The heat and sun do take their toll. Adequate ventilation will help extend the life of a roof. I also spray a long term once a year mildewcide / fungicide solution on my roof.
I think the average roof in florida should last between 13-17 years, dependent on weather trees are overhanging them, sun, ventilation, etc.
Overhanging trees also can hurt your roof.
On a side note, most roof vents in Florida are covered with lead. The squirrels like chewing the lead as it sharpens their teeth. This will allow water to get between the vent pipe and the lead shielding, thus causing water intrusion within the interior walls of your home. This could cause mold growth, etc.
One could buy some fancy plastic covers to go over the vents, but I've found that rows of clear silicone around the lead keeps the squirrels from chewing the lead, as they seem to hate the feel of the soft silicone. You should also keep tree limbs away from your roof so squirrels cannot get up there in the first place.
Frank
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The Plantation in Leesburg, just south of you good people. Love being a Floridian!
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