Okay, I'm leaning new things already.
No moisture issue here. So, so dry. When I moved back up here from San Francisco I had a cold that went into full on sinus infection and needing an inhaler and a misting cool air pump in my room. Never had asthma or breathing problems before. Why? IT IS SO DRY.

But I love it here, so I got over it.
That means any moisture build up in my hives is unlikely. I've read studies where raw wood burried in the ground even last longer here before rotting at the ground level and splitting because of the lack of moisture.
So, since I don't need the SBB for moisture reduction...what about the SBB ontop of a solid? Why or why not? Who does this and do they like it? I suppose it's a lot like the oil or vaseline traps, right?
I know price is a consideration -- most would choose not to use both bottoms because of price. But I have 2 hives, so the cost is piling up yet.
Today it's 70 degrees, cloudy, and 30mph winds. I want to rush out there and swap the bottoms because I'm so worried about the chilling! But really...bees in a crevice or rocks or a tree would have a wide open entrance even in poor weather.