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hewebb
Admiral

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USA
761 Posts
Initially Posted - 10/21/2013 :  04:48:58  Show Profile
The Admiral and I just spent five days on Lake Texhoma. Two of the nights the OAT went into the upper 30's and the inside of the boat was soaking wet. The forward hatch dripped on the V-berth and the bedding got wet. We were on the hook one night and in a slip the other night it did that. What do you guys do to keep the condensation at bay? The other nights were OK. I have a gas heater but only run it for a few minutes in the AM to take the chill out. Did not take the electric heater and could of used it when in the slip with power. The night it rained I had the boom tent up and it was OK. By-the -way, we had some very good sailing except for one afternoon then the wind was completely dead. I think the GPS should have read minus numbers.
1988 WK/SR w/inboard diesel Joe Pool Lake
Hobie 18 Lake Worth



Life is not a dress rehearsal. You will not get another chance.
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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts
Response Posted - 10/21/2013 :  07:47:33  Show Profile
I've had the same experience--rain falling from the overhead...

Do you have a solar vent? I may not have duplicated your conditions, but have found it keeps my cabin dry. As it pushes the damp daytime air (with my breath) out, it draws in outside air that has already dropped much of its moisture as dew. They are rated up to 1,000 cubic feet per hour, so I'd guesstimate it can change the air in your cabin in as little as half an hour.

I get up in the morning and the decks are drenched, but the inside of the cabin is dry. I also notice a constant buildup of mildew on the deck around the vent hood--evidence that the air being drawn out is quickly dropping its moisture there. Yes, it'll cool off the cabin at 30 deg. outside... Your alternative is enough heat keep the cabin liner above the dew point, and your breath is constantly increasing the dew point.
Edited by - Stinkpotter on 10/21/2013 07:51:51
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 10/21/2013 :  08:27:54  Show Profile
Something about the construction of the Catalina 25 makes it the worst boat for this I have ever seen. My current boat has carpet rather than a fiberglass liner and does not dew it. (he he) Would a Weems and Plath Yacht Lamp work to keep you dry? I have several friends who sleep with them lit.
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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts
Response Posted - 10/21/2013 :  10:27:40  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by pastmember</i>
<br />Something about the construction of the Catalina 25 makes it the worst boat for this I have ever seen. My current boat has carpet rather than a fiberglass liner and does not dew it. (he he) Would a Weems and Plath Yacht Lamp work to keep you dry? I have several friends who sleep with them lit.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">The worst would be a boat with no inner liner. The C-25 at least has a molded overhead liner--not just the back-side of the exterior fiberglass. Boats without that often use fabric or carpet overhead, which doesn't form water drops but invariably (from my observations) grows mildew from the moisture it absorbs.

Then too, if you don't sleep aboard, (1) you aren't adding moisture from your lungs all night, and (2) you aren't around at sunrise to see the startling results.
Edited by - Stinkpotter on 10/21/2013 10:31:22
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hewebb
Admiral

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USA
761 Posts
Response Posted - 10/22/2013 :  03:52:39  Show Profile
Dave

I do not have a solar vent. I think I will put that on my to-do list. I have seen them mounted in the plastic on the forward hatch on some boats. Normally we have things open for ventilation but in the cold weather that seems wrong somehow.
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Bill Holcomb
Admiral

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USA
769 Posts
Response Posted - 10/22/2013 :  05:47:46  Show Profile
Here's a couple ideas.
1) Get a couple of "Dry-Z-Air" dehumidifiers. Put one on the cutting board above the stove and the other on the counter that the head's sink sits on. These chemical dehumidifiers will help quite a bit. I've used them when I close up the boat between outings and have never had a mildew problem since I bought Snickerdoodle in 1985.....
2) Dave's solar vent ideas is A+.
3) Get a 12 volt fan (or even two) and mount them so as to push the air out the main hatch.
Bill Holcomb - C25 Snickerdoodle #4939
BTW - the Catalina 27s had a similar situation until the factory installed a couple of opening hatches with smokey glass in them the last couple of yeas before the 270 came into production - - one one either side of the mast. The moist air rises out of these vents nicely when they are open. I seem to remember that these were made by Bomar.
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cat25
Navigator

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USA
140 Posts
Response Posted - 10/22/2013 :  06:49:53  Show Profile
Eva-dry.com site has renewable dehumidifiers I have the E-500 model check them out.
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RAG Sailor
Navigator

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USA
144 Posts
Response Posted - 10/23/2013 :  20:01:05  Show Profile
Concerning the solar vent, I just took possession of my 1981 C25 and the vent was dead. It didn't work during the day and with no battery it didn't work at night. I called the company and told them that it was out of warranty but I noticed that the PO had replaced the whole unit about 3 years ago. The tech person told me that the solar array usually is good but the motor does die out. They sold me a new motor which also comes with new gaskets as well as new fan blades (in-take and exhaust-I'm running exhaust)for $25. It beat buying a whole new unit for $150 and a quick soldering job and now it works great. All I need now is the replacement rechargeable battery which Battery+ carries for $5.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.