What Can You Put in a Gun Safe to Keep Moisture Out?

If your hobby is collecting guns or hunting, you will need a gun safe to store your firearms. And the problem we get from hobbyists is that they want to know what to put in a gun safe to keep moisture out.

Sadly, most hunting areas are often in places with high humidity. And if the moisture level is too high or too low, your guns will malfunction or quickly get damage.

As per the National Rifle Association (NRA), the recommended humidity level for a gun safe is 30% to 50%. And a room temperature level of 70 degrees.

So if you want to know how to keep moisture out of safe, stick through this post. And you may read the best gun safe dehumidifier here.

ONNAIS Gun Safe - Biometric Gun Safe

hy Does Moisture Develop in a Gun Safe?

The truth is moisture is everywhere. It is not something our normal eyes can see. And storage places are not an excuse for that, no matter how tightly sealed they look.

The downside is when humidity develops in a closed space, it turns into mold. That is why the metal parts of the gun start to rust. This is very dangerous because the gun barrels might get stuck, which then could explode the firearm. 

What happens to the gun if the moisture is below the recommended humidity level? Fungi and other bacteria will start to form in the safe. This means it will be a health problem if you’re in contact with it through your guns. (1)

That is why the NRA concluded the safest humidity level for a gun safe is 30% to 50% at a room temperature level of 70 degrees. (2)

What to Use to Keep Moisture Out of Gun Safe?

Using a dehumidifier tends to be the best method to keep the moisture and dampness out of a gun safe. But, do gun safe dehumidifiers work? Its role is to extract water from the air and prevent metal corrosion and reduce and maintain the humidity level.

If you ask a professional, the recommendation is; desiccant, dehumidifier rod, or mini dehumidifier. However, there are do-it-yourself (DIY) options you can use to keep moisture out of the safe.

1) Use a sealant to prevent moisture

sealantAnother way to keep your safe dry is to seal any small holes or leaks in the safe. It is best to seal up such gaps so that moisture cannot penetrate through. Since doors are the most vulnerable to leakage, the safe’s door is the most familiar portion sealed up with sealants.

Sealants such as silicon, caulking, and foam are used to close the leak and other interior parts with minor holes.

2) Use under mat rubbers and epoxy

rubber matsPlace a rubber mat under the safe before bolting it down. Seal your rubber mat with epoxy and place it on the ground before mounting the safe. Rubber mats help to reduce the amount of moisture that reaches the safe in this manner.

How to Secure a Gun safe on the Ground to Minimize Moisture?

Another factor to remember when purchasing a gun safe is where you will place it. Choosing the perfect room with enough level of moisture is problematic. The safe’s position could affect the humidity it receives inside.

The standard choice for safe gun safe support is concrete flooring. Concrete floors are strong; they can withstand the extreme weight of heavy gun safes.

However, concrete or stone flooring produces moisture. If your gun safe directly lies on the flooring with no additional protective layers, the steel rots up over time, and the metal corrodes. Additionally, the rotten parts unnoticeably eat up a more significant portion of the metal safe, which will become a huge problem.

Another consideration is that if the gun safe is placed improperly, it can cause damage to both the floor and the safe. A gun safe pinned to an unpaved surface could jeopardize the safe’s placement. It lacks ground support, resulting in a power imbalance.

It would help if you also placed your safe on a comparatively solid and flat surface to maintain weight control.

If you want to elevate the safe slightly, you will want to build steel or concrete flooring anchors Just a few inches off the ground and makes it very durable with solid support so that it can withstand the weight of your gun safe. The high gun safe also eliminates the possibility of moisture accumulating from the bottom part of the gun safe.


What you simply need to keep the moisture out of a gun safe is a dehumidifier. An alternative method is putting a desiccant. However, if you are on a budget, you may try the easy DIY options we suggested here.

We love to hear your thoughts about this post by leaving a comment below. Suggestions and recommendations are very much welcome.

You may also want to check this learning guide on how to run power cord to a gun safe dehumidifier. Until next article! 


(1) Fungi and other bacteria – https://askabiologist.asu.edu/explore/puzzling-pathogens
(2) NRA – https://www.bbc.com/news/world-us-canada-35261394

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About John Fox

ebbb364ee14268bd3b77496cab3d1d78?s=90&d=mm&r=gCertifications: Certified Alarm Technician (CAT)
Education: Denver Security Academy
Lives In: Denver Colorado

John Fox has worked as a security consultant in Denver for over 20 years.
With Safe Now, he's taken those two decades of experience and decided to share it to help people online make the right security decisions for their businesses and families.

John writes security tips and guides, product recommendations, and prevention guides.

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