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Re: Glass Cracking

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Could it be gas expansion between the panes?

Jesse D. Moore

----- Original Message -----
From: "Roger Turk" <73527.1356(--nospam--at)compuserve.com>
To: "SEAOC Listservice" <seaint(--nospam--at)seaint.org>
Sent: Thursday, August 22, 2002 1:52 PM
Subject: Glass Cracking


> Here's something that I hope one or more of you can give me an idea of
what
> is happening.
>
> Two windows in a 2-story frame residence, one on the second floor, the
other
> on the first floor.
>
> Window on the second floor is on the east side of the house.
>
> Window on the first floor is facing west, and under a porch overhang.
>
> Windows are double glazed, insulating glass.
>
> Interior pane on the window on the second floor has a parabolic crack
similar
> to the shape of the SEA logo.  Crack started at the left jamb, proceeded
up
> to the right, curved around and came back to the sill near the right jamb.
> Homeowner watched the crack develop and in 3-hours (8:00am to 11:00am) it
> progressed about 8-inches around the perigee.  (The homeowner marked the
> times on the glass.)  The exterior pane is undamaged.
>
> The owners report that the same type of parabolic crack occurred in the
first
> floor window, with the interior pane cracking, not the exterior pane.
(The
> first floor window has been repaired.)
>
> The house is about 2-3 years old and there is no visible sign of distress
in
> the house.
>
> Any thoughts, anyone???
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
>
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