Campers get mold because moisture builds up in a small space full of cold surfaces. Cooking and showers add water vapor, and when that warm, humid air meets a cold wall, window or the underside of a mattress, it condenses, and mold grows wherever a surface stays wet. The EPA's cleanup guidance is to fix the water problem, scrub mold off hard surfaces with detergent and water, dry them completely, and throw away porous materials such as carpet that stay moldy. If the growth covers more than about 10 square feet or seems to be inside the walls, the EPA points you to its remediation guidance or an experienced professional. To keep mold from coming back, hold humidity below 60% (ideally 30 to 50%, per the EPA) and dry any leak or spill within 24 to 48 hours. No AIRLOCK product removes or prevents mold; cleanup and moisture control do that work.
Why campers get mold
The EPA explains that mold spores float through indoor and outdoor air all the time, and that mold starts growing indoors when spores land on a wet surface. None of the many types of mold will grow without water or moisture. That makes moisture the thing to control, and a camper collects plenty of it.
The EPA also explains that condensation forms when warm, humid air contacts a cold surface. A camper has a lot of cold surfaces close to the living space: windows and their frames, exterior walls behind cabinets and the dinette, and the mattress platform. Water that forms there every night and never fully dries is where growth starts.
Leaks are the other source. The EPA lists roof leaks and leaking or condensing pipes among the places hidden mold grows, and a camper has both a roof and plumbing running through its walls.
Is mold in a camper dangerous?
The EPA says molds have the potential to cause health problems. They produce allergens, irritants and in some cases potentially toxic substances. Breathing in or touching mold or spores may cause allergic reactions in sensitive people, such as sneezing, runny nose, red eyes and skin rash, and mold can trigger asthma attacks in people with asthma who are allergic to it. The EPA adds that mold can irritate the eyes, skin, nose, throat and lungs of people who aren't allergic too. If anyone in the camper has symptoms, the EPA's advice is to talk to a health professional.
Black mold vs white mold in a camper
The EPA notes that molds come in many colors, and its guide shows both white and black molds. Its cleanup and prevention steps are written for mold in general, with no separate method for a particular color. Whatever color you find, the steps below apply, and so does the size rule: under about 10 square feet is usually a job you can do yourself.
How to get rid of mold in an RV
These steps come from the EPA's Brief Guide to Mold, Moisture and Your Home.
- Fix the water problem first. The EPA is blunt about this: if you clean up the mold but don't fix the water problem, the mold will most likely come back. Find the leak, the wet cushion or the window that sweats every night.
- Protect yourself. The EPA recommends gloves, goggles without ventilation holes and an N-95 respirator to limit what you breathe in.
- Scrub hard surfaces with detergent and water, then dry them completely.
- Throw away porous materials that stay moldy. The EPA says absorbent materials such as ceiling tiles and carpet may have to be thrown away, because mold can fill the crevices and be hard or impossible to remove completely. In a camper, that can include carpet and padding.
- Don't paint or caulk over mold. Clean and dry the surface first, because paint applied over mold is likely to peel.
- Go easy on bleach. The EPA does not recommend chlorine bleach or other biocides as a routine part of mold cleanup. If you use a disinfectant, ventilate and exhaust the air outside, and never mix bleach with cleaners that contain ammonia, which can produce toxic fumes.
If the moldy area is more than about 10 square feet (roughly a 3 ft by 3 ft patch), or there has been a lot of water damage, the EPA points to its remediation guidance for larger jobs. For anything expensive or sentimental, the EPA suggests a specialist.
Mold in camper walls
The EPA says you may suspect hidden mold when a space smells moldy and you can't see the source, or when you know there has been water damage. It can grow on the back side of paneling and wallpaper, under carpet and pads, inside walls around leaking or condensing pipes, and in roof materials after a leak. Opening a wall to look can release a burst of spores, so the EPA suggests an experienced professional when you think mold is hidden.
An RV owner, in an AIRLOCK post-purchase survey, described exactly this: "Water damaged (mold between walls) truck camper." That kind of damage is a repair job, and the EPA's hidden-mold advice applies.
How to prevent mold in an RV
The EPA's summary is short: the key to mold control is moisture control. In a camper, that comes down to a few habits.
- Watch the humidity. Keep it below 60%, ideally 30 to 50%. A hygrometer tells you where you stand. See our RV dehumidifier guide for when an electric unit makes sense and how to size one.
- Vent moisture at the source. Run the roof vent fan while you cook and shower. The EPA points out that stoves add water vapor unless they are vented outside.
- Dry leaks and spills fast. The EPA says that when wet materials are dried within 24 to 48 hours, in most cases mold will not grow.
- Wipe condensation right away. The EPA calls condensation a sign of high humidity and says to dry the wet surface and reduce the moisture source.
- Keep the AC drip pan clean and its drain line flowing, which is on the EPA's prevention list.
- Keep closed spaces dry. Closets, sink cabinets and storage bays don't get much air. Desiccant bags such as AIRLOCK MoistureGuard soak up damp in those spaces with no power needed and no water to spill. MoistureGuard handles moisture in the space it sits in. It does not remove or prevent mold.
For the steps before a camper is parked for the season, see why RVs smell after storage.
What to put under an RV mattress to prevent mold
The goal is airflow and a dry platform. A mattress that sits flat on a cold platform fits the EPA's description of where condensation forms, where warm, humid air meets a cold surface. Lift the mattress regularly to check the underside and let it dry, keep the bedroom vented, and increase air movement around the bed, which is one of the EPA's condensation steps. If the underside is damp every time you check, the humidity in the camper is too high, and the fix is lowering it.
RV smells musty: what that smell means
A musty smell is a sign to go looking for moisture. The EPA says a moldy smell with no visible source is one of the reasons to suspect hidden mold, so check the places above before anything else.
Once any moisture problem is found and fixed, the smell can linger in the air. That is where AIRLOCK One RV and AIRLOCK Voyage RV fit. One RV mounts at the rooftop AC intake and eliminates odors in the air the AC moves whenever the fan runs, including musty air. Voyage RV plugs into a 12V socket or a wall outlet and works on odor in a small zone, such as a bathroom, with an odor removal range up to 4 ft.
Neither one removes mold, prevents mold or lowers humidity. Stephen W., an RV owner using AIRLOCK One, described the result: "The musty smell is gone and cooking smells have been eliminated."
RV AC smells musty
Start with the AC itself. The EPA's prevention list includes keeping air conditioning drip pans clean and drain lines unobstructed and flowing. If the smell continues after that, One RV eliminates odors in the air the AC moves whenever the fan runs. It does not replace the drip pan and drain maintenance.
What handles what
| Step or product | What it handles | What it does not handle | Source |
|---|---|---|---|
| Fixing the leak or moisture source | The cause; without it, the EPA says mold will most likely come back | Mold already growing (still needs cleanup) | EPA brief guide |
| Scrubbing with detergent and water, then drying | Mold on hard surfaces | Porous materials that stay moldy, which may need to be thrown away | EPA brief guide |
| Chlorine bleach or other biocides | Not recommended by the EPA as routine cleanup; sometimes used on professional judgment | Background mold spores (the EPA says some always remain) | EPA brief guide |
| Dehumidifier or air conditioning | Lowering indoor humidity | Mold already growing | EPA brief guide |
| AIRLOCK MoistureGuard | Damp in closets, sink cabinets, under-seat storage and storage bays | Humidity in the whole camper; mold | AIRLOCK MoistureGuard product page |
| AIRLOCK One RV | Odors, including musty air, in the air the rooftop AC moves whenever the fan runs | Moisture; mold | AIRLOCK One RV product page |
| AIRLOCK Voyage RV | Odor in a small zone, with an odor removal range up to 4 ft | The whole RV; moisture; mold | AIRLOCK Voyage RV product page |
Mold in camper FAQ
Is mold in a camper dangerous?
It can be. The EPA says mold can cause allergic reactions such as sneezing, runny nose, red eyes and skin rash, can trigger asthma attacks in people with asthma who are allergic to mold, and can irritate the eyes, skin, nose, throat and lungs even in people who aren't allergic. Talk to a health professional about symptoms.
How do I get rid of mold in my RV?
Fix the water problem, then scrub mold off hard surfaces with detergent and water and dry them completely, following EPA guidance. Wear gloves, goggles and an N-95 respirator. Throw away porous items such as carpet that stay moldy, and get professional help for growth larger than about 10 square feet.
What should I do about black mold in my camper?
Follow the same EPA steps you would for any mold. The EPA notes that molds come in many colors, including black and white, and its cleanup guidance doesn't change by color. For an area larger than about 10 square feet, or mold inside the walls, get professional help.
What about white mold in my camper?
The same EPA steps apply. White mold is still mold, and it still means a surface has been staying wet, so find and fix the moisture source along with the cleanup.
How do I get rid of mold in RV walls?
Mold inside walls usually traces back to water, and the EPA names roof leaks and leaking or condensing pipes among the usual sources. The EPA says opening a wall can release a large number of spores and suggests an experienced professional for hidden mold. Fix the leak as part of the repair, or the mold will likely return.
What can I put under an RV mattress to prevent mold?
Anything that lets air move under the mattress and keeps the platform dry helps. Lift the mattress regularly to let the underside dry, keep the bedroom vented and keep camper humidity under 60%. A damp underside is a sign the humidity is too high.
How do I prevent mold in my RV?
Control moisture. Keep humidity below 60% (ideally 30 to 50%), vent cooking and shower moisture, dry leaks within 24 to 48 hours, wipe condensation and keep the AC drip pan and drain line clean. Use desiccant bags such as MoistureGuard in closets, cabinets and bays.
Why does my RV AC smell musty?
Check the AC drip pan and drain line first; the EPA lists keeping both clean and flowing as a mold prevention step. If the smell remains after maintenance, AIRLOCK One RV eliminates odors in the air the AC moves whenever the fan runs.
Why does my RV smell musty?
A musty smell usually points to moisture somewhere, and the EPA treats a moldy smell with no visible source as a reason to look for hidden mold. Find and fix the moisture first. For the smell left in the air, AIRLOCK One RV and AIRLOCK Voyage RV eliminate odors. Neither removes or prevents mold.