yes scott, saturation. one hive loss during winter months is one too many and i am not willing to chance losing a hive when using this material and bees when it could have been prevented. every winter is different but i want something that works during winter, every winter, and not something i am going to have to trudge out and check/replace and disturb a hive if it is saturated.
ray, like scott, i use 2" insulation and upper entrance. effective as scott said. this material (homasote) may work for you, just be aware of what can happen with it until you experience the loss of hive from it. if it gets soaked change it out. used to be you couldn't buy homasote except through big box building stores, and you had to buy an entire sheet and cut it yourself. now every beekeeping supplier is carrying it and selling it. few realize the potential downfalls of it. i have looked at a number of hives for new beeks here because they followed the advice of whomever to use these to find the homasote soaked and dripping. and the inner cover wet and moldy.
if you are using insulation above the homasote ray, and many beeks do, the insulation will do nothing to help your bees once this material is soaked. so now you aware of what can happen.
even a medium box with screen on the bottom filled with loosely packed straw works great to absorb moisture, and insulate.....i used this for some time, but got tired of dragging bales and boxes to the hives......
so back to capn's original question, about the dripping patty on the bottom board. post back capn, would like to know if you have direct sunlight on the outercover of the hive.....?