• How To Insulate A Garage

    | by Holly Wood

    Is your garage an underutilised, uncomfortable space that swings between freezing in winter and scorching in summer? Knowing how to insulate a garage can transform it into a comfortable and energy-efficient area. Insulating your garage not only keeps extreme temperatures at bay but also opens up a world of possibilities for its use.

    Whether you dream of a workshop or an extended living area, this comprehensive guide will walk you through every step. Together, we’ll explore various methods and materials to insulate your garage effectively

    Say goodbye to discomfort and skyrocketing energy bills, and hello to a cosy garage that adds value to your home.

    Understanding the Importance of Garage Insulation

    In the UK, a common problem with garages is their insufficient insulation. These structures often consist of breeze blocks, leaving them ill-equipped to retain warmth in the winter or maintain a cool environment during the summer months.

    Before we dive into the insulation methods, it’s essential to recognise the benefits of insulating your garage:

    1. Increased Energy Efficiency: Helps maintain a stable temperature and reduces the transfer of heat between the garage and the outdoors.
    2. Reduced Heating Bills: Properly insulating the garage door, walls, and roof ensures that heat stays inside during colder months. Minimising heat-transfer between the garage and the outside environment  reduces the workload on heating and cooling systems. Thus, leading to potential energy savings.
    3. Usable Living Space: With the right insulation, your garage can become a usable living space, making it more inviting and versatile for various activities.
    4. Protection of Belongings: Insulation protects your belongings, such as tools, equipment, and vehicles, from extreme temperatures and humidity, prolonging their lifespan.
    5. Moisture Control: Sufficient insulation can also act as a barrier against moisture and condensation. This helps prevent water damage and mould growth, keeping the garage and its contents safe.
    6. Noise Reduction: Insulation can help dampen external noises from entering the garage and vice versa, creating a quieter environment inside the space.

    Insulating the Garage Door, Walls, and Floor

    1. Garage Door Insulation: Insulating your garage door can make a massive difference in maintaining the garage’s temperature. You can use insulation kits specifically designed for garage doors, adding a thin layer of insulation directly to the door.
    2. Garage Wall Insulation: When insulating garage walls, consider the construction material. If you have cavity walls, cavity wall garage insulation using mineral wool or foam insulation can prevent heat transfer. For breeze block garage walls or external wall insulation, you can apply insulation directly to the walls using self-adhesive insulation boards.External wall insulation comes with a set of advantages. One such advantage is its ability to effectively maximise floor space while also offering essential weather-proofing for the walls.
    3. Garage Floor Insulation: Insulating the garage floor is essential, especially if there is a living space above the garage. Use underfloor insulation to prevent heat transfer between the garage and the upper living area, ensuring comfort and energy efficiency.

    Insulating the Garage Roof

    1. Flat Roof Insulation: For garages with flat roofs, you have two options: cold roof construction or warm roof construction. In cold roof construction, insulation is placed between the roof deck and the ceiling of the garage. For warm roof construction, the insulation is placed above the roof deck, providing better energy efficiency.
    2. Pitched Roof Insulation: For pitched roofs, you can install insulation directly under the roof deck or between the rafters, ensuring minimal heat transfer and increased thermal comfort.

    Choosing the Right Insulation Material

    1. Fibreglass Batts: Fibreglass batt insulation is a common and cost-effective option for garage insulation. It comes in rolls or batts, making it easy to install between studs and joists.
    2. Spray Foam: Spray foam insulation can seal gaps and cracks effectively, providing both insulation and air leakage prevention, making it suitable for various garage projects.
    3. Rigid Foam Insulation: Rigid insulation boards are ideal for insulating flat roofs and walls. They offer excellent thermal resistance, making them suitable for different applications, including garage walls and floors.

    Additional Tips for Effective Garage Insulation

    1. Vapour Barrier: Install a vapour barrier to prevent moisture from entering the insulated space, ensuring the longevity of the insulation.
    2. Air Gap: Leave a small air gap between the insulation and the roof or wall surface to promote ventilation and prevent condensation, particularly in cold roof construction.
    3. Installing Insulation: When installing insulation, ensure a proper fit and secure the insulation material in place using mechanical fixings to optimise its performance.

    DIY vs. Professional Installation

    Garage insulation can be a DIY project, but it’s essential to consider the complexity of the task and the specific needs of your garage.

    If you’re unsure about the insulation process or encounter challenging areas, consulting a professional may be the best approach to ensure proper insulation and compliance with building regulations.


    Insulating your garage is a worthwhile investment that can lead to energy savings, increased usable space, and protection for your belongings.

    Whether you opt for batt insulation, rigid foam, or spray foam, proper insulation can make a massive difference in the comfort and energy efficiency of your garage.

    Take the time to evaluate your garage’s specific needs, and don’t hesitate to seek professional advice if necessary.

    With the right insulation, you can transform your garage into a more functional and energy-efficient space, making it a valuable addition to your home.

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