3 Ways to Prevent Mildew Growth Under Your Boat Cover

September 27th, 2011 | Posted by denise in Boat Covers | Winterizing

Boat Seat with Mildew Damage

Learn how to prevent mildew damage like this!

Protecting your boat with a boat cover is a smart decision but if you aren’t careful you can create the perfect environment for mildew growth.

The two things that mildew needs to grow is heat and moisture. When you enclose your boat with a boat cover, the temperature under the cover naturally rises.  Pair that rise in temperature with moisture from rainfall or humidity and you’ve got a breeding grounds for mildew.  Besides being a pain to clean, mildew can be bad for your health – aggravating allergies and causing all kinds of other respiratory problems.

1. Choose a Breathable Boat Cover Material

It is important to choose a boat cover material that compliments the climate in which you live in. If you live in a hot or humid area, it is essential that your boat cover is made from a highly breathable fabric like Performance Polyguard or Sunbrella. Both materials received a 5 out of 5 star rating in breathability.

2. Install a Vented Support Pole

A vented support pole provides the needed air flow to release heat that can get trapped under the cover and reduce moisture build-up. The vented support pole consists of two plates that twist and lock together on the top and bottom of the boat cover. These plates are designed to allow airflow but will not let water, like rainfall inside. It is important to note that you will have to cut a hole in your boat cover in order to install the vented support pole. To view the installation requirements, visit our YouTube video on Assembling the Carver Support Poles.

3. Use an Air Dryer or Dehumidifier

Air dyers are designed to reduce humidity levels in the air in order to reduce condensation (one of the factors that causes mildew growth). There are both electric and non-electric air dryers available in case your boat is stored in a location that doesn’t have electricity. Electric dehumidifiers, like the DryWave Boat Air Dryer, slightly raise the air temperature above the dew point to prevent mildew. Non-electric air dryers, like the Eva-Dry Dehumidifier, consist of a gel or crystals that collect and store moisture from the air.

As you prepare to winterize your boat this fall, consider these tips for preventing mildew growth under your boat cover.


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