Rather than have black colored tops, I would just use 2" foamboard on top, it will do more good imo. I think wrapping the hive walls with tar paper is better for overall solar gain than having a black top.
I personally stopped using tar paper as it rains a lot here and the paper retains moisture. I don't wrap my hives anymore and have a better survival rate now. Some gives have insulated covers, but I don't see any difference in hives that don't have it.
The insulated covers had more condensation on the inside when compared to the normal ones. You cans see droplets on the insulation, but it falls onto the inner cover so it doesn't directly harm the bees.
Rader Sidetrack- I didn't know that, but I will see how it goes.
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