Prevention of Mildew and Mold on a Yacht

A mold is a type of fungus which grows in moist areas in the form of a multicellular thread like structure. Mold has proven to be a big headache for boating enthusiasts. Even boats with well-ventilated and clean cabins can produce mold and the odor as there are many other areas on a boat which offers dark and moist environment best suitable for the growth of a mold. Thus, it is necessary to look under the v-berths, hanging lockers, quarter berths, lazarettes, settees and other hidden areas where you can’t reach with a cleaning cloth. The mold generation is due to the boat’s constant exposure to water. Humidity plays an important role in mold growth as humidity provides the right temperature and environment better suited for a mold.

Certain boat owners are afraid of using toxic chemicals and fungicides to remove molds as they may tend to damage the boat components. Hence, there are few methods of removing mold naturally without the use of chemicals, but for some areas, chemicals are a must as they grow on the surface and doesn’t get easily removed.

Removal of Boat Mold is better than cure. A mold doesn’t grow in well-ventilated areas, and it is necessary to ensure that your boat is very well ventilated. One can create cross ventilation by opening the portholes, or one can take the help of active and passive ventilators. These ventilators include louvered vents, cowl vents, ventilating sails and clamshell vents. Opening the portholes and hatches allows the air to pass in and out of the boat interiors, reducing the humidity content inside the boat.

Well, one cannot entirely remove mold from the boat, but for sure they can control the mold growth. It is difficult to eliminate molds entirely from the boat as once they are grown, they spread their spores everywhere on the boat and thus, to reproduce they just need a slight amount of humidity and temperature. They feed on materials containing the carbon atoms such as fiberglass hull, anchor rode and upholstery fabric which can be easily found on any boat. So, here are some boat mold removal techniques.

  1. This is an easy technique, and you don’t have to spend extra bucks also. Start by making a solution of water, powdered detergent, Tri-Sodium Phosphate, and bleach. Pour this solution into a spray bottle and apply it on the mold affected areas and gently scrub it with kitchen dish scrubber and quickly make it dry.
  2. After removing the molds, apply mold blocker. Mold Blocker is easily available in the market and doesn’t cost much. But remember, a mold blocker only lasts for some time. It is up to you that how well you maintain it.


  1. Additionally, you can apply calcium chloride crystals to remove excess moisture from the cabin. Set it up under the mold-prone areas such as the seats, the v-berths, hanging lockers, quarter berths, lazarettes, and settees.
  2. While using cabin heaters, it is necessary to open the boat’s hatches and portholes. This is because cabin heaters tend to increase humidity as the main components found in a boat cabin heater is either propane or diesel which on combustion generates by-products like water and carbon monoxide.

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