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How To Prevent Condensation On Corrugated Roofing

Key Takeaways:

  • Your corrugated roof is more susceptible to condensation than other types of roofing.
  • You need to use a vapor barrier and proper insulation to stop condensation.
  • Prevention is essential when dealing with condensation on corrugated roofing.
  • Poor ventilation and moisture can lead to condensation on corrugated roofing.
  • Keep your roof well-maintained and in great condition to avoid any significant problems down the line.

Any commercial roofing contractor can vouch for the fact that condensation is an enemy of a flat or corrugated roof. Not only can it cause debilitating damage to the roof itself, but it can also contribute to the growth of mold and mildew, which can pose a severe health hazard to anyone working or living in the building.

So, what is the recommended course of action for preventing condensation from forming on your roof? Modern Exterior Systems will show you how in this guide.

1. What is condensation, and why does it form on corrugated roofing?

To explain a bit further, condensation is the process of water vapor turning into liquid water. Let’s make it even simpler: when warm air hits a cold surface, such as a corrugated roof, the air cools, and the water vapor in the air turns into liquid water. This can happen even when the outside temperature is above freezing.

2. How can I prevent condensation on my corrugated roof?

A few things are possible to prevent condensation on your corrugated roof:

Use a vapor barrier:

A vapor barrier is a material that prevents moisture from penetrating it. You can prevent condensation – or similar occurrences – on your roof by installing a vapor barrier between the roofing and the insulation.

Insulate the roof:

By insulating the corrugated roof, you can prevent the warm air inside your house from coming into contact with the cold surface of the roof. This will keep the roof’s temperature closer to the temperature of the air inside the building, preventing condensation from occurring.

Ventilate the space:

If your roof is not insulated or vapor-barrier protected, you can ventilate the space between the corrugated panels to keep condensation at bay. You can achieve this by installing vents in the soffit or ridge of the roof.

3. How to determine if you have a condensation problem

Whereas it may not be so easy to pinpoint a condensation problem on your roof, there may still be some telltale signs that you can look out for.

Water stains on the ceiling:

One of the most common signs of a condensation problem is water stains on the ceiling. The presence of brown or yellow stains on your ceilings clearly indicates that condensation has taken over your roof and is causing water to drip down into your home.

High humidity levels:

If you notice that the air in your home is abnormally humid, it could be a sign of condensation. As we explained above, condensation often occurs when there is high humidity in the air. 

Mold or mildew:

Mold or mildew thrives in warm, moist areas. If you see mold or mildew growing and spreading on any surfaces in your home, it could signify – you guessed it – condensation. The simple causality lies in the fact that these ancient fungi love the idea of moisture and heat combined. 

Musty smells:

Musty smells originate from mold and mildew or other fungi. If the mold in your home is the result of condensation on the roof, a musty smell could be a good indicator, even when the mold isn’t visible. 

4. The causes of condensation on corrugated roofing

Poor ventilation:

Lack of proper or efficient ventilation is one of the most common causes of condensation. If your home is not adequately ventilated, it can open the gates and welcome the enemy of your corrugated roof.

Lack of insulation:

Another typical cause of condensation is the lack of insulation. If your home is not appropriately insulated, it can cause the air inside to be cooler than the outside, welcoming moisture in.


Since condensation is moisture, a sign of one points to the presence of the other. The presence of too much moisture, if not controlled, can cause condensation to ensue.

5. Additional tips for keeping your roof in good condition and preventing condensation:

Ensure the cleanliness of gutters 

The excessive accumulation of leaves, branches, and other debris in your gutter can cause havoc. Clogged drains not only cause condensation, but they can also damage your roof.

Keep your attic well ventilated

Good ventilation will help to keep the air inside your home dry. When too much moisture accumulates, it can cause condensation.

Use a dehumidifier

Using a dehumidifier can be great if you live in an area with high humidity. It can help to remove excess moisture from the air in your home. 

Inspect your roof regularly for any signs of damage or leaks

Leaks can cause unprecedented damage to your house wherever they occur. Water, when left unchecked, will cause wood to rot and metal to rust. Be sure to check your roof regularly for any signs of leaks or damage.

Be sure to repair any leaks or damage as soon as you see them

The longer you procrastinate, the damage will only get worse and become more expensive to fix.

Take measures to prevent ice dams

Ice dams are a cause for water to back up under your shingles and leak into your home. To prevent this, ensure your gutters are clean and clear of debris. 

Consider hiring a professional

The most important thing worth mentioning is that a professional should inspect your corrugated roofing at least once a year. With metal roofing, you can usually get away with checking it yourself. However, corrugated roofing is a little more delicate and should be looked at by someone with the necessary expertise.

Ending Note:

Protecting your corrugated roof from condensation can be difficult. However, taking the proper precautions and vigilance can prevent significant problems. Consult a professional when you think matters are getting out of control.

Modern Exterior Systems, serving Burnsville, MN, has been in the metal business for several years. So, whether it’s standing seam metal roofing or stone-coated metal roofing, we have the experience to help you make an informed decision. Let our seasoned professionals take care of your metal roof-related problems so you can take care of what’s important to you.

Get your free estimate today.