It may be too late now, or it may be done already. But...

If the sheet rock on the ceiling doesn't have a vapor barrier, it
should. Most of the water vapor in an attic area comes from the air in
the living space coming through the ceiling sheet rock. The water
barrier sheet rock has aluminum foil glued to the hidden surface.

Other fixes... Paint that surface with a water vapor paint. Or, paint
the inner surface of the ceiling with water barrier paint. The last is
the easiest to do.

Some history... I've built two houses and used the foil covered (alo
fire rated) sheet rock in both. In both cases the city building
inspectors told me it would cause the rafters to rot. They also disliked
foil covered insulation in an attic for the same reason. I think they
are wrong. Water vapor doesn't come into the attic from the outside and
go through the sheet rock to dissipate. The motion is normally in the
other direction. I have plenty of vents to the outside and much less
vapor coming through because of the foil. Our current home is 28 hears
old and the trusses are just fine.

I wonder if it would be effective, when building a geodesic dome,
drilling a number of holes through the triangular wood framing of the
roof and installing vents in some. The holes wouldn't significantly
weaken the structure and would allow air to move from one to another and
find its way out a vent. How did Bucky deal with this problem?

Bill

jloomis wrote:
He's dead......I tried....Apparently he died from "mold"
jloomis
"David F. Eisan" wrote in message
...

Call Bucky and see if he has any ideas...

David.