If you seal 25Celsius 70% humidity air in, and cool that down to 10Celsius,
you will have about 9grams of condensation per cubic meter of air.
In my view this is not too significant. You only will have problems, if
fresh humid air can enter, and more water condensens from the fresh air.
You can consider adding some silica gel (the one in inslulated window glass
panel frames) to the cavity.
Vajk
On Tue, Jul 9, 2013 at 12:35 AM, Peter Hollenbeck <pwhb...@gmail.com> wrote:
> Good points.
> All surfaces have at least two coats of epoxy. We may glass the interior
> surfaces as we have the exterior of the hull. If we use glass on all
> surfaces the process is: apply a thin seal coat of epoxy. Dry. apply
> another coat of epoxy, then immediately the glass, followed by a liberal
> coat of epoxy to saturate the glass and adhere it to the sealed plywood.
> Exterior surfaces have more epoxy to give a smooth base for paint.
>
> My 1wire system tells me the humidity 6AM to 3PM today is 53 to 80%, even
> though it is a nice sunny day. This because we are about 20 feet from the
> ocean water of the British Columbia Inside Passage and 30 feet the other
> way to the B.C. woods. So yes, we will have sealed in moisture and I thank
> you for pointing this out.
>
> When in the water the bilge should be quite cool, as the water temperature
> is about 10C year round. I don't know what bearing this has.
>
> Will I not have a baseline to measure against? Let's say the humidity is
> 70% when the bilge is sealed. I would take readings then and again after
> the boat is launched. Periodically thereafter I would take additional
> reading and expect them to be in the range of the original ones.
>
> I say again, OWFS is a great project with great participants. I follow the
> list and try to learn from it but sometimes don't understand a word.
> Thanks, Paul.
> Thanks, everyone.
>
>
>
> On Mon, Jul 8, 2013 at 11:20 AM, Don Veino <sourceforge_...@veino.com>wrote:
>
>> Looks like you have a nice project going. However, I'm going to guess
>> that no matter what you do, you are going to have liquid water inside the
>> compartments if you seal them shut.
>>
>> Why? Unless you are building the boat in a desert in winter, you will be
>> sealing in relatively warm and humid air inside the compartments. When the
>> boat is in the water, the compartments will cool and the moisture will
>> condense.
>>
>> Depending on the size of the compartments, the amount of liquid water
>> could be a few drops to something more significant.
>>
>> I'm projecting your construction technique to mean exterior epoxy coating
>> but likely not interior to the compartments. If so, then you have the
>> opportunity for interior rot with water contacting bare wood.
>>
>> I built a small trailer with similar construction that was very air tight
>> and ended up adding vents and a drain plug for this and other reasons. And
>> yes, I did play with the idea of installing a 1-wire network in the trailer
>> to monitor conditions and control some stuff. :)
>>
>>
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