screw heads condensing in house

A problem has surfaced recently that I would like your thoughts on:
I had a door installed where I had bay windows installed. The floor that the door is sitting on is extended to the outside (like most bay windows are framed). I snuck some into the joist area when remodelling my basement.
Anyway, the screws used to secure the door to the floor began forming water on them. My suspicion is that the screws extend into/near a cold area and with no thermal break they become cold and the warm indoor air is condensing on them.
Seeing the problem developing, I filled the screw holes in with wood putty. No good: now the condensation is on top of the putty. Anybody know why this would happen? Also, is there something I can do (or use) to make a thermal break between the screw head and the interior? As mentioned, I used putty, but it failed.
thanks
Edee Em I know the truth is out there, but I like to stay in....
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Hi, Do you have insulation on the canti-lever'd portion? If not, it's cold there. Screw is conducting that cold causing the water. Can you squeeze in expanding foam out of can around the screw underneath? Tony
edee em wrote:

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