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Doubling the weight load on the roof just seems wrong and lazy.
I know the rest of the world or at least almost everywhere I have been uses cement shingle but they are very rare in the U.S.
In the U.S. we normally use asphalt composite shingles or steel for residential roofing.
Nothing like seeing a rickety shack buckling while holding up 9 tons of cement roofing.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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