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Old 06-07-2022, 15:17   #1
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Join Date: Nov 2018
Location: San Diego
Boat: Shannon 50 Ketch
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Moisture barrier?

Sorry to ask more dumb questions, but...

We've ripped out the old freezer and reefer boxes, and now we have a big empty hole lined with marine plywood (see below).

Now, one idea I had been toying with was to build the new box and wrap it in insulation then place it in the hole. Not possible.

New plan is to lay down layers of insulation (Polyisocianate), working our way in from the sides till we have the right shape of the box, then assemble in place panels of FRP (thinking of getting 3/8" FRP panels from rParts for this purpose) and epoxy them together.

I have 2 or 3 questions -

1) what do I start with as a vapor barrier against the wood before I lay down the first layer of insulation? I'll be using polyIso (pink board) since the Aerogel idea fell through when I found out the cost. So I need some layer of plastic of some kind of foil between the wood and the first layer of insulation. What should that be made of (tyvek maybe?)?

2) what do I use to glue each layer together? I know I have to use something to glue each layer of insulation to the next - I've read something people use 3M 77 adhesive spray, someone else said they use contact cement, which seems very messy. What is the best way to do this?

3) do I need to seal the ends of each sheet of insulation? For example, by wrapping the edges with foil tape, to prevent moisture from entering? I think I read this somewhere, but I am not sure. Is this needed?

Thank you in advance!
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Old 06-07-2022, 16:10   #2
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Re: Moisture barrier?

Follow-up question - is this stuff okay? My local Home Depot has this for Polyisocyanurate, its not pink, its white. 1" = R6, 2" = R13.

https://www.homedepot.com/p/RMAX-Pro...7898/313501510

I'm planning on 4" for the reefer and 6" for the freezer. Is there a better source and why do they call it Pink Board if its not pink?
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