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lostdad75 t1_j5olrhh wrote

Porch and garage roofs collapse for two reasons; because they tend to be flatter plus they do not have heated living space underneath to help melt the snow

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siebzy t1_j5plh6u wrote

I would also guess that those types of structures aren't necessarily built with the same level of care or maintained as well as the main house.

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eljefino t1_j5rdtt9 wrote

When people add porches on they don't want to block the view from the second floor, nor the one from the first. So they need flat-ish roofs.

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