Difference Between Insulated and Non-Insulated Steel Doors

Steel doors are a popular choice for both interior and exterior applications due to their strength, durability, and sleek aesthetic. However, one of the key considerations when selecting steel doors is whether they should be insulated or non-insulated. This decision impacts thermal performance, design, and functionality. Below, we explore the differences, applications, and advantages of both options.

Insulated vs. Non-Insulated Steel Profiles

Thermally Broken (Insulated) Steel Profiles

Thermally broken steel profiles are designed to provide superior thermal performance. They consist of two steel sections separated by an insulating material, which reduces heat transfer through the frame. This construction makes them ideal for:

• Energy efficiency: Essential in climates with extreme temperatures.
• Comfort: Helps maintain consistent indoor temperatures.
• Compliance: Meets building codes requiring high thermal performance for external doors and windows.

Non-Thermally Broken (Non-Insulated) Steel Profiles

Non-insulated steel profiles, by contrast, do not include thermal breaks. They conduct heat more readily, making them suitable for applications where thermal efficiency is not a priority. These profiles are commonly used for:

• Internal steel doors: Such as room dividers, where insulation is unnecessary.
• Historic restoration projects: In Britain, for example, heritage steel windows like the W20 series are non-insulated. While these can sometimes be fitted with double glazing to enhance performance, their design remains focused on maintaining historical accuracy rather than thermal efficiency.

Applications of Insulated and Non-Insulated Steel Doors

Interior Doors (Non-Insulated)

Internal steel doors are typically non-insulated because there is no need for thermal separation. They are valued for their minimalist appearance, ability to create open and light-filled spaces, and compatibility with modern or industrial interiors.

Exterior Doors and Windows (Insulated or Non-Insulated)

External steel doors and windows can be either insulated or non-insulated, depending on the project’s requirements:

• Non-insulated: Often used in heritage or restoration projects where maintaining the original look is critical. For example, W20 profiles are widely used in Britain for historic buildings, as they comply with preservation standards.
• Insulated: Modern insulated steel profiles, such as those offered by Ottostumm or Secco Sistemi, provide enhanced thermal performance. These profiles are bulkier than non-insulated options but offer better energy efficiency, making them suitable for new builds or renovations prioritizing sustainability.

Advantages of Steel Doors and Windows

Steel doors and windows, whether insulated or not, offer several benefits:

Versatility

Steel profiles can be used to create various types of doors and windows, including:

• Entry doors
• Patio doors
• Fixed or operable windows
• French doors
• Bi-fold or sliding doors

Strength and Durability

Steel doors and windows are exceptionally robust, offering:

• Burglary resistance: Many insulated external profiles are impact-tested and meet security standards for high-risk areas, including coastal regions.
• Longevity: Steel frames can withstand harsh weather conditions and maintain their structural integrity for decades.

Aesthetic Appeal

Steel doors and windows are celebrated for their timeless beauty. They are often painted in black or other colors using powder coating in the RAL palette. Additionally, they are available in premium finishes like stainless steel, bronze, and brass, providing design flexibility for both traditional and contemporary projects.

Compliance with Building Regulations

Steel doors and windows are frequently required in historic buildings to comply with building control regulations. They offer the perfect balance between preserving architectural heritage and meeting modern standards.

Conclusion

When choosing between insulated and non-insulated steel doors, consider the specific needs of your project. Internal steel doors thrive on simplicity and elegance with non-insulated profiles, while external applications benefit from the enhanced thermal performance and security of insulated profiles. Regardless of the choice, steel doors and windows bring unparalleled strength, style, and versatility to any building.