ANSWERS: 1
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Solar panels don't weigh much, just 2.5 to three pounds per square foot. Almost any roof can support them without extra reinforcement, unless the roof has extreme water or termite damage or is otherwise rotted.
Source:
Namastesolar.com: How Much Do Solar Electric Systems Weigh?
Solar.calfinder.com: How Will Solar Panels Attach to My Roof?
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