Moisture & Pest Control Tips for Long-Lasting Metal Structures

Metal buildings are known for their strength and durability, and they are low-maintenance as well. But, as all structures have some kind of issues, they also have. The issues are caused by moisture and pests. Yes, steel buildings don’t rot like wood, but they do develop moisture and pests. If they are not controlled at the right time and in the right way, they cause the biggest problem. They not only deteriorate the structural integrity, but also demand frequent repairs and spoil everything you keep inside the building.

These two factors can slowly damage even the toughest metal over time if not handled properly. With a few smart habits and regular checks, you can make your building last for decades. But what are those habits or ways? Curious to know, go through all the tips we have curated in this blog patiently, and don’t allow these issues to occur in the first place.

But first, know why moisture and pests are a problem!

Why Are Moisture and Pests Enemies of Metal Structures?

Metal doesn’t rot like wood, but it can corrode. Corrosion happens when metal reacts with water and oxygen, creating rust. Over time, rust eats away at the structure’s strength. Similarly, while pests can’t chew metal, they love nesting in the insulation, wall corners, or vents of metal structures, causing indirect but serious damage.

A little prevention goes a long way in saving you from repairs and keeping your building solid for decades. So, here you go-

Moisture Control Tips

1. Use Vapor Barriers – The Invisible Shield

A vapor barrier is a special layer that blocks moisture from entering your building. It’s installed between the metal panels and insulation. This simple layer prevents condensation, those tiny water droplets that form on cool surfaces inside your building.

If your metal structure wasn’t built with a vapor barrier, don’t worry. You can add one later. You will find vapor barrier streets in most hardware stores. If you don’t have installation tools like a staple gun or sealing tape, many stores rent them out for a small fee, or you can hire a local handyman for a one-time installation.

Pro Tip: If you live in a humid area, choose thicker vapor barrier sheets with higher moisture resistance.

2. Insulate Properly – Keep Temperature Stable

Insulation doesn’t just keep your building warm or cool; it also reduces moisture buildup. When warm indoor air hits cold metal, condensation forms, and insulation stops that temperature clash. You can use double bubble and woven R-17 insulation for your steel structure. Additionally, foam boards are great for prefab buildings because they are lightweight and easy to cut. Fiberglass is affordable and works well for larger steel garages and barns.

If you don’t have tools like a utility knife or protective gloves, insulation kits often come with everything included. You can also rent cutting tools or ask a contractor to install the insulation for you if your building is large.

Pro Tip: Always wear gloves and a mask when handling insulation materials, as they can irritate the skin and lungs.

3. Seal Gaps and Joints – Stop Leaks Before They Start

Small gaps in corners, joints, or around doors and windows can let in both water and pests. Over time, these little openings cause big issues. Using a good-quality sealant prevents leaks and blocks entry points. You can use silicone-based or polyurethane sealants because they last long and handle extreme weather. You can apply them with a caulking gun. Don’t have one? No problem. Most home improvement stores rent caulking guns or sell manual squeeze tubes that don’t need special tools.

Pro Tip: Do a visual inspection every 3 to 6 months. Shine a flashlight along joints during evening hours;  if light passes through, that area needs sealing.

4. Maintain Gutters and Downspouts – Direct Water Away

Your gutter system is your building’s first line of defense against rainwater. If it gets clogged with leaves or dirt, water overflows and pools near your foundation, which can lead to rust or leaks.

Use a small hand trowel or a gutter cleaning tool to remove debris. You can easily get them at many local equipment rental shops; they lend them for a few dollars a day. You can also use a sturdy ladder and gloves to scoop out debris manually.

Pro Tip: After cleaning, pour a bucket of water into the gutter to make sure it drains properly.

5. Ensure Proper Ventilation – Let Air Flow

Ventilation might not sound like a big deal, but it’s crucial for moisture control. When fresh air moves freely inside your metal barn or garage, humidity stays low. Without it, trapped air turns into condensation, which causes corrosion. You can install roof vents, wall louvers, or small exhaust fans. For small buildings, a portable dehumidifier works well too. Keep ventilation in mind during building installation and talk to the installers to ensure it is correctly installed.

Pro Tip: During humid months, keep windows open for a few hours daily to balance indoor and outdoor air.

Pest Control Tips

1. Keep Surroundings Clean – Don’t Invite Pests

If you keep the environment clean, pests will not be able to grow easily. Such an area is not favorable for pest growth. Rodents and insects are drawn to food scraps, open trash, or cluttered corners. So, don’t leave any edible items outside; keep them on shelves and in safe boxes where mice can’t reach them. Moreover, sweep your steel garage or metal barn regularly, and keep all feed, grains, or tools in sealed containers.

If you don’t have proper storage bins, recycled plastic or metal drums work just as well. Try to keep the clutter away from the walls; this trick helps control pest growth. This way, you can also spot rodent activity early.

Pro Tip: Use peppermint oil or vinegar spray near corners because pests dislike strong scents.

2. Seal Entry Points – Small Holes Are Big Problems

Mice and rats can enter through gaps smaller than a coin. Birds can enter through open vents. Check corners, window frames, and roof joints for holes. So, you need to seal them using caulk, steel wool, or fine wire mesh. But sealing windows is not a practical solution. What you can do is close them every time you leave the prefab garage after work.

If you don’t have sealing tools, you can use basic household materials like duct tape or weather stripping temporarily until you can seal it permanently.

Pro Tip: Check entry points at night with a flashlight; light leaks indicate open gaps.

3. Install Bird Deterrents – Keep the Roof Clean

Bird droppings can corrode metal over time. Installing simple deterrents like reflective tape, bird spikes, or netting helps. These are affordable and easy to install. If you are not comfortable doing it yourself, hire a handyman for a quick setup. One more thing you can do is install a vertical roof metal garage so that bird droppings slide off with water through its vertical panels.

Pro Tip: Avoid bird poison or traps. They are not safe for other animals. Use visual deterrents like owl decoys instead.

4. Manage Vegetation – Keep Nature at a Distance

Yes, you read that right!

Overgrown grass, shrubs, and vines near your prefab garage create hiding places for pests. Keep vegetation trimmed and maintain a 2-foot gap between plants and walls. If you love vegetation, keep it clean and trimmed; otherwise, it can become a mess on your property, which is only favorable for mice and other rodents. If you don’t have garden tools like trimmers or cutters, many local community centers in the USA have “tool libraries” where you can borrow equipment for free.

Pro Tip: Spread gravel or crushed stone around your foundation. It keeps weeds down and reduces pest hiding spots.

5. Use Natural Repellents – Safe and Effective

Why not use natural repellents? They are safe and effective. So, instead of harsh chemicals, try peppermint oil, citronella, or vinegar spray. They work well as natural repellents. Soak cotton balls in peppermint oil and place them near doors or vents. Rodents and insects hate the smell, and it keeps them away from your prefabricated structure. With this tip, you also don’t have to bear the smell of strong repellents.

Pro Tip: Replace the cotton balls every two weeks to keep the scent strong.

Maintenance Habits That Extend Lifespan

Some tips discussed above offer a permanent solution, while others are temporary due to the type of issue. You can’t go with a permanent solution for some problems; they just need regular fixing. Regular maintenance is what separates a rusty building from a long-lasting one.

Here is a checklist for regular maintenance habits:

• Inspect your building every three months.
• Look for rust, cracks, or watermarks.
• Touch up paint where needed.
• Clean your gutters and vents.
• Reapply sealant yearly.

You don’t need fancy equipment, just a ladder, gloves, and patience. If you can’t do it yourself, hire a local maintenance team once or twice a year. It’s a small investment that saves big money later.

If you are planning to build or upgrade soon, check out these metal building maintenance tips to understand in detail how to simplify maintenance in the long run.

Don’t Forget the Design

How can we forget the design? Yes, building design also affects your techniques to control moisture and pests. Choose sloped roofs so rain flows off easily. Add overhangs or extended gutters to direct water away. Opt for raised foundations to keep the structure above damp soil. Moreover, before finalizing your plan, consider reading about how to select the right metal building dealer who understands climate-resistant designs and can recommend the right features for your area.

Extra Smart Tips for Long-lasting Structures

Here are some more tips. They are extra, but carry the same importance as the tips we have discussed above.

• Keep humidity below 50% inside.
• Store only dry materials inside.
• Touch up any scratched paint to prevent rust.
• Avoid using bleach or acid cleaners, as they harm metal.
• After heavy rains, inspect the roof and foundation.

Also, while comparing metal building prices, remember that sound insulation, coatings, and pest-resistant materials may cost more upfront but save you a fortune in long-term maintenance.

Final Thoughts

Moisture and pests might seem like minor issues, but they can quietly shorten your building’s life. By following these simple and practical tips, you can protect your metal structures. Whether it’s a steel barn, prefab garage, or metal barn, you can protect them all with these tips. You don’t need to own fancy tools or be a pro. Just stay observant, maintain regularly, and act quickly when you see early warning signs. Prevention is always cheaper than repair.

If you don’t have a steel building yet and are planning for a new one, Viking Steel Structures can help. They provide high-quality prefab metal buildings designed to last for decades, with features like insulation and ventilation. These features naturally keep the pests and rodents away from the structure. They offer a wide variety of durable options to suit every need and budget.

Plus, they offer transparent pricing, flexible financing, and strong warranty coverage, so your investment stays protected for years. With their expert guidance at 877-801-3263, you can design a structure that not only looks great but also stands strong against nature’s wear and tear.