If your existing roof does not have plywood or OSB board on it then “yes” it does. Roof should be re-sheeted with 3/8 plywood to stabilize the deck movement.
Check to see if your drains are clean.
Some simple tips include keeping your water ways and drains clear, keeping valleys clear of debris and regulating moss growth (power washing is not recommended).
We no longer install gutters and downspouts, but we highly recommend Victoria Gutter. Contact Mark at 250-727-3042