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It probably depends on the expected life of the average roof.  European and Australian metal and tile roofs have 50+ year design lives.  American asphalt shingles have an expected 15 year life.
by njh on Sun Apr 1st, 2012 at 12:36:20 PM EST
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.. wait, what? 15 year design life is.. Not a house, that is a glorified cardboard box. You couldnt get away with building a summer cottage to standards that sloppy here.
by Thomas on Sun Apr 1st, 2012 at 05:26:53 PM EST
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