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Net Energy and Time: a critical review | 26 comments (26 topical, editorial, 0 hidden)
Re: I came across this report (none / 0)
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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Net Energy and Time: a critical review | 26 comments (26 topical, 0 editorial, 0 hidden)
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