Comparing Two Natural Insulation Materials: Thermacork vs. Havelock Wool

In the field of sustainable building, choosing the right insulation material can significantly impact the environment, the overall performance of a structure and the carbon footprint.

Two standout natural insulation options are available through Small Planet Supply: ThermaCork expanded cork insulation and wool insulation from Havelock Wool. Both offer unique benefits, yet they cater to different needs and preferences. Let's delve into a comparison of these two innovative products to help you make an informed decision.

Why Use Natural Insulation?

Natural insulation materials are gaining popularity over standard insulation options due to their numerous environmental and health benefits. Unlike conventional insulation materials like fiberglass or foam, which can contain harmful chemicals and contribute to environmental degradation, natural insulation offers a sustainable and non-toxic alternative. These materials are derived from renewable resources, reducing the reliance on fossil fuels and minimizing environmental impact. Moreover, they are free from harmful chemicals and synthetic additives, making them safer for both installers and occupants.

Cork being harvested from an oak tree in Portugal

At the end of their lifecycle, natural insulation materials can decompose without harming the environment, unlike many synthetic options that contribute to landfill waste. Additionally, natural insulation can help reduce indoor air pollution by not off-gassing volatile organic compounds (VOCs) and by actively filtering the air in some cases. Many natural insulation materials have superior thermal properties, which can contribute to reduced energy consumption and lower utility bills.

What is Expanded Cork Insulation?

Thermacork can be used as interior insulation, or as exterior exposed insulation, if selecting facade grade

ThermaCork expanded cork insulation is derived from the bark of cork oak trees. This material is harvested without harming the tree, allowing the bark to regenerate over time. Cork trees primarily grow in the Mediterranean region, making cork a renewable and sustainable resource. It has excellent thermal insulation properties, reducing heat transfer and maintaining stable indoor temperatures. Its cellular structure makes cork an effective sound absorber, providing superior acoustic insulation. Cork is also naturally resistant to moisture, mold, and mildew, ensuring durability and longevity. It also has inherent fire-resistant properties, adding an extra layer of safety to buildings. Cork production is environmentally friendly, with low energy requirements and minimal waste. ThermaCork expanded cork is suitable for a variety of applications, including wall and roof insulation, flooring, and even as an underlayment. Its versatility makes it an excellent choice for both residential and commercial buildings.

What is Havelock Wool Insulation?

Sheep simultaneously eating and growing wool

Havelock Wool insulation is made from the wool of sheep. This material is sourced primarily from New Zealand, where sheep farming practices focus on animal welfare and environmental sustainability. Wool is a renewable resource, sheared annually without harm to the sheep. Wool fibers have a natural crimp, creating air pockets that enhance thermal insulation and energy efficiency. Wool can absorb and release moisture without losing its insulating properties, helping to regulate indoor humidity levels. Additionally, wool fibers can trap airborne pollutants, improving indoor air quality.

Havelock wool batts are pre-cut to easily fit into wall cavities

At the end of its lifecycle, wool insulation is biodegradable, making it an eco-friendly choice. Wool production is a low-impact process, with a focus on sustainable farming practices. Havelock Wool is ideal for wall, roof, and floor insulation. It is particularly beneficial in projects focused on healthy indoor air quality and environments that are prone to moisture issues.

When comparing these two materials, several differences arise. ThermaCork is made from oak tree bark souced from Portugal, while Havelock Wool is made from sheep wool, predominantly sourced from New Zealand. ThermaCork is naturally resistant to moisture and does not support mold growth, whereas Havelock Wool can absorb and release moisture, maintaining insulating properties and regulating humidity.

Both materials are renewable and sustainable, but cork harvesting involves tree bark regeneration, while wool production involves annual shearing of sheep. ThermaCork offers superior fire resistance and acoustic insulation, while Havelock Wool contributes to improved indoor air quality by trapping pollutants. Havelock Wool and ThermaCork both providee acoustic insulation.

Both ThermaCork expanded cork and Havelock wool offer exceptional benefits as natural insulation materials. Your choice will depend on specific project needs, environmental considerations, and personal preferences. If you have questions about which material is right for your project, don’t hesitate to reach out to Small Planet Supply.

Natural Insulation Webinar

If you’re wondering whether ThermaCork or Havelock wool will work for your home or project and want to learn more about both products, join us for a Natural Insulation webinar on September 12. You can register using the button below.