ventilation

A man I work with was telling me today that it was suggested to him not to put the ventilation holes at the top, or not to worry about that, so much as, leaving a space at the bottom. He said he's since, while installing the floor board (having cut it short enough), leaving a 3/8" gap between the back of the floor and the back board. This allows incoming fresh air to rise through the floor and forces the hot air out of the top.

I asked him if he uses hardware cloth subfloors to deter blowfly larvae? He said no, but he'd check into it. The way I see it, that's a twofold plus for the birds. Not only do they have more ventilation from bottom to top, but the air would pass beneath the subfloor as well, moving even more air around inside.

I think I'll try that with my next batch of boxes. I have too many already waiting to be occupied to/nesting season's too close, to try and change the bottoms now.

Sounds like a plan, I don't see why that wouldn't work.