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Sisalation 456 Extra Heavy Duty: A Comprehensive Guide for Your Roofing Project

Updated: Jul 26, 2023

A roll of Sisalation 456 half unrolled for as a display

When it comes to roofing, insulation plays a crucial role in maintaining a comfortable indoor environment while reducing energy consumption. One product that stands out in the market for its insulation capabilities is Sisalation 456 Extra Heavy Duty. In this blog post, I'll provide you with valuable information about this product, its uses, limitations, and alternatives to help you make an informed decision.

Also if you're not quite sure if this is the product for you be sure to check out our Roof Sarking Buyers Guide where you can compare some alternatives.

What is Sisalation 456 Extra Heavy Duty?

Sisalation is a type of reflective foil insulation made from aluminum foil laminated to a strong, tear-resistant backing material. Sisalation 456 Extra Heavy Duty is a high-quality, extra durable variant of this product designed for use in various applications, including roof sarking and Sisalation paper. It serves as a protective barrier, preventing heat transfer, moisture infiltration, and reducing condensation issues in your building.

Sisalation 456 uses

  1. Residential applications: Sisalation 456 is widely used in homes, offering excellent insulation properties that help keep the interior cool in summer and warm in winter. It also provides added protection against moisture and condensation, prolonging the life of your roofing materials.

  2. Commercial applications: This product is suitable for commercial buildings such as offices, warehouses, and factories, providing energy efficiency and ensuring a comfortable working environment.

  3. Retrofit projects: Sisalation 456 can be retrofitted to existing buildings, offering an effective solution for improving insulation and reducing energy consumption.

Discover more about Sisalation 456's applications in our comprehensive buyer's guide here.

What are the limitations of Sisalation 456?

Close up photo of some Sisalation 456 showing the blue non-reflective side

While Sisalation 456 is a versatile and effective product, it's essential to be aware of its limitations:

  1. Climate considerations: Sisalation 456 is best suited for temperate climates. In extremely cold or hot environments, you may need to consider additional insulation options.

  2. Installation restrictions: Proper installation is crucial for the effectiveness of Sisalation 456. Improper installation may reduce its insulating properties and even cause damage to the product.

  3. Material limitations: Although Sisalation 456 Extra Heavy Duty is highly durable, it can still be punctured or damaged if not handled with care.

Pros and Cons of Sisalation 456


  1. Excellent insulation properties

  2. Reduces condensation and moisture infiltration

  3. Durable and tear-resistant

  4. Suitable for various applications


  1. Not ideal for extreme climates

  2. Requires proper installation for optimal performance

  3. Potential for punctures or damage if mishandled

Alternatives to Sisalation 456

A photo of two pallets of Sisalation roof insulation stacked up

Anticon: Anticon is a combination of reflective foil and glasswool insulation, offering both thermal and acoustic insulation properties. It's ideal for residential and commercial applications.

  1. Proctor Wrap: Proctor Wrap is a high-performance vapor-permeable membrane designed for use as a reflective insulation layer. It provides excellent moisture control and can be used in various building applications.

  2. Air cell insulation: Air cell insulation is a thin, multi-layered product that provides effective thermal insulation and radiant heat barrier. It's lightweight and easy to install, making it a popular choice for many construction projects.


Sisalation 456 Extra Heavy Duty is an excellent choice for roof insulation, offering numerous benefits such as outstanding insulation properties, moisture control, and durability. However, it's essential to be aware of its limitations and ensure proper installation to achieve optimal results. To make the best decision for your roofing project, consider exploring alternative insulation options like Anticon, Proctor Wrap, and air cell insulation.

By comparing these products and understanding their specific benefits and drawbacks, you can confidently choose the insulation solution that best meets your needs and ensures a comfortable, energy-efficient space.

Ready to make an informed decision? Dive deeper into the world of roof insulation by checking out our comprehensive buyer's guide, where you'll find detailed information on Sisalation 456 Extra Heavy Duty and its alternatives. Click here to Buy Now!

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