Alan Ambrose Posted July 13, 2024 Posted July 13, 2024 In 20 years time you may want to replace the panels (falling efficiency of older panels / lower cost / better technology available) and probably the trays (the plastic will be brittle and probably the wrong size for the new panels). That is, pretty much re-roof assuming you've crowded your roof with panels. At that time, might you may have wished you did the on-roof thing as that probably only involves replacing the panels and bolting them onto the old rails?
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