My docks are floating on plastic barrels - 55 or 30 gallon depending on the dock - these have had mixed results left in to ice-over during the winter. Some break, some don't. This year I'm having to replace 3 or 4.

But if you're talking about the actual foam floats, I can't see how letting them freeze in place would hurt a thing?

Dale

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"When tempted to fight fire with fire, remember that the Fire Department usually uses water." - anonymous