Thx to George and all the others who replied.
As I anticipated the concensus is that it is the heated inside air
condensing water on the cool steel outer panel. Therefore tape-and-poly
sealing should be a big improvement.
The amount that would condense on the outside when the door is open, and
then drip inside, doesn't bother me too much. Right now I'm getting an
egg-cup or two from each section after say 5 days - the formed bottom of
each section [to hold the insulation slab] was holding water until it
ran over the lip when the door was opened.
I've been put off drilling holes after being told that typically these
doors have very thin, smooth galvanising [one trade name is satincoat -
to take a good paint finish] and drilling would most likely lead to
corrosion spreading under the coating and the paint. One expert did
point out that galvanised steel roofs are typically sheared and drilled,
thus exposing the un-galvanised edges - but they are, apparently,
heavily galvanised.
I let you all know how I make out.
THx again
Derek
George P. Dausch IV wrote:
>
> Derek,
> The problem is not the insulation/condensation, but in all probability
> the lack of a vapor barrier. The vinyl facing works, but if the edges
> are not sealed, instant condensation. Try vinyl or duct taping the inner
> lip of the doors to the vinyl facing, which should keep the moisture on
> the outside.
> Remember that when you raise the cold outside face into the heated
> ceiling, you'll still get condensation on the face, which will run over
> the edge and drip down.
> George
>
> On Fri, 17 Dec 1999 11:02:26 -0500 Derek Harling
> <derek.lola@sympatico.ca> writes:
> >
> > My "Race Shop" in my new home is the usual 20x20 domestic garage
> > dedicated to race cars and equipment [no dirty street cars allowed
> > inside!].
> >
> > The door is a modern, painted, galvanised steel, sectional lift up -
> > insulated with vinyl faced polystyrene foam blocks.
> >
> > On the few occasions I've open the big door in the past few months
> > I've
> > experienced considerable water running out - at the most
> > inconvenient
> > times and in the most inconvenient places - of course! At first I
> > thought it was rain water collecting in the space between panels but
> > it
> > turns out to be condensation on the inside of the steel panels -
> > [the
> > cold side of the insulation]. The water collects in the channel at
> > the
> > bottom and empties itself when the door section goes up and over.
> >
> > Any suggestions to stop it or to alleviate the problem?
> >
> > What about some small drainage holes - if the steel is galvanised I
> > shouldn't have a rust problem - right?
> >
> > Does anyone else have this problem?
> >
> > I live in the Detroit area so we have 3-4 months of winter. Maybe it
> > will get better as we get the colder, drier air in winter?
> >
> > What say the experts?
> >
> > Derek
>
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