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wrote:
> Hello.
>
> I am interested in building my own wine cabinet.
>
> I am a woodworker and I built my Dining Room set where the wine cabinet
> is going to live.
>
> I have come across the Breezair cooling units made for cabinets. It
> doesn't have much in the line of construction requirements though.'
>
> Can anyone here please give me a heads up on construction requirments.
>
>
> Is a couple coats of Polyurethane qualify as a 'vapor barrier'?

Probably, if you coat both inside and outside with it. The need for a
vapor barrier arises because the cooler temperatures inside will
condense water vapor out of the air, leading to an accumulation of
water. Because the walls of your cabinet will be cooler than their
surroundings, it's important that air can't enter the wood from either
direction, or you'll get dry rot fairly quickly.

Just my $0.02,
Mark Lipton