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100mm Insulation vs. 50mm Insulation vs. 25mm Insulation: Which is Right for You?


Insulating your home or office is essential for maintaining a comfortable indoor environment and reducing energy costs. Choosing the right insulation thickness is a crucial decision that can impact your building’s energy efficiency. In this article, we will delve deeper into the benefits and applications of three popular insulation options: 100mm insulation, 50mm insulation, and 25mm insulation. Understanding their unique features will help you make an informed decision that best suits your insulation needs.

  1. 100mm Insulation: The Ultimate Thermal Efficiency

When it comes to achieving optimal thermal efficiency and energy savings, 100mm insulation stands out as a superior choice. With double the thickness of 50mm insulation and quadruple the thickness of 25mm insulation, it provides an excellent barrier against heat transfer. Here are the key benefits of 100mm insulation:

a) Enhanced energy efficiency: The increased thickness of 100mm insulation significantly reduces heat loss during winters and prevents heat gain during summers. This results in a stable indoor temperature, reducing the need for excessive heating or cooling and ultimately lowering energy bills.

b) Superior sound insulation: In addition to its excellent thermal properties, thicker insulation contributes to improved soundproofing. It effectively minimizes noise transmission from outside and between rooms, creating a quieter and more peaceful environment.

c) Increased condensation control: The thicker insulation of 100mm helps regulate the temperature of your walls, ceilings, and windows, reducing the risk of condensation formation. By minimizing moisture-related issues, it helps maintain a healthier indoor environment.

  1. 50mm Insulation: A Balanced Approach

In situations where space constraints or budget considerations play a role, 50mm insulation offers a balanced solution. It provides notable insulation benefits without requiring extensive alterations to existing structures. Consider the advantages of 50mm insulation:

a) Adequate thermal resistance: While not as thick as 100mm insulation, 50mm insulation still offers a reasonable level of thermal resistance. It effectively reduces heat transfer and helps maintain a comfortable indoor environment.

b) Flexibility and adaptability: The thinner profile of 50mm insulation makes it a versatile choice for various spaces. It can be easily installed in retrofitting projects or areas where limited space is available. Its adaptability makes it suitable for both residential and commercial applications.

c) Cost-effective solution: 50mm insulation typically comes at a lower price point compared to 100mm insulation. It provides cost savings while still delivering significant energy efficiency benefits. If you are working within a tighter budget, 50mm insulation can be a cost-effective option.

  1. 25mm Insulation: Space-Conscious Efficiency

For spaces with limited room or insulation needs that are not as demanding, 25mm insulation offers a practical solution. While it may not provide the same level of thermal resistance as thicker options, it can still offer notable benefits in specific scenarios. Consider the advantages of 25mm insulation:

a) Suitable for thin walls or tight spaces: In buildings with thin walls or limited space for insulation, 25mm insulation can provide an extra layer of thermal resistance. It helps improve energy efficiency without compromising the available area.

b) Quick and easy installation: The thinner profile of 25mm insulation makes it easier and faster to install. This is particularly beneficial for smaller projects or areas that require a quick insulation solution.

c) Cost-effective for minor insulation needs: If you have specific areas in your building that require a boost in insulation performance, such as around windows or doors, 25mm insulation can provide a costeffective solution. It allows you to address insulation needs in targeted areas without the need for extensive insulation upgrades.

Choosing the Right Insulation Thickness

Selecting the appropriate insulation thickness depends on various factors, including your climate, building type, energy-efficiency goals, and budget. To make an informed decision, it’s crucial to consult with insulation professionals who can assess your specific needs and recommend the most suitable option. Here are a few additional factors to consider:

  1. Climate: If you live in an area with extreme temperatures, such as very cold winters or scorching summers, thicker insulation like 100mm may be more beneficial. It provides greater thermal resistance and helps create a more comfortable indoor environment.
  2. Building type: The insulation requirements for residential buildings may differ from those of commercial buildings. Factors such as building materials, construction techniques, and usage patterns can influence the insulation thickness needed.
  3. Energy-efficiency goals: Consider your long-term energy-saving goals. Thicker insulation generally offers better energy efficiency, resulting in greater cost savings over time. However, if your primary goal is to address specific areas or spaces, thinner insulation options like 50mm or 25mm may suffice.
  4. Budget: Your budget plays a significant role in determining the insulation thickness you can afford. While thicker insulation provides greater benefits, it also comes at a higher cost. It’s essential to find the right balance between energy efficiency and budget considerations.


Insulation is a critical component of any building’s energy efficiency strategy. When deciding between 100mm insulation, 50mm insulation, or 25mm insulation, it’s important to evaluate your specific needs, budget, and goals. While 100mm insulation offers superior thermal resistance and energy savings, 50mm insulation strikes a balance between performance and affordability. On the other hand, 25mm insulation provides a cost-effective solution for targeted areas or spaces with limited room.

To ensure you make the right choice, consult with insulation professionals like Envirosmart Limited. They can assess your building’s requirements and recommend the most suitable insulation thickness for maximum energy efficiency, comfort, and cost savings. Remember, investing in proper insulation will pay off in the long run by creating a more sustainable and comfortable environment for years to come.

If you enjoyed this blog post about insulation options, please try reading up on another one of our blog posts – Insulated Loft Hatch, Insulated Garage Doors, External Wall Insulation or Celotex Insulation.

Author Avatar
Craig Maxwell
Craig Maxwell is an experienced professional with over 10 years of expertise in the field of insulation. Throughout his career, he has honed his skills and acquired in-depth knowledge in all aspects of insulation, specializing in both traditional and modern insulation techniques. Craig's passion for creating energy-efficient and comfortable living spaces has driven him to become a trusted expert in the industry.

1 thought on “100mm Insulation vs. 50mm Insulation vs. 25mm Insulation: Which is Right for You?

    • Author gravatar

      Hey! I’m living is standard 3 bedroom semi-detach house with small side extension. The main walls have cavity walls but side extension is single wall. I’m looking at installing external wall insulation and thought 75mm all around but 100mm on single wall. Do you think I’m going for right combination to maximise heat loss, prevent damp/heat issue from single wall.

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