Winterizing your boat - SailNet Community
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post #1 of 7 Old 12-11-2015 Thread Starter
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Winterizing your boat

When you winterize your boat in preparation for haulout do you leave your thru hulls open or closed? ( I normally leave them all closed then once I haul out I go back and open the thru hulls to get the water out of the ball valves. )
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post #2 of 7 Old 12-11-2015
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Re: Winterizing your boat

I was just thinking about this the other day, that it might be better to leave them closed so as to prevent insects or whatever from climbing in from the outside, or building mud nests or anything of the sort. Luckily for mine, I have two - the sink which is constantly closed as there's no plumbing hooked to it. And the cockpit drains, which kinda have to stay open to ward off any snow or rain that might find a way in under the cover.

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post #3 of 7 Old 12-12-2015
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Re: Winterizing your boat

I leave mine open in case any residual water or condensation should run down into the valve body. Those that are unused and normally closed (overboard discharge, capped internally) get opened them closed.

FWIW I've seen what happens when a water-filled ball valve freezes (fortunately, it was just an irrigation pump, not on a boat) - the little cylinder of water in the stainless ball pushed the valve body apart, splitting it.




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Re: Winterizing your boat

Happens often when air temp in boat is much colder than the surrounding water. Thru hulls valves burst and boat fills when it warms up
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post #5 of 7 Old 12-12-2015
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Re: Winterizing your boat

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Originally Posted by brokesailor View Post
When you winterize your boat in preparation for haulout do you leave your thru hulls open or closed? ( I normally leave them all closed then once I haul out I go back and open the thru hulls to get the water out of the ball valves. )
In preparation for haul out, I leave them closed. I close my through hulls every time I leave the boat for more than a day.

After haul out I open them back up for the winter. After the last freeze I close them again, keeps the bugs from making nests and they are ready for launch!

Is it spring yet?
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post #6 of 7 Old 12-13-2015
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Re: Winterizing your boat

Ditto. Close before haul out, then opened on the hard to drain and dry. Not worried about bugs, once the winter sets in.

Those in humid southern climates, however, need to close their thru-hulls for serious bug issues. However, freezing isn't an issue for them.


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post #7 of 7 Old 12-14-2015
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Re: Winterizing your boat

Living in Northern Canada I have done my share of winterizing as we regularly see -40 and -50 in my area. In my experience always leave the valves open, as mentioned before if a small amount of water freezes in the closed body (whether residual, or trickle down) it can split it pretty easily.

Bugs aren't much of an issue in my area, but mice, squirrels, etc are. On all opening I have (exhaust, air, vents, and plumbing) exposed to the outdoors I put a small wad of steel wool in them. It easily pulls out during the spring de-winterizing, and mice\bugs will not chew into it. Make a checklist if you have to of where you plugged so you don't forget in the spring and leave it in the galley.

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