We are a full-service roofing contractor located in beautiful Bellingham, WA. We install, maintain, and repair roofs throughout northwestern Washington, including Whatcom, Skagit, and Island Counties.
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Serving Whatcom, Skagit & Island Counties



Insulation Under Metal Roof

Why Is Insulation Under Metal Roofing Important?

Metal roofing has many benefits, including its durability and long lifespan. Metal roofing can last two to four times longer than traditional asphalt shingles. It’s also one of the most eco-friendly options available; not to mention its sleek, modern look. It’s no wonder that more people are choosing metal roofs for their homes and buildings. With that said, metal roofs need proper insulation in the building design in order to perform as they are intended. There are several reasons that insulation under metal roof is important, including increased lifespan and performance, but it can also help save money in energy costs and control condensation.

If you are considering a metal roof, contact our roofing professionals for a free consultation. We are happy to answer your questions and make recommendations based on your structure, style preferences, and budget.

What is Roof Insulation?

Roof insulation refers to the material or materials that are installed within the roofing system of a building to prevent the transfer of temperatures. It helps with heat, cold, sound, and moisture between the interior and exterior of the structure. It plays a crucial role in maintaining a comfortable and energy-efficient indoor environment. Roof insulation is typically placed between the roofing materials (such as metal, shingles, or tiles) and the interior ceiling or attic space.

There are three main types of best insulation for under a metal roof, each with its own characteristics and benefits:

  1. Fiberglass insulation: Fiberglass insulation is one of the most common types of roofing insulation. It consists of glass fibers that are tightly packed together. Fiberglass insulation is available in batts (pre-cut panels) or loose-fill form, and it provides good thermal insulation.
  2. Rigid foam board insulation. Rigid foam board is more expensive than batt insulation because the R-values of foam board are much higher. This is a great outdoor insulation option as long as your roof is vented to allow for airflow (and therefore moisture control) and you apply a vapor barrier.
  3. Spray foam insulation: Spray foam is the other type of foam insulation. Spray foam expands and adheres to surfaces, creating an airtight seal. Spray foam insulation is also more expensive than fiberglass batts and it also tends to have a lower R-value per inch than rigid foam but if you need complete insulation, spray foam can be a great option.

The choice of insulation material and its installation method depends on factors such as climate, building structure, budget, and local building codes. We recommend working with a local roofing contractor who has expertise in roofing and insulation to ensure that the right type of insulation is used for your specific needs.

Why is Insulation Under Metal Roof Important?

Insulation is important for metal roofs for several reasons:

  1. Temperature regulation. Metal roofs can become very hot in direct sunlight, especially in the warm summer months. Without proper insulation, this heat can easily transfer into the inside of the building, causing discomfort for occupants and potentially increasing cooling costs. Insulation acts as a barrier, reducing the transfer of heat and helping to maintain a more comfortable indoor temperature.
  2. Energy efficiency. Insulating a metal roof can significantly improve the energy efficiency of a building. By reducing heat transfer, insulation helps to keep the interior cooler in the summer and warmer in the winter, which in turn reduces the need for excessive use of air conditioning and heating systems. This can lead to lower energy bills and a reduced carbon footprint.
  3. Condensation control. Metal roofs can develop condensation when warm, moist air inside the building comes into contact with the cold metal surface. This can lead to problems such as mold growth and deterioration of building materials. Insulation helps to create a barrier that minimizes the temperature difference between the interior and exterior surfaces, reducing the likelihood of condensation forming.
  4. Noise reduction. Rain, hail, and other external noises can be quite loud on a metal roof. Insulation can help dampen these sounds, creating a quieter and more comfortable indoor environment.
  5. Protection against corrosion. Some metal roofs, particularly those made from steel or other susceptible materials, are vulnerable to corrosion over time. Proper insulation can help prevent moisture from reaching the metal surface, reducing the risk of rust and corrosion.
  6. Prevent ice dams. An ice dam occurs when a ridge of ice forms at the edge of a roof and prevents melting snow from draining off like it should. Accumulated water trapped behind ice dams has the potential to infiltrate your home, causing damage. Insulation can act as a preventive measure against the formation of ice dams by maintaining a cold roof surface because it acts as a barrier between indoor heat and the roof surface.
  7. Improved comfort. Adequate insulation can contribute to overall comfort within a building by maintaining a more stable indoor temperature. This is particularly important in commercial and residential spaces where occupants spend a significant amount of time.
  8. Longevity of roof. Insulation can also extend the lifespan of a metal roof by reducing the stress caused by temperature fluctuations. Metal roofs expand and contract with temperature changes, and insulation can help mitigate these movements, preventing potential damage and extending the roof’s longevity.

When selecting insulation for a metal roof, it’s important to consider factors such as the climate. Equally the type of metal roofing material, and the building’s overall design. The best way to choose the right insulation option is to consult with a professional roofing contractor. Or you an insulation specialist who is familiar with roofing needs presented by the local climate and other factors such as design.

Trust Skyline Roofing & Construction for your roof maintenance needs

At Skyline Roofing & Construction our roofing professionals always strive to add value to your home or business for the long term – and that includes maintaining your roofing investment. Contact us today to schedule your roof cleaning to keep your roof strong and healthy. Skyline Roofing is located in Bellingham, WA and we presently serve Whatcom, Skagit, and Island Counties.

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