ServiceNomad RV · Knowledge

Mold Growing Inside RV Cabinets

Mold growing inside RV cabinets is a sign of chronic moisture problems, poor ventilation, or hidden water leaks. Unlike mildew (a surface fungus that appears as light spots and can be wiped away), true mold grows into porous materials like wood and drywall and requires thorough remediation to eliminate. Mold not only damages the RV structure but also releases spores that can cause respiratory issues, allergies, and other health problems, especially in enclosed spaces like RVs.

Why Mold Grows in Cabinets

Mold requires three things: moisture, organic material (wood, paper, fabric), and warmth. RV cabinets are enclosed spaces with little airflow, making them ideal for mold growth if moisture is present. Common moisture sources include hidden leaks (roof, plumbing, windows), condensation from temperature differences, high indoor humidity (from cooking, showering, or wet gear), or storing damp items in closed cabinets. Cabinets adjacent to exterior walls are especially prone to mold because the wall surface is colder than interior air during cool weather, causing condensation. Slide-out cabinets are also vulnerable because slide seals can leak, allowing rainwater to enter the wall cavity and wick into cabinet interiors.

Identifying the Moisture Source

Before treating mold, you must find and fix the moisture source—otherwise, mold will simply return. A technician will inspect the roof above the affected cabinets, check window and door seals nearby, test plumbing connections (especially if the cabinet is under a sink or near a water heater), and use a moisture meter to map wet areas in walls and floors. If mold is growing on the cabinet back wall or in corners, suspect an external leak. If it's on the cabinet floor or lower sections, suspect plumbing or condensation. If it's widespread and the RV has been in storage, suspect ventilation failure and humidity buildup.

Mold Remediation Process

Once the moisture source is fixed, mold remediation involves removing all affected materials that cannot be cleaned (like particle board or drywall), treating remaining wood surfaces with mold-killing agents (diluted bleach, hydrogen peroxide, or commercial mold removers), and thoroughly drying the area. Porous materials like cardboard, fabric, or paper must be discarded—they cannot be effectively cleaned. For small areas (less than 10 square feet), DIY remediation with proper PPE (N95 mask, gloves, eye protection) is feasible. Larger mold infestations require professional remediation to prevent spore spread and ensure complete removal. The RV should be ventilated during and after treatment to remove airborne spores.

Preventing Future Mold Growth

Prevention is key. Keep indoor humidity below 60% (use a dehumidifier or ventilation fans). Avoid storing wet or damp items in closed cabinets. Leave cabinet doors slightly open when the RV is in storage to allow air circulation. Inspect and repair any roof or seal leaks promptly—water intrusion is the primary cause of RV mold. Run the exhaust fan during and after showers and cooking to remove moisture from the air. Consider using moisture-absorbing products (desiccant packs, DampRid containers) in cabinets during storage. Regularly inspect cabinets for early signs of mold or mildew and address issues immediately before they become major problems.

⚠️ Safety Notes

  • Wear an N95 respirator (not a dust mask) when cleaning moldy areas—mold spores are harmful when inhaled.
  • Never mix bleach with ammonia or other cleaners—this creates toxic chloramine gas.

💡 Prevention Tips

  • Use a hygrometer to monitor indoor humidity and keep it below 60% to prevent mold growth.
  • Inspect RV roof and seals annually and repair any cracks or gaps immediately.

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