Is It Recommended To Insulate Under A Metal Roof?

Metal roofing is quite the trend nowadays. So many people opt for metal roofing and insulation for several reasons. It is more durable and also beautiful. While there is no doubt a metal roof is a cool and super option, there have been several doubts regarding its insulation.

Let’s make one thing clear. No matter how strong the roofing is, your roof needs insulation. So, if you ask if insulating under a metal roof is necessary, yes, it is indispensable. This is because insulation helps maximise the energy efficiency of the metal roof.

So, this article will discuss why insulating your metal roof is necessary and the different options you can try.

Metal roof insulation

A lot of roofing problems arise from one single issue – moisture. So, it is best to take possible measures to eliminate moisture. And the right way to go about it is metal roof insulation. What does metal roof insulation do? It helps in high thermal conductivity and stops heat transfer. In addition, when you properly install metal roof insulation, it reduces the noise caused by heavy rain or extreme wind. With additional insulation like vapour barriers and others, you can also reduce a lot of moisture.

Types of metal roof insulation

There are several options when it comes to metal roof insulation, but the three common ones are fiberglass batts, rigid board insulation, and spray foam.

Fiberglass Batts

Fine glass formations are woven together and mixed with several other materials to form a thick insulating pad. Fiberglass batts are the cheapest and easiest to insulate but may not be the safest to use if you install them without care.

Rigid Board Insulation

Rigid board insulations are sheets or panels made from polystyrene or polyurethane that provide thermal resistance to roofs. It offers maximum thermal resistance and reduces air leakage. But the joints must be taped to stop airflow.

Spray Foam

Spray foam insulation is when insulation is mixed with water and is sprayed as a heated liquid through high-pressure spray machinery. As the foam reacts to oxygen, it expands and hardens, giving thick, rigid foam protection.


Does my metal roof sweat?

Yes, metal roof sweating is quite common. When there is too much humidity, the underside of the roof sweats. You can opt for underlayment and proper ventilation to avoid metal roof sweating.

Does plywood or a vapour barrier necessary under a metal roof?

A vapour barrier helps in preventing too much condensation under the metal roof. Since it stops moist air from flowing through the insulation, a vapour barrier is necessary under a metal roof. On the other hand, plywood is not an essential requirement. However, it helps protect the insulation and offers added soundproofing.

Wrapping Up

It is essential to insulate under your metal roof. But there are several varieties available in the market, and you can choose one based on your needs and preferences. Proper insulation of your metal roof will help prevent moisture infiltration and boost the metal roof’s durability.

John Forbes

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