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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