Styrofoam vs fiberglass matt insulation
While I have my camper apart to do some structural repairs, I've been looking at its insulation. its basically 1" stryofoam sheets. My understanding is that the foam sheet isnt as susceptible to ...
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.....like Buzzcut suggests, don't fool about with anything other than closed cell foam. There are MANY block foam compositions out there. Check the PERM rating and compressive strength (ASTM D1621) for the foam FIRST before settling on ANY for product (Water Absorption, ASTM C272, % by volume, max: 0.3 or better) ! Also, if the better PERM comes from a thin plastic veneer over the foam board, ask yourself: what if this thin veneer is scratched, perforated or abraded? If this happens, then you have just usurped your PERM/vapor barrier spec!
Remember this: try and build a toy boat out of glass wool (if you can) and a 2nd toy boat out of XPS closed-cell block foam, drop them in the bath, and see which one survives after a few hours. Now, remove from tub, and dry both off with a hair drier (you've only got 1 minute to dry both: which one will not dry, even after days?).
When glass wool takes on even a small quantity of humidity (forget about water!), it will virtually lose ALL its insulating value.
Remember this: try and build a toy boat out of glass wool (if you can) and a 2nd toy boat out of XPS closed-cell block foam, drop them in the bath, and see which one survives after a few hours. Now, remove from tub, and dry both off with a hair drier (you've only got 1 minute to dry both: which one will not dry, even after days?).
When glass wool takes on even a small quantity of humidity (forget about water!), it will virtually lose ALL its insulating value.
