I have a double-pane window, downstairs on one end of the family room. It's
not very visible, being under the rear deck. Someone recently shot a small
hole, probably with a BB gun, which penetrated the outer pane. I'm looking
for advice on how to seal that up. I googled around, but surprisingly not
a lot there. Lots of articles on repairing broken windows or holes in
screens, but not this. Could not find anything on Amazon or on the sites of
Lowes or Home Depot. Any suggestions?
Thanks in Advance
Ideally you would replace the pane. You might check with a company that
repairs automobile windshields, and see if their process would work on
If you are willing to accept a visible repair, Epoxy might work. I
would prefer Silicone Rubber Glue or Sealant. Whichever, I would make
sure there was more than enough to fill the hole. After it cured I
would slice off the excess with a razor blade.
replying to clare, an angel wrote:
Thanks, I too will try that ; no point in replacement yet, evil is everywhere
and I am in the middle of it here. We don't have a black vs. white issue, but
sin in all trying to find its way out. Some people have bad attitudes and
control issues, get these straightened up and we could have a good America
again. People perish for lack of knowledge.
replying to Bob F, an angel wrote:
hi, I really need some help here; in my 70's and two windows with bb holes. one
is dry so I intend to try silicone and clear packaging tape. Other is full of
moisture; can I use hair dryer or shop vac to get exchange of air through the
long cracks without breaking glass to pieces. no point in replacing as yet. I
would really appreciate any help, thanks an angel that none seem to like. I
don't know much about even doing this, but nothing worthwhile is ever easy.
You can always get one of these for $900
Holes can be filled with resin, but I have no idea how well it works. Maybe
a local glass place will have what you need.
If appearance is not critical, I'd use epoxy.
You could patch the hole with clear epoxy, however, since the outside air
has got inside, the moisture in the air inside (unless you re in the desert)
WILL tend to condense onto the glass from time to time depending on
Perhaps we can dry that air. Before plugging the BB hole, we might drill
a hole in the glass seal with a tube to an aquarium air pump in a box
with a few Tyvek bags filled with desiccant clay...
Their ideas are good. Don't push it in much or it will run down or
reach the other pane, which won't look as good.
You could also use clear silicone cement like from GE. They might
have that in a hardware store but will definitely have it in a good
You have seen good ideas about epoxy, and I suspect the
concerns you have seen about the humidity of the air that
entered are correct.
But, you might be able to mitigate the condensation problems
if you were to heat the window some before applying the
I might try aiming some sort of space heater at the glass
for a while before doing the repair.
Even heating it slightly would lower the level of humidity
between the panes, and that would, in turn, lower the
temperature at which you would see condensation.
All the best,
Heating air lowers the RH but doesn't change the absolute moisture content,
so the air would have the same dew point after it cooled.
We might dry the air by running a tube from a dessicant box to the hole
and cycling the space heater every half hour for a few hours to pump air
out and back into the window cavity.
On 8 Oct 2008 06:48:04 -0400, email@example.com
No Physicist I, but at first, I thought, "Of course... He's
Then, on further reflection, (though I certainly may be
wrong) I came to see it differently:
The window used to be a closed vessel (and were that to
continue, your comment would, I believe, be correct.)
But now, it is an open vessel (the bb hole.)
Consider the analogy (though far more extreme) to a clothes
It heats the air in the drum, the RH goes down, the water in
the clothes is drawn to the air, and that moist air (with
the water it carries) is expelled by a fan via the duct.
It would appear to me that much the same thing would happen
in the case of the window:
A space heater (or some such) heats the glass of the window,
and after a few minutes, heats the air enclosed. As that air
warms, at least two things happen. First, as you say, its RH
drops. But in addition to that, it expands, expelling some
of that air via the bb hole, and with it, the moisture it
It seems to me that over time (and let's remember that the
volume of air in the window is extremely low) both the RH,
and the absolute humidity of the air in the window would
Then, when the epoxy seals the hole (while the window is
still warm) the AH within would be lower than the
surrounding environment thus lowering the temperature at
which condensation would be visible.
Might I have that right?
All the best,
Not unless the replacement air is drier than the air which one is trying
to displace -- which it isn't since it would be only some very small
fraction of air displaced by the volume expansion of a minimal amount of
The only way to make any significant difference would be the same way
the window was manufactured--draw a vacuum and fill w/ dry gas which
ain't gonna' happen.
Only real choice is to get the window repaired/replaced.
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