I am in the beginning stages of updating the fridge/freezer on our '86 Hylas
47. I want to make this as efficient as possible, so I'm rebuilding the boxes with all new insulation
. After cutting out the inside liner I found that the original foam was very wet, so I'm glad I have gone to this effort.
did use a good depth
of foam around most of the box, but did not really do anything to create a moisture barrier other than lining the hull
surface with a thin foil. I want to make sure that the new foam I install stays as nice and dry as possible.
I am thinking of using a combination of polyisocyanurate foam board and spaceloft matt. I realize the polyiso board is not considered to be as moisture resistant as Dow blue board, but it does have a much better R value. My thought is to cut the board to the proper size, glue as many layers together as I can fit, then coat the exterior with epoxy
and a sheet of fiberglass
to make it totally waterproof. Do any of you have thoughts on this?
The two possible concerns I have is perhaps the epoxy
could damage the foam board in some way... or the epoxy and glass could possibly act somewhat as a thermal "bridge" with heat from one side riding around to the other side. Are these concerns worth worrying about?
For dealing with the aerogel spceloft, I am thinking of wrapping it in plastic sheetingthat gets all sealed up. An additional thought is that once the spaceloft blanket is all sealed up, cut a small hole into the plastic. I would then use my wet/dry shop vac to pull out as much air as possible before I quickly tape up the hole. Any thoughts there?
I will also lay down a new foil reflector sheet on the exterior surface of the insulation
to reduce radiated heat transfer.