Should You Insulate Under a Metal Roof?

by | Mar 20, 2024 | Roofing

Most folks appreciate the benefits of insulating their attics, walls, and crawl spaces, but they always wonder if insulation under metal roofing is necessary. You’d certainly save time, effort, and money by not doing it. So, should you save that buck or insulate under your metal roof? 

Insulation under metal roofing is necessary and a best practice. It helps to retain household heat during winter, also keeping the house cooler in summer. Insulation helps maintain your preferred temperatures at home no matter how hot or cold it gets outside. It’s also a sound barrier, reducing noise from outside. 

Let’s explore how metal roofs work and how insulating under them can save you money in the long run. 

Understanding the Basics of Metal Roofing

Metal roofs have been around for ages and are gaining popularity as a durable and energy-efficient alternative to traditional roofing materials. They vary in style and finishes, making them suitable for any home design. 

If you’re looking for a roofing company in Lexington, Kentucky, then contact the team at Jacob’s Ladder today for a quote.

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You most likely know that metal roofs last close to half a century, but metal roofing offers other benefits, like:

  1. Low maintenance thanks to its durability.
  2. High resistance to extreme weather conditions.
  3. Energy efficiency is due to its reflective properties.
  4. Eco-friendliness: shingles and panels are recycled and recyclable.
  5. Cost-effectiveness in the long run as it requires fewer repairs and replacements compared to other roofing materials.

So, how does metal roofing provide all these benefits? It features metal panels or shingles coated with a special finish to protect against rust and corrosion. This coating also helps to reflect sunlight, keeping the roof and attic cooler in summer.

The Potential Challenges Related to Temperature Regulation

Unfortunately, metal roofs aren’t perfect, and they have some potential challenges with temperature regulation. Even though these panes or shingles are coated, they are still excellent thermal conductors. 

They transfer heat quickly, which can be a problem in both summer and winter. In the summer, metal roofs transfer heat from the sun into your home, making the interior uncomfortably hotter. 

In winter, the shingles and panels conduct away the interior warmth, and your air conditioning will consume more power to keep your home warm. So, if it gets so hot and cold up there, can you put solar panels on a metal roof?

Don’t worry – you can leverage several ways to overcome these challenges and still enjoy the benefits of metal roofing.

One solution is to ensure proper insulation between the roof and attic, creating a barrier that prevents heat transfer. Another option is to choose a lighter-colored metal roofing material that reflects more sunlight.

What’s the Importance of Insulation for Metal Roofs?

Insulation is vital for metal roofs because it helps regulate temperature and ultimately prevents heat transfer. It also reduces energy consumption by retaining your home’s warmth during winter and keeping the hot summer heat outside.

Installing the insulation makes all the difference for your comfort as well as your pocketbook. It can also prolong the life of your metal roof by reducing stress on the roofing materials.

Insulation is usually installed between the roof and attic, with the most commonly used materials being fiberglass, cellulose, or foam boards. Proper installation is essential, as even small gaps or inadequate coverage can compromise its effectiveness.

Remember, heat travels from warmer to cooler areas, so the more insulation you have, the less heat is transferred through your metal roof. Airtight insulation ensures no air leaks through the cracks, minimizing heat transfer.

Insulate Your Metal Roof to Reduce Condensation

Condensation is a serious concern for metal roofing, especially during winter. As you know, hot air always rises, conducting heat from warm to colder areas. 

When warm air in your home rises, it hits the cold metal roof, which cools it down. As it cools, it condenses into water droplets, which accumulate over time and cause issues like: 

  • Mold growth.
  • Rotting wood.
  • Dumpy air.
  • Structural damage.
  • Metal corrosion.

Moreover, too much humidity makes your home feel cold and stuffy, causing discomfort and posing health risks. Excessive humidity also overworks your air conditioning, leading to higher energy bills.

Insulating your metal roof helps prevent condensation by keeping warm air inside your home. It minimizes the escape of warm air into the cold outdoor environment. 

So, what about air circulation for ventilation? Don’t worry; proper insulation does not completely seal off your roof. There are still ways for air to circulate, such as soffit and ridge vents. But doing it right is crucial.

The Key Considerations for Insulating Under a Metal Roof

Insulating under a metal roof may require strategies different from conventional insulation methods for other roofing materials. The expansion rate and thermal conductivity of metal are much higher, posing unique challenges.

To get started, here are some of the key considerations for insulating your metal roof:

1. Choose the Right Type of Insulation

Depending on your budget, climate, and building structure, you may opt for traditional batt insulation or spray foam insulation.

2. Proper Installation

Improperly installed insulation can lead to air leaks, gaps, and uneven distribution of insulation.

3. Attention to Detail

Pay attention to seams, corners, and joints where heat can easily escape if not properly insulated.

4. Vapor Barrier

Installing a vapor barrier is essential to prevent moisture from entering through the insulation and causing condensation issues.

5. Adequate Ventilation

As mentioned earlier, proper air circulation is crucial.

6. Professional Assistance

When in doubt, it’s always best to consult with a professional who has experience in insulating metal roofs.

Additional Tips for Insulating Under a Metal Roof

Besides the key considerations mentioned above, here are some additional tips for insulating under a metal roof:

1. Consider Using Reflective Insulation

Reflective insulation can help reduce heat transfer and improve energy efficiency, especially in hot climates.

2. Don’t Forget about the Attic

If your metal roof is installed over an attic space, it’s crucial to insulate that area, too. Heat rises, so proper insulation in the attic is crucial for an airtight seal.

3. Seal Any Air Leaks

Before installing insulation, seal any potential air leaks in your roof, including gaps around vent pipes, chimneys, and other openings.

4. Use the Right Tools and Safety Gear

Insulation installation requires special tools and safety gear, like gloves, goggles, and a respirator. Use them properly to protect yourself and ensure a successful installation.

The Different Insulation Options for Metal Roofs

So, which options do you have for insulating under your roof? From blanket to spray foam insulation, what works best for metal roofs? Here are some common insulation types used for metal roofs:

1. Batt or Blanket Insulation 

This insulation type features fiberglass, cotton, or mineral wool and comes in pre-cut panels. You may join the bandwagon and use it for the ease of installation and affordability.

2. Reusable Insulation

This cost-effective metal roof insulation option is eco-friendly and mostly recycled from materials like denim or cardboard. You can use it for new and existing metal roofs.

3. Spray Foam Insulation

This insulation type combines chemicals like polyurethane or polyisocyanurate and comes in a liquid form. When you apply it, it expands, filling any gaps and creating an airtight seal.

4. Reflective Insulation

As mentioned earlier, reflective insulation goes on the roof, helping to bounce away most of the incoming heat. In this post, we explain why you should use glass paint for reflective roofs: “How to Reduce Heat from a Metal Roof.”

5. Rigid Board Insulation

This insulation option comes in rigid sheets made of foam board materials like polystyrene, polyisocyanurate, or polyurethane. It’s a durable and moisture-resistant option suitable for metal roofs.

Final Thoughts on Insulation Under Metal Roofing

We believe that, in most situations, roofing insulation is a must-have for metal roofs. With a generous selection of insulation options, choose wisely based on your roof’s structure and budget. Though the type of insulation you select depends on various factors, an airtight seal and proper installation are critical for optimal performance. 

If you’re in Lexington or any other Kentucky location, we’d be glad to help you choose the right insulation for your metal roof. Contact us today at Jacob’s Ladder for expert advice and quality installation services.

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We recently had Jacob’s Ladder replace our roof, and I’m really glad we chose them. They were professional and really attentive to detail. Andrea and Lisa were great at keeping us informed throughout the process. They even checked in with us multiple times to make sure we were happy with how things were going.


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Jacob's Ladder did a roof replacement job for a shed in my Backyard. I am very much satisfied with their work and definitely recommend them for all of your roofing needs.


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In May of 2022 a very damaging hail and windstorm pretty much destroyed my entire roof in Lexington Kentucky. Due to an insurance company that did not want to pay Jacobs Ladder was able to negotiate payment for an entirely new roof, decking and all which now meets current codes. Final work was completed January of 2023. Now my roof which leaked into my kitchen from May 2022 through December of 2022 has ceased to leak onto my kitchen floor. Their work is so good it withstood the 100 mph plus winds of 3rd March 2023.


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Easy to communicate with, professional, cleaned up after working. All around #1 business!! I recommend Jacob’s Ladder for all your related needs, they’re very friendly and treat you right!


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Very pleased with the roof!




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Jacob’s Ladder did a great job for us. They where easy to contact, knowledge in handling Insurance claim did our job in a timely manner and left no mess behind. Very pleased.

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