I saw the discussion on the soft spa cover and looked at some other sites where it was discussed and it got me to thinking.
One of the issues with foam covers is waterlogging. Two questions immediately come to mind. One -- why don't they make covers out of closed cell foam. I assume closed cell would not absorb water (I remember kick board when I swam and they NEVER soaked in water) Does anyone make such a cover. The second thought was sealing the bottom of my cover. Why can't I take some silicone (aquarium grade) adn glue on a piece of fairly heavy plastic on the bottom. Make sure it is sealed all teh way around the edge so moisture doesn't get under the plastic. The fold couldn't be covered but that would be a very small place for moisture to get in.
IF you put on a thermal blanket that sits directly on the water it seems like you would ahve the best of all worlds (in terms of spa covers anyway). Insulation directly on the water to minimize evaporation, a cover that can't absorb moisture, and an insulating layer of air between the foam and the cover.
I think I may patent this idea and become the oldest millionaire!! 8-)
Now the rest of you guys tell me why this isn't a great idea!!
Blessings on y'all,
Mike