board. Whether you’re a seasoned DIY enthusiast or just embarking on your home improvement journey, this guide is your roadmap to success.

    We will discuss the fundamentals and equip you with the knowledge and confidence needed to make your home more comfortable.

    Let’s begin!

    Understanding EPS Insulation Foam Board

    Before you dive into the installation process, it’s essential to have a solid understanding of what EPS is.

    EPS is a thermoplastic material that is commonly available in the form of a rigid foam insulation board or as loose beads. In this guide, we will discuss how to install EPS rigid foam board.

    EPS foam boards are made from expanded polystyrene, a closed-cell foam material. EPS insulation boards come in various thicknesses and are often used as continuous insulation for exterior walls, providing an effective barrier against heat transfer.

    Conveniently, EPS insulation foam boards are rot-proof and have a long lifespan, providing lasting insulation for your building structure.

    Choosing the Right EPS Insulation Boards

    Selecting the appropriate EPS insulation boards is crucial to achieving optimal thermal performance.

    Consider factors such as the thickness of the boards, the specific R-value required for your project, and whether you need foil-facing outward for radiant barrier properties.

    Refer to the manufacturer’s instructions and consult with building professionals to make an informed decision.

    Preparing Your Surface

    Before installing EPS insulation board, ensure that the surface, typically a concrete wall, is clean, dry, and free from any debris or moisture buildup.

    Any irregularities on the surface should be addressed, and any existing insulation, such as fibreglass or other insulation materials, should be removed.

    How to Install EPS Insulation Foam Boards

    1. Measure and Cut: Measure the dimensions of the wall and cut the EPS insulation boards accordingly, leaving a small gap for expansion during temperature changes.
    2. Apply Adhesive: Use a suitable adhesive designed for foam board insulation to apply a uniform layer on the back of each board.
    3. Position and Secure: Press the EPS boards firmly onto the prepared surface, ensuring a snug fit. Use mechanical fixings, such as screws or nails, to secure the boards to the wall. This is especially important in areas where wind loads or other forces may affect the insulation’s stability.
    4. Seal Joints: Seal any gaps or joints between the boards with expanding foam to prevent air infiltration and heat loss.
    5. Radiant Barrier: If required, ensure that the foil facing is outward to act as a radiant barrier.

    Additional Considerations

    • For exterior walls with wood studs, make sure to insulate between the studs and cover them with EPS insulation boards.
    • Below-grade installations, such as basement walls, may require special attention to ensure water resistance and prevent moisture buildup.
    • Regularly inspect the insulation to check for any signs of damage, mould growth, or degradation in insulation performance.


    Remember, the key to success lies in meticulous planning, precise execution, and a commitment to quality. Take your time, follow the steps we’ve outlined, and don’t hesitate to seek professional guidance if needed.

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