I have a simple question about EPS that I'm sure one of you can answer for me. Outside of buildings I encounter EPS in two places where it seems to act in very different ways. I see foam anchor buoys and fish floats off our coast and washed up on the beach that seem to maintain their buoyancy and lightness or years. But those of you with hot tubs will have noticed that the foam inserts gain weight over time and within a couple of years the initially light cover can easily triple its weight. If you remove the foam and leave it in a warm environment to dry it is reluctant to give up the water and it can take months to return to its original weight.
So my first question concerns what the difference is between the two? My second one would be what implications does this have for using EPS foam in damp environments? We generally talk about the perm rating of various types of EPS with regard to their ability to dry, but how much moisture do they hold if they can't dry and what is the effect of the encapsulated water on their insulating performance?
Posted Jul 10, 2014 8:58 PM ET
Edited Jul 11, 2014 6:59 AM ET
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