Common Mistakes That Lead to Excess Moisture in Metal Structures

Last Updated on March 12, 2025 by Tanya Janse van Rensburg

Moisture buildup is one of the biggest challenges metal building owners face.

From rust and corrosion to mold and mildew, excess moisture can cause serious damage if left unchecked.

The good news? Most moisture problems are preventable.

Many people make simple but costly mistakes that contribute to excess moisture inside their metal structures.

Let’s go over the most common mistakes and how you can avoid them to keep your building dry and damage-free.

1. Neglecting Proper Insulation

The Problem

One of the main causes of condensation in metal buildings is poor or missing insulation.

When warm indoor air meets the cold surface of the metal, it creates moisture buildup, also known as metal sweating.

The Solution

• Use high-quality insulation designed for metal buildings. Check out bluetexinsulation.com.
• Choose moisture-resistant insulation such as spray foam, rigid foam board, or fiberglass with a vapor barrier.
• Ensure insulation is properly installed, covering all surfaces to prevent gaps where condensation can form.

2. Poor Ventilation

The Problem

A lack of airflow traps moisture inside the building, allowing humidity levels to rise. This is especially common in storage buildings, workshops, and garages that are tightly sealed.

The Solution

• Install roof vents, wall vents, or exhaust fans to promote air circulation.
• Open doors and windows periodically to let fresh air in.
• Use dehumidifiers or air movers in areas prone to moisture buildup.

3. Using the Wrong Flooring or No Vapor Barrier

The Problem

Moisture doesn’t just come from the air—it also seeps up from the ground. Metal buildings with concrete floors or exposed dirt can absorb and retain moisture, leading to damp conditions inside.

The Solution

• Install a vapor barrier beneath concrete floors to block moisture from rising.
• Use gravel or a raised floor system if a concrete slab isn’t an option.
• Apply a moisture-resistant floor coating to seal the surface.

4. Failing to Seal Gaps and Leaks

The Problem

Even small gaps in the structure can allow humid air to enter, especially in areas with high humidity or frequent temperature changes.

The Solution

• Seal all seams, joints, and cracks with weatherproof caulking or sealant.
• Check doors and windows for leaks and install weatherstripping if needed.
• Regularly inspect the building for signs of rust or water stains, which indicate possible leaks.

5. Ignoring Roof and Gutter Maintenance

The Problem

A damaged or clogged roof drainage system can lead to leaks and standing water around the base of your metal structure. Over time, this contributes to excess moisture inside.

The Solution

• Regularly clean and inspect gutters and downspouts to ensure proper water drainage.
• Check for roof damage, missing fasteners, or loose seams that could let water in.
• Make sure downspouts direct water away from the building’s foundation.

6. Not Controlling Interior Humidity Levels

The Problem

Some metal buildings are used for livestock, machinery, or other high-humidity activities, which can cause excessive moisture buildup if not properly managed.

The Solution

• Use dehumidifiers or air conditioning units in enclosed spaces.
• Install moisture-absorbing materials, such as silica gel or desiccant packs, in storage areas.
• Monitor humidity levels and keep them below 50-60% for optimal moisture control.

The Benefits of an Aluminum Radiant Barrier

Do you want to ensure that your insulation has a radiant barrier?

This is going to be highly beneficial for reflecting heat, lowering your cooling and heating costs, and helping the environment.

But something that you have to do is ensure you’re purchasing a radiant barrier made from the right material. This will have a huge impact on how well it can do its job.

High Reflectivity

A radiant barrier should reflect heat during the summer to keep your building cool. Thankfully, aluminum does this exceptionally well.

It has a high reflectivity of 97%, which makes a huge difference in comfort levels when the temperature rises. Plus, it helps retain heat in the winter.

Lightweight

Planning to install insulation and a radiant barrier yourself? Working overhead can be challenging, so choosing lightweight materials makes installation easier.

Aluminum is an excellent choice because it’s light and easier to handle than other materials.

Durable

Durability is essential when investing in your building. Aluminum is a great choice because it lasts for years and resists corrosion—an important factor for metal buildings.

Conclusion

Preventing moisture issues in metal structures starts with avoiding these common mistakes.

Proper insulation, ventilation, sealing, and moisture control are key to keeping your building and home dry and free from damage.

By taking proactive steps to manage humidity and condensation, you can protect your investment, extend the life of your metal building, and avoid costly repairs.

If you’re experiencing moisture problems, now is the time to make adjustments before the damage becomes severe.