Went outside today to put something in my houseboat parked here,one window completely shattered like someone through a rock through it. Went inside, no rocks,bullet holes,etc. It was completely closed up, and its close to 100 degrees here today. Was super hot inside, could heat do this?
Thanks.

It can, yes.

I had a new Ford Bronco parked in the driveway in summer, and the windsheild shattered.

Glass guy said he saw it quite a bit.

Was the broken glass on the inside or outside? If outside could be from the heat - expanding air on the inside blew out window.

Weed Eaters break glass

Glass can have very small defects of many different types and can do what you have described. Many commercial types are allowed small defects. Only mirror quality or its equilvalent is defect free

It could be.

But the glass guy told me it wasn't that that broke the bronco windshield. He said it was unevenly set, and expansion of the glass from the heat put too much pressure on the stressed point.

I had it happen years ago, Chevy truck

Thanks guys, I think it was the heat. Glass was on the inside and outside! I know about weed eaters breaking glass, just replaced a side window in my wifes Mini cooper a month ago, compliments of my DR trimmer!!

One of the glass tops on my vette blew up one night.
Car always sat inside if not being driven. It was intact when I went to bed. In a gazzilion pieces the next day. To this day, I have no idea what happened.

Probably Leprechauns.

I was going to say pitbulls.

On the other side of the coin I once dropped a half full stubbie (small glass beer bottle) onto a concrete floor base first, and it didn't break, and didn't spill the beer either. Someone was looking over me to get my alcohol intake that day...