The Lyson poly hives come with a bottom board already premade with a screen bottom. There’s a small styrofoam tray that slides under, but it’s not snug and there’s plenty of air getting into the bottom brood box even with the tray in. Like 1/2 inch gap, :-)

Przemek

> On Dec 2, 2017, at 11:16 AM, Richard Cryberg <[log in to unmask]> wrote:
> 
> I recently attended a talk by Joe Latshaw on wintering nucs in polystyrene hives he buys out of Canada.  These have two inch walls so are well insultated.  Joe found them too hot in southern OH summers and too wet in winters.  His solution was to cut a hole large in the bottom with a saw and cover the hole with quarter inch mesh hardware cloth simply placed on the inside bottom and not attached. 

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