Originally Posted by ozmike
daddle, have asked question about suitability for freezer this was reply:
Hmmm. Okay. They must be using some sort of moisture barrier. Polyethylene sheeting of aluminum
foil. Or they didn't wait a year in a marine environment
I made one small mistake in earlier post. I meant Polystyrene foam not Polyethylene. Not STYROFOAM, but Expanded PS Insulation Board. Usually Blue boards at the building stores.
If moisture ingress is a problem. And it's a big one on boats of course. Bare PU is the worst choice. It will be 5% water
in a few years. Plus the gas they blow it with, which IS a great insulator, slowly leaks
out of the cells and is replaced with moist air. After months or years it will have no useful R-value.
Polyisocyanurate, found at building stores (tan color) is bad too.
Expanded PS foam is hydrophyllic. Water wants nothing to do with it.
marine refrigeration | All about marine refrigeration and more
Homegrown Power: refrigerator insulation
Expanded Polystyrene Vs. Polyurethane Insulation | Cooler Connection | Foodservice Blog Walk-in Refrigerators Coolers Freezers
Rigid Polyurethane Foam
On the lid sealing question: I used Butyl Rubber sticky backed weather
stripping. Kinda a heavy dense foam. 2mm thick, 10mm wide. West Marine
Cool tip: I lined my fridge with 6mm foam core
PVC board. Used for exhibit displays and the like. Very easy to work with. Ideal surface for durability and cleaning
. Sealed it with 5200....which gets a little grimy so there may be something better. Made the whole tapered double sealed lid with it by building it upside down on the workbench: formica, then plywood
then foam, then PVC. Then a 2mm temporary spacer. Then built the frame on that. It's beautiful.
Do not put a drain in the fridge. You will destroy the R-value with that tiny hole. Mop or pump the water out.