Preventing Winter Damage to Your Deck

Posted by Darrell Nicholson at 11:13PM - Comments: (0)

Shipshape Canvas
Shipshape Canvas

A winter cover can go a long way to protecting your deck.

Of all the many evils that winter visits upon our boats—mold, mildew, snow, ice—one of the most insidious is also invisible. I’m talking about the water, soon to become ice, that could be trapped in the core of your deck.

If you had niggling leaks at your mast, your forward hatch, or deck hardware this summer, those niggles can become nightmares when freezing temperatures begin to do their damage.  Most decks these days are sandwich cores, which have a stiffening material, usually foam or balsa, or plywood, sandwiched between two fiberglass skins. (For a more in-depth picture of the pros and cons this construction process, check out our report on core construction.) For the moment, however, all you need to know is this: Once water enters the core of your deck through a small leak, it can often spread unnoticed. Bring on winter, and its freezing and thawing cycles, and the core begins to break down, and our light, stiff deck starts turning to Jell-O.

The freeze-thaw cycle can also break the bond between the fiberglass and the core, further weakening the deck structure and introducing new problems. In a worst-case scenario, you return to your boat in the spring and find bubbles, bulges, and cracked gelcoat or fiberglass where water has pooled and frozen, pushing your deck's outer skin upward.

Bottom line is this: Of all the winter maintenance you’ve got to deal with in the weeks ahead, take some time to address the leaks. Much of what you’ll need to carry out your own leak-repair project is here in our archives. Our most recent report on caulks and sealants can help you find the right sealant for the job. Owners of teak decks will want to consider our tests of teak sealants. For a good do-it-yourselfer perspective on sealants and caulks, checkout PS contributor Scott Rosenthal’s account of his seasonal assault on leaks aboard his boat Willow.

Better yet, if you want to prevent leaks to begin with, follow the time-tested technique for sealing through-deck penetrations to prevent leaks from reaching the core when you add or re-install deck hardware. Although not a complete guarantee against the scourge of winter, our boat winter-cover project can cut down on the damage done.

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