Cold frame?


Tonight I went and bought the necessary lumber to build myself a small
4 x 8 holding bed.  It'll be 24" deep on one end, and 18" on the other.

I'd like to have it double as a coldframe, but since I've never had the
space or tools to build one, I don't have _any_ experience whatsoever.
Can someone explain to me exactly how a coldframe is supposed to work?

What kind of material should be put across the top?  I thought of
treated plywood, 8 mil black plastic, 8 mil clear plastic, plexiglass,
and glass.  What's preferred?

Also, what needs to be done to assure proper watering?  Do I have to
go out and regularly water any plants that I'm overwintering?  What about
airflow?  I would guess that the coldframe should be opened on warmer winter
days...

Like I said, any info is appreciated.  :)

Thanks,

Chris
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