• Insulating A House: Where, How & Why?

    | by Holly Wood

    As energy costs continue to rise, insulating your home has become more crucial than ever. Insulating a house is one of the best ways to make sure that the cool air outside stays outside and any heat generated remains inside, resulting in better energy efficiency and lower electricity bills down the line.

    In this comprehensive guide, we’ll explore various insulation methods, materials, and techniques to help you create a well-insulated and comfortable living space.

    Whether you have a new or existing house, these energy-saving measures can potentially save you money, save energy and reduce your carbon emissions.

    Understanding Different Types of Insulation

    Before delving into the various insulation methods, let’s familiarise ourselves with the different types of insulation materials available:

    1. Cavity Wall Insulation: Cavity walls have a gap (cavity) between the inner and outer layers. Insulating this cavity with materials like mineral wool or foam insulation can prevent heat transfer through the walls.
    2. Loft Insulation: The loft is one of the primary areas where heat escapes. Insulating it with mineral wool or rigid foam insulation boards can significantly reduce heat loss through the roof.
    3. Internal Wall Insulation: Insulating internal walls involves adding insulation material to the inside of external walls, helping to retain heat within the living spaces.
    4. Solid Wall Insulation: Solid walls lack a cavity and can be insulated externally with materials like rigid insulation boards or mineral wool insulation.
    5. Exterior Wall Insulation: Similar to solid wall insulation, this method, also referred to as external wall insulation, involves adding insulation to the exterior walls, improving energy efficiency.
    6. Floor Insulation: Insulating floors, especially on solid ground floors, helps prevent heat loss to the ground.
    7. Pipe Insulation: Insulating hot water pipes can conserve energy by reducing heat loss during water transfer.
    8. Roof Insulation: Roof insulation is crucial for preventing heat from escaping through the roof. It can be done using materials like mineral wool or rigid foam insulation boards, which are applied either between or below the roof rafters.

    Benefits of Insulating Your Home

    Insulating a house offers several significant benefits:

    • Reduced Heating Bills: Insulation minimises heat transfer, leading to lower heating costs and potential long-term savings.
    • Energy Efficiency: Insulated homes consume less energy to maintain comfortable temperatures, reducing their overall carbon footprint.
    • Increased Comfort: Insulation helps maintain a consistent and comfortable indoor temperature, eliminating cold spots and drafts.
    • Prevent Cold Air Infiltration: Insulation, along with draught-proofing measures, prevents cold air from entering the house.
    • Save Money: By saving energy, insulation helps homeowners save money on utility bills, which can accumulate substantial savings over time.

    Selecting the Right Insulation Material

    Choosing the correct insulation material when insulating a house is vital for optimal performance. Some common options include:

    1. Mineral Wool Insulation: Mineral wool is a popular and effective insulation material for cavity walls and lofts, as it’s non-combustible and provides excellent thermal insulation.
    2. Rigid Foam Insulation: Rigid insulation boards are ideal for insulating exterior walls and roofs, offering high thermal resistance in thin layers.
    3. Sheep’s Wool Insulation: Sheep’s wool is an eco-friendly alternative that provides excellent thermal and acoustic insulation properties.
    4. Reflective Foil Insulation: Reflective foil insulation and barriers can be used in various applications, reflecting heat to keep spaces warm.

    Insulating a House: Installation Techniques and Tips

    1. Cavity Wall Insulation: A professional can inject cavity wall insulation into the cavity, sealing it effectively.
    2. Loft Insulation: Lay loft insulation material evenly between joists, ensuring it covers the entire area and doesn’t block the loft hatch.
    3. Solid Wall Insulation: For external insulation, rigid insulation boards can be fixed to the walls, while internal wall insulation involves stud walls with insulation in between.
    4. Floor Insulation: Floor insulation can be placed between floor joists or under solid ground floors.
    5. Pipe Insulation: You can wrap pipe lagging, available in foam or other insulating materials, around hot water pipes.

    If you are looking for a more specific installation guide, take a look at our comprehensive blog hub where we cover topics such as how to install insulation and so much more. We also have a Celotex specific installation guide.

    Complementing Insulation with Other Energy-Saving Measures

    To maximise energy efficiency, consider these additional measures:

    1. Double Glazing: Install double glazing on windows to reduce heat loss through glass.
    2. Thermal Curtains: Hang thermal curtains to retain heat and reduce cold air infiltration.
    3. Draught-Proofing: Seal gaps around doors, windows, and pipes to prevent cold air from entering and warm air from escaping.
    4. Secondary Glazing: An alternative to double glazing, secondary glazing adds an extra layer of insulation to existing windows.
    5. Heat Pumps: Consider using heat pumps as an energy-efficient alternative to traditional heating systems.


    Insulating your home is a smart investment that pays off in the long run.

    By choosing the right insulation materials and methods for your property, you can significantly reduce heat loss, cut down on energy bills, and create a more comfortable and energy-efficient living space.

    Remember to follow local building regulations and seek professional advice when needed. By taking these energy-saving measures, you could save both money and the environment.

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