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A comment on Why has the quality of brick buildings declined in the last 100 years?. Parent comment

Re:Why has the quality of brick buildings declined in the la... by douche on Saturday November 07, 2015 @10:01AM (#10524943)
I've never understood why people put asphalt shingles on new houses, instead of putting on steel roofing. It might be a hair cheaper, but the difference between shingle and the screw-on steel panels is not that much.

A.) Snow doesn't come off of shingles worth a damn unless you have a wicked pitch on your roof. So you have to get up and shovel off the roof, or risk icedams, leaks, and potentially the whole roof collapsing if you have really heavy snowfall.

B.) Shingles only last about 20-30 years. Steel roofing lasts a lifetime. You might have to repaint it once in a great while.

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Re:Why has the quality of brick buildings declined in the la... by burger_moon on Saturday November 07, 2015 @11:56AM (#10525312)
Steel roofs are a lot louder when it's raining and such, so it might have something to do with that. Also, they don't look as good (not so much for me personally, but in general) as a shingled roof. No question that they last a lot longer. I very often see large garages and barns built with steel roofs.
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Re:Why has the quality of brick buildings declined in the la... by alricb on Saturday November 07, 2015 @10:41PM (#10527356)
You should never have to shovel your roof; you should have a vented attic or enough insulation to avoid ice dams, and the structure should be strong enough to support the snow load.
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Re:Why has the quality of brick buildings declined in the la... by douche on Sunday November 08, 2015 @02:13PM (#10529445)
That would be a great ideal, but I've never seen it in practice. Probably with the truss-style roofs that are used commonly now, the snow weight is less of a problem than with the older rafter-style.

I'm unclear what point ventilation or insulation in the attic would have to do with ice dams... In my experience, it's caused by snow that doesn't get removed, which then melts, seeps down to the roof, and refreezes, with the texture of the shingles providing a greater surface area to freeze against.

All things being equal, it's nice to have a steel roof that will warm up on a sunny day and have all the snow slide off.

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Re:Why has the quality of brick buildings declined in the la... by alricb on Sunday November 08, 2015 @08:17PM (#10530895)
See: http://buildingscience.com/documents/insights/bsi-046-dam-ic...

The snow melts because of heat coming from the inside the house. [1]

So if you keep your roof cold through insulation and ventilation, you don't need to remove the snow (as long as the roof can handle it structurally)

[1]: http://www.erdc.usace.army.mil/Portals/55/docs/CEERD-RV/CEER... [pdf]

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