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Old 07-02-2019, 05:00 PM   #1
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Anyone had a broken window happen randomly?

Just curious I left for the weekend and came back to a rear side window that had shattered but left intact by the tinting.

No signs of impact or anything.

Marina owner says its possible for heat and then rainstorm or similar hot/cold to break them.. Also said we had a bad storm while I was gone.

Just really strange as they are original from 1979..
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Old 07-02-2019, 05:21 PM   #2
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Just curious I left for the weekend and came back to a rear side window that had shattered but left intact by the tinting.

No signs of impact or anything.

Marina owner says its possible for heat and then rainstorm or similar hot/cold to break them.. Also said we had a bad storm while I was gone.

Just really strange as they are original from 1979..
dock side?
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Old 07-02-2019, 05:36 PM   #3
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A bird maybe? I don’t by the heat hot/cold.
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Old 07-02-2019, 05:40 PM   #4
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Someone else’s bowsprit or anchor pulpit?
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Old 07-02-2019, 05:51 PM   #5
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I would work under the principal of an impact, maybe by a flying object during the storm. A deck chair striking the window with the bottom of one of its legs could have substantial force without leaving a scratch on the outside of the glass. An unsecured plastic kayak coming off someone's upper boat deck in the storm, could have tremendous force if the end struck the window. Lots of possibilities when the wind starts blowing.

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Old 07-02-2019, 05:55 PM   #6
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Single or double-thickness glass?
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Old 07-02-2019, 05:56 PM   #7
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I had a windshield crack spontaneously but it didn't shatter. If yours is tempered glass it probably took a pretty big whack to shatter.
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Old 07-02-2019, 06:01 PM   #8
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Greetings,
Well, it IS possible for temperature changes to cause shattering of tempered glass but not common.

Way back when, in chemistry labs with glass preparation/transfer systems, "spontaneous" breakage was more prevalent during thunder storms. These systems were built in situ and it was difficult to anneal any areas that had been hot worked. Residual stress was always present and even vibrations caused by thunder could initiate failure.
It could also possibly be that the window had been stressed for 40 years and picked this time to break.
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Old 07-02-2019, 06:28 PM   #9
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Mine are 1980. I had one spontaneously crack just after I got done tapping the weatherstripping back into place with a wooden spoon and a meat tenderizer. Honest.
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Old 07-02-2019, 06:45 PM   #10
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Old 07-02-2019, 06:51 PM   #11
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Had it happen to a rear window on our NorthAmerica pacific 39.

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Old 07-02-2019, 07:02 PM   #12
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Old 07-02-2019, 07:19 PM   #13
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Saw a dive mask lens that was left in the sun shatter upon contact with water. That was tempered glass.
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Old 07-02-2019, 07:45 PM   #14
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Quote:
Originally Posted by MurrayM View Post
Someone elseís bowsprit or anchor pulpit?
Not possible from the positioning of the boats unless one broke free and was retied.. Unlikely.

Quote:
Originally Posted by refugio View Post
Single or double-thickness glass?
Single.

Quote:
Originally Posted by Datenight View Post
Had it happen to a rear window on our NorthAmerica pacific 39.

Rob
At least that's something.. lol

I'm thinking bird, hail or something flying in the storm.. Gotta be replaced but just wanted to know what happened..

Just going to use lexan and hope it holds up until after this weekend.
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Old 07-02-2019, 08:24 PM   #15
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That happened to me. Southern California. Cool evening and very intense sunrise. 40 year old deckhouse Windows, clear glass. I just had them tinted dark. Boom - boom - boom

Three windows spontaneously cracked.

Hot and cold... thatís what did it. Expensive lesson learned by you and me both.
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Old 07-02-2019, 10:20 PM   #16
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My center windshield, 3/8" tempered glass shattered one chilly morning in the fall. The heat was on, it warmed the pilothouse up pretty nicely, and while having our morning coffee we heard the crack- like a gunshot. It took a few minutes to discover the source, until I looked out the windshield. The glass stayed intact, but spidered into small bits. I later discovered that the glass was tight in the frame, conditions were just prime that morning to cause the glass to expand in the frame and POW! Costly repair @ $800+, had to have a piece custom cut and sent out for tempering.
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Old 07-03-2019, 05:45 AM   #17
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" Costly repair @ $800+, had to have a piece custom cut and sent out for tempering."

If the glass is flat , some folks would just use automotive safety glass.

Only one trip to the glass cutters .

Tinting slows heat from entering the cabin by absorbing the heat , and if inside slowly radiating the heat.

Perhaps the tinting got warm enough to too rapidly expand the glass?
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Old 07-03-2019, 10:42 AM   #18
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Quote:
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" Costly repair @ $800+, had to have a piece custom cut and sent out for tempering."

If the glass is flat , some folks would just use automotive safety glass.

Only one trip to the glass cutters .

Tinting slows heat from entering the cabin by absorbing the heat , and if inside slowly radiating the heat.

Perhaps the tinting got warm enough to too rapidly expand the glass?
Possible but just strange that after all these years of them being tinted it happened now..

I honestly think it was the heat at this point.

I'm going to cut a piece of lexan and remove the glass in the mean time.. The frames on an old Mainship MK1 aren't just going to come out without a fight.

A further clue is this was the one window I had siliconed completely due to a leak in the frame.. That might be enough to keep it from expanding and I don't believe in coincidence.
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Old 07-04-2019, 06:15 PM   #19
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Happened several times on my boat and house.
Tinting and film increase heat. As others said repeated heating and cooling cause repeated stress. Any flaw or scratches or hardening of mounts become the starting point for disintegration into small pieces.
Any glass shop can cut and have it tempered.
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Old 07-05-2019, 03:04 PM   #20
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Happened several times on my boat and house.
Tinting and film increase heat. As others said repeated heating and cooling cause repeated stress. Any flaw or scratches or hardening of mounts become the starting point for disintegration into small pieces.
Any glass shop can cut and have it tempered.
Happened to our Carver 3207 one winter, sitting on jackstands in the boatyard. We'd check the boat about once a month just for kicks. Climbed under the cover and into the salon, crunch crunch, shattered glass everywhere. One of the windshields had shattered. I'm thinking it was maybe a temperature thing, still cold in the salon, sunshine on the cover, warm air between the cover and the glass. Big mess, cleaning all the glass bits out of the bilge (floor hatches were left open on purpose over the winter) and the a/c ducts took hours. Glass can be temperamental stuff.
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