that just it! its just that bit too high... it has convection currents in it a bit lower and it wouldnt and would insulate better. People stuffing carpet in there in days of old were probably just making the air gap small enough to insulate despite the carpet being damp and orrible. just seems strange some one picked a thickness of wood just on the wrong side.Doesn't an air gap offer some insulation ?
In summer a metal roof can get very hot and cold in winter.
It's handy the size it is you can fit a block of fondant under the roof without an eke.
Who knows ? The strange ideas about beehives have been handed down from generations of mis-informed beekeepers ... probably just as JBM suggests or a measurement taken from a hive roof made in 1912 ...quite possibly!
Was there ever an idea of putting fondant or extracted frames up there?
The size of means its convects and it shows up on the CFD as a pretty pattern called Bernard Convections. So I have to talk about in my thesis, and show I understand the fluid mechanics. I need to put in the Bee keeping why as well. Note: If heat a shallow pan of cooking oil you can see bernard convection patterns.Who cares?
They certainly are not necessary, as has been said previously they add minimal structural strength. As I said flippantly earlier I am of the opinion that they are there purely to allow the air to circulate within this void and allow air to rise through the Porter bee escapes and exit via the meshed vents.We've bought economy dadant roofs from thornes in the last couple of years made of Russian redwood which don't have those battens at all so even thornes don't think they're a necessity.