[Rhodes22-list] ...ventilation [on spray foam and other musings].
Michael D. Weisner
mweisner at ebsmed.com
Thu Feb 16 10:03:00 EST 2012
Chris,
At least label it as a "groaner". Oy!
Mike
s/v Shanghai'd Summer ('81)
Nissequogue River, NY
-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Chris Geankoplis
Sent: Thursday, February 16, 2012 9:53 AM
To: 'The Rhodes 22 Email List'
Subject: Re: [Rhodes22-list] ...ventilation [on spray foam and other
musings].
Gee Peter,
I'm a real fan of your solutions!
Chris
-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of peter klappert
Sent: Tuesday, February 14, 2012 9:33 PM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] ...ventilation [on spray foam and other
musings].
Another option is the Nicro day/Night solar fan. It can be mounted in the
fore deck over the rode locker (where it also draws off moisture from the
anchor rode). It's a compact & tidy addition on deck and doesn't get in the
way when you're at the bow. Given the small volume of the R22 cabin and the
amount of air that can come in even when the poptop is down & the companion
way closed, the Nicro provides great air circulation. It moves a lot of air
& runs around the clock because it has a rechargeable battery (which is
supposed to last 2 years). I got the 4" rather than the 3". I owe the
addition to Chris Cowie, who recommended it.
The Airhead composting head uses a small fan to vent the compost; it
draws very little. Still, were I doing it again I might also add the 3"
Nicro there (on the cabin top).
I had a boat cover made (eventually I'll post a few photos) & that would
cover a 2nd Nicro. BUT: I had vinyl windows added to the cover so that the 2
solar panels will function even when the boat is covered. I don't see why
there couldn't also be some kind of window & vented area in the cover for a
2nd Nicro.
Ventilation is especially important because I keep Aeolia is Florida
where it gets hot & humid. I also added 2 circulating fans inside the cabin:
one where the bulkhead meets the cabin wall on the port side, and one in the
v-berth positioned so it can either push air into the berth area or flush
air from the head. Neither draws much power.
----- Original Message -----
From: R22RumRunner at aol.com
To: rhodes22-list at rhodes22.org
Sent: Tuesday, February 14, 2012 2:05:21 PM
Subject: Re: [Rhodes22-list] ...on spray foam and other musings....
The key to decreasing condensation on a R22 is air movement. I doubt that
insulation would hold up very well in our small craft. Years ago I mounted a
small 12v computer fan behind a stainless steel cowling on the hatch.
Plugged into 12 volt and eliminated all the mold and mildew I had
experienced
previously. Much easier than insulation. There isn't enough exposed hull to
make it practical in my opinion.
Rummy
In a message dated 2/14/2012 11:50:02 A.M. Eastern Standard Time,
spreadgoodnews at gmail.com writes:
To decrease interior condensation. Now that i think more about it
tek-foil might be a better option.
On Feb 14, 2012, at 9:29 AM, R22RumRunner at aol.com wrote:
> Bob,
> I'm just curious, why would you want to insulate the interior hull of a
> R22?
>
> Rummy
>
>
> In a message dated 2/14/2012 8:32:59 A.M. Eastern Standard Time,
> spreadgoodnews at gmail.com writes:
>
> Thanks Rob. I am building out a 43' steel sailboat hull. I am
finishing
> the final interior epoxy coats now then i will spray closed cell
> polyurethane foam all over the interior hull over the stringers and
ribs. Then i
> have read i should spray a fire retardant elastomeric paint over the
foam to
> resist ignition in case of an interior fire. This foam will insulate as
well
> as contribute to the oxygen barrier of the epoxy.
> what kind of foam did boston whaler use in their hull construction? My
> friend has a bw dinghy hull that weighs about 300 pounds! Thats like 20
> gallons of absorbed water! My understanding of closed cell foam is
that if it
> is cut after spraying it will absorb some, but i am not sure how much.
I
> think the Rhodes has the good stuff in there like the foam that floats
> docks.(closed cell polyurethane?)
> Also is a pool noodle polyethelene foam? You can get that stuff in she
ets
> and it would be nice to insulate the rhodes interior hull with. It
wont
> absorb water either.
> Thanks,
> Bob
>
>
>
> On Feb 13, 2012, at 9:58 PM, Rob Granger <rgranger at sbc.edu> wrote:
>
>> Okay I didn't want to seem heavy handed when I stated before that I was
>> "almost certain" that Great Stuff is closed cell because there is a
lot
> of
>> controversy on this topic and to be fair, not all spray foams are the
>> same... but I'm a chemist and I felt it was necessary that we get this
>> straitened out since many of us are DIY boaters... so on the topic of
>> spray foam
>>
>> Some spray foams are latex and therefore open celled (DO NOT USE LATEX
>> SPRAY FOAM ON YOUR BOAT) but Great Stuff expanding spray foam is a
>> polyurethane-based foam and not a latex foam. So unlike the latex
spray
>> foams it is *closed cell*. And you should not be afraid of it
absorbing
>> water. It will (however) stick to the hull like ... well a
polyurethane
>> glue (think Gorilla glue). So the bag idea is the way to go if you
ever
>> want to get it out again... or line the area with visqueen before you
>> spray. I've used both approaches and they both work fine... I can
post
>> pictures if anyone wants to see the results of the bag or visqueen
>> approach.
>>
>> So to clarify, polyurethane foam (Great Stuff) is *closed cell*... so
it
>> is fine to use on your boat, even in low spots.
>>
>> The pink and blue foam boards at Lowes and HomeDepo are also great to
use
>> for floatation foam. They are *extruded* polystyrene and so they will
> not
>> fall apart into tiny little balls that make a mess everywhere... (Iike
>> cheap styrofoam will). I have about six 3" boards cut up and crammed
> into
>> my MacGregor 22'. And all of the little left over pieces are in a
bag,
>> crammed into a tight spot and filled with spray foam (along with some
>> packing peanuts I got in Christmas boxes this year).
>>
>> A note on packing peanuts. They're now two kinds. The old-school
kind
> are
>> made of styrofoam. Those are fine to use on a boat. The other type
are
> "*
>> green*" and made of cellulose. The cellulose peanuts will dissolve in
>> water. Obviously you do not want to use those. It is easy to tell
which
>> type you have. Drop one in a glass of water and wait a bit. Or you
can
>> bite one :-)
>>
>> If you are skeptical about the closed cell nature of Great Stuff
> expanding
>> foam...(and it is not a bad thing to be skeptical) you can read about
it
> on
>> the Dow Chemical site... you wont hurt my feelings if you do... I
promise
>> :-)
>>
>> Here is the link to the Dow Chemical site
>>
>> http://building.dow.com/na/en/products/sealants/windowdoor.htm
>>
>>
>> my 2 cents.
>>
>> ... the other Rob
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