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How to insulate a roof: metal roof insulation options

metal roof insulation

This guide outlines the options for metal roof insulation to moderate your building’s temperature and protect against moisture and mold damage,

Adding good metal roof insulation isn’t just a great way to reduce your energy requirements. It can also make your home more comfortable. Insulation keeps your house cool on hot days, comfortably warm in winter, and helps you save money on bills. Metal roof insulation also helps protect against moisture damage and mold formation that can become problems under such roof cladding. 

What is the R-value in metal roof insulation?

While choosing metal insulation for your home, it’s essential to look at the R-value of the material. It’s the measure of thermal resistance. Typically, the higher the R-value, the better the insulation. One other thing you have to keep in mind is how buildings lose heat gain. There are three fundamental types of heat loss or gain: conductive, radial, and convective.

Metal is the most conductive material of all roofing materials. But the loss or gain of conductive heat isn’t an important factor in the overall heat loss or gain in buildings. A good material for installing insulation under a metal roof has superior convection and radiant barrier capacities. The loss or gain of radiant and convective heat is the most important contributor to total heat loss or gain in buildings with metal roofs.

It can seem overwhelming at first. Don’t forget that you can always turn to the help of professionals for metal roof insulation. Contact Legacy Service USA LLC, which has been operating since 2005. The company gained an A+ grade from Better Busines Bureau. 

Options for metal roof insulation

Depending on your needs and budget, you can choose from a variety of metal roof insulation options. Here’re the basic options for metallic roofing insulation materials.

Fiberglass Batts

Fiberglass batts provide one of the least expensive and easiest metal roof insulation options. This insulation material consists of fine threaded glass formations that are woven together. It’s blended with other synthetic materials to form a thick, rough insulation buffer. The “glass wool” used in the material is the same basic substance that is present in the fiberglass factory.

As an insulation material, glass fiber is very versatile. You can cut it in standard widths or any other width, then adapt it depending on your specific needs. The only drawback of fiberglass boats is that it isn’t very secure to use. Microscopic pieces of glass can be extremely harmful. Your hands, eyes, and even lungs might hurt. You should wear protective clothing like masks, gloves, and goggles. 

Rigid Foam Board

It’s a building material that provides heating resilience to roofs, walls, and even foundations. It comes in extruded sheets or boards or formed in different sizes, made from polyurethane or polystyrene. The R-values of the materials are expressed in inches. The thicker the material, the greater the overall R-value.

It’s thicker and thinner than other alternatives. So, you can install it with decreased joints and spaces. It’ll also diminish air outflow.

Spray Foam

This is one of the most popular and efficient metal roof insulation options. Why? 

  1. Thanks to the polyurethane shape, insulation has an R-value higher per inch and is very easy to work with
  2. You can use it to isolate old or new metal roofs without causing any disturbance, or need to recover
  3. It’s cheaper than fiberglass insulation

iFOAM, an insulation company uses a high-pressure spraying machine to apply the spray foam insulation. If you like DIY,  You can also use a pneumatic pump in the form of heated liquid. Foam is mixed with water before it is vaporized under high pressure. As it reacts with oxygen in the air and water dries out, the polyurethane foam expands. Then, it hardens in a few minutes, It translates into thick and rigid foam insulation.

Pulverized foam provides an excellent option for isolating crevices and uncomfortable shape areas. These are places where other metal roof insulation options can’t function as they’re self-adhesive. It also works very well to prevent moisture buildup and infestations of rodents and insects.

Pulverized foam is widely used with polystyrene or fiberglass insulation. If you don’t have enough experience in the application of pulverized foam, you should leave this for professionals. The use of too much of it could damage the roof. However, there’re a few small kits that you can use for small do-it-yourself work at home.

Problems moisture can cause

Do you know the health hazards that moisture in the home can cause and how roofing maintenance is a great way to avoid this problem? Mold can appear anywhere inside homes, such as on clothing, food, paper, walls, etc. It can cause allergens and irritants, which can compromise the health of residents.

Humidity is the main culprit behind the emergence of mold and mildew inside homes. That’s why it’s very important to make sure your property is safe from water leaks and other causes — such as leaking roofs — that can compromise your family’s health and the structure of your home .

With that in mind, we have some relevant information about the main causes of humidity in the home and how to solve them! Also read:
How to prevent mold: best building materials against fungal attack

Consider the quality of your roof

The roof is a fundamental part of any home. Therefore, its quality must be superior to ensure that no infiltration occurs in your residence. It turns out that moisture can damage the wood of the roof , increasing the possibility of rot, unevenness and other problems caused by water.

These structural damages compromise the security of your property, especially if periodic maintenance is not carried out on the roof of the house. When buying a quality tile to compose your roof, it is possible to minimize the risk of going through infiltration and leaking problems that are caused by the ingress of rainwater in the ceiling of the residence.

Periodically perform roof maintenance on your home

There is no set time for your home’s roof materials to deteriorate. Their quality is a factor that weighs in at this time, ensuring longevity so that the wood and tiles last as long as possible. Even so, it is essential to carry out periodic coverage maintenance.

Therefore, it is recommended that you annually carry out an inspection of the current condition of the materials, checking for broken, cracked or displaced roof section. It turns out that many people leave to carry out this work when the roof is already at the end of its useful life. Prevention is a means of prolonging this time, providing greater security for residents and avoiding dampness at home.


It’s time to move on to deciding which metal roof insulation option listed above is the best for you. First things first, it depends upon the details of your project and your budget.

If you’re you looking for a low cost? Go for fiberglass batts. You’re putting up a new metal roof and you want to make sure it’s very well insulated? Choose rigid foam. Looking for great insulation to renovate your house at a reasonable price? Pick the sprayed foam.

Regardless of which option you choose, make sure that moisture doesn’t seep into your insulation. Pick the one that’ll last a lifetime.