you should use dummy boards straight away, really em.Wow! that was quick, thanks.
I can't add sealed brood from another hive and I will use dummy boards if it looks like they need it come the winter.
insulate under the roof as well, doesn't matter so much with the sides,you should use dummy boards straight away, really em.
place the nuc frames against one side of the BB add a frame of foundation on the end, then the dummy board, then as the bees draw the new frame out add another between the drawn one and the dummy, till they have filled the box, that way they are not heating excess un-needed "space"
I hate it when someone says in a few words what i've tried to get across and made a complete balls of.....I can't quite believe this "less air to keep warm" argument; that would only work if the dummy board formed a completely air-tight barrier from the top (crown board) down the sides of the brood box. It could be open at the bottom but, unless there were no gaps anyway else, the air would simply convect around and the bees would still end up heating the same air volume as if it weren't there.
I think the advantage of a dummy board is to keep the majority of bees from spreading themselves too thinly across multiple frames of foundation; we want them to finish one frame to a state ready for laying, rather than 3 frames a little bit, none of which the queen can yet use.
Surely, this must be right?
good job it wasn't "thenakedbeekeeper" who'd posted it.....I think you should think about it Firegazer as you think about your clothes. Air does move through them, but less than if you didn't have them on - same with dummy board, less air movement makes bees less stressed and use less energy regulating the temperature of the colony.
Now I'm thinking this example is a bit improper.
(frustrated Physicist who hasn't done any proper physics since University, 25 years ago, and now takes it out on his children and anyone on forums that mentions heat or anything to do with thermodynamics)