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4 Types of Insulation for Metal Roofs: A Comparative Guide

Posted on March 16, 2024

4 Types of Insulation for Metal Roofs: A Comparative Guide

Metal roofs, renowned for their durability and aesthetic appeal, bring along a unique set of challenges that makes insulation a crucial consideration. That’s why, in this guide, we will delve into the world of metal roof insulation, addressing the reasons why it is needed for your home and going over a few of the types of insulation you can install. 

The Need for Metal Roof Insulation

Though metal roofs are resilient, they present challenges that insulation can effectively address. Here are some of the reasons why you need to ensure that your metal roof has the proper amount of insulation:

a) Reduce Heat Transmission

Metal roofs are good conductors of heat. While they do reflect a large portion of UV rays,  they can still transmit heat to the interior of a building. This calls for the need for insulation below the metal roof in the attic. Without proper insulation, your home and attic can become an oven during summer. Insulation acts as a barrier, preventing the direct transfer of heat into your living space, ensuring a more comfortable indoor environment.

b) Reduce Sound

Apart from the heat, the sound of rain or hail on a metal roof can be quite intrusive and bothersome to some homeowners. Un-insulated metal roofs amplify the sound, creating a constant drumming noise, while insulation acts as a dampening layer, absorbing and reducing the impact of this sound in your home. This not only provides a quieter indoor environment but also enhances the overall acoustic comfort of your home.

c) Increase the Metal Roof’s Energy Efficiency

Though metal roofs are already known to be one of the most energy-efficient roofing materials, adding insulation can further enhance the energy efficiency of your home. Insulating your metal roof is not just about comfort, it’s a sustainable choice that contributes to energy efficiency. By minimizing heat transfer, insulation helps regulate indoor temperatures, which reduces your reliance on heating and cooling systems, leading to lower energy bills and a smaller carbon footprint.

Expert Recommended Insulation For Metal Roofs

Next, let’s explore the top insulation options recommended by experts in greater detail:

1. Fiberglass Insulation for Metal Roofs

Fiberglass Insulation

Fiberglass insulation is a versatile and widely used option. Its thermal performance is excellent, providing effective heat resistance. This cost-effective insulation comes in batts or rolls, making it relatively easy to install. It’s also flexible, allowing it to fit into irregular spaces, ensuring comprehensive coverage.



Widely available

Good thermal resistance


Prone to settling over time

It can be irritating to the skin and eyes during installation

2. Foam Board Insulation for Metal Roofs

Foam Board Insulation

Foam board insulation is another metal roofing insulating option that offers excellent thermal resistance and durability. Since it is available in various thicknesses, this allows homeowners to choose the level of insulation needed for their specific needs and the climate in the area. Moreover, foam boards are moisture resistant, making them suitable for humid climates where condensation control is necessary.


High thermal resistance

Moisture resistant

Easy to cut and install


Can be more expensive than fiberglass

May require additional sealing to prevent air infiltration

3. Reflective Foil Insulation for Metal Roofs

Reflective Foil Insulation

Reflective foil insulation is a type of roof insulation generally made of aluminum and a reflective material. The shiny surface reflects the maximum amount of heat and radiation, keeping the interior of the building cooler in hot weather.  


Effective in reducing radiant heat transfer

Reduces the heating and cooling costs of a building, potentially saving money

Lightweight and relatively easy to install


Prone to dust buildup over time that can reduce its effectiveness

Higher initial cost compared to other types of metal roof insulation 

4. Spray Foam Insulation for Metal Roofs

Spray Foam Insulation

Spray foam insulation provides a seamless and airtight barrier, offering superior thermal performance. However, it is more expensive than other types of insulation for a metal roof. It’s also different from rigid and foam board insulation in that it is installed through spraying the material onto a surface, on which it expands. This feature allows it to fill gaps and crevices, ensuring an airtight seal. This type of insulation is ideal for irregular roof structures, providing an effective solution for hard-to-reach areas.


Seamless and airtight insulation

Excellent for irregular roof structures

High R-value per inch


Professional installation is recommended

Initial cost may be higher than other options

What Is The Best Insulation For Metal Roofs?

Determining the best insulation for your metal roof depends on various factors, including your budget, climate, and specific requirements. Fiberglass insulation is cost-effective and versatile, while foam board insulation provides durability. Reflective insulation is known for its effective heat reflection of up to 95%, and spray foam insulation offers unmatched coverage. 

If you want to make the right decision, consider consulting a roofing professional to assess your unique needs and determine the most suitable insulation option for your metal roof. A professional will be able to provide valuable insights into what you need based on the specifics of your metal roof.

Insulating your metal roof is essential if you want to address issues like heat transmission, sound dampening, and energy efficiency. Whether you opt for fiberglass, foam board, spray foam, or reflective foil, each option comes with its own set of advantages. Choose wisely, considering your personal circumstances, and enjoy the benefits of a well-insulated metal roof.

Contact The Roofing Experts In Hattiesburg, MS, For Your Roofing Needs

If you are considering installing insulation under your metal roof, contact the metal roofing experts in Hattiesburg, MS. B&A Roofing is a renowned roofing company in Mississippi that has decades of combined experience in the industry. Our expert roofers are always ready to handle whatever your roof requires, whether it’s insulation, repairs, or a complete replacement. Contact us today at (601) 520-3183  for your roof inspection.

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