Every year the winter takes its toll on your roof. Don't wait until your home is damaged by a leaky roof.
The first place to check is your attic. Look for signs of stains or spots. Also check the insulation for moisture. These could be signs of roof failure, ice dams, or condensation from a poorly insulated attic with improper ventilation.
From the outside look for areas that appear to be sagging compared to the rest of the roof. This is an indication that the underlying decking has weakened.
Other obvious signs are shingles that are cracked, curled or missing.
Inconsistent color could indicate granular loss from age. Also check inside your gutters for a build up of granules.
Also check your records to determine the age of your roof. Asphalt shingles, the most common type of material averages about 20 years.