Remove all leaves, branches and other objects from your roof, which can cause damage by wearing away shingles. Trim any overgrown trees that are touching or close to your roof to prevent them from damaging shingles  and to prevent animals from having easy access to your roof where they can cause damage. Ensure your attic is well insulated and properly ventilated, which can keep ice dams from forming.

Check the accumulation of snow and ice regularly, especially after a heavy snowfall, and remove it. Hire a professional to do the job. Look at your roof after weather with high winds to see if there are any heavy limbs or other debris that have been blown onto your roof. Winter is also a good time to visually assess your attic ventilation. Uneven areas of snow melt can indicate your ventilation is out of whack. 

Walk around your house to get a good view of your roof and notice any signs of wear and damage to shingles, gutters, soffit, fascia, 

flashing, chimney and vents. Inspect the inside of your house for visible signs of leaks on all your ceilings and in your attic. Check that gutters and downspouts are free of debris and able to flow the rain away from your house. Check for signs of growing moss and algae.

Do a walk-around to notice any signs of wear and damage to shingles, gutters, soffit, fascia, flashing, chimney, vents. Check that gutters and downspouts are free of debris and able to flow the rain away from your house. Clean off any debris and fungal growth on your roof. Trim any overgrown trees that are touching or close to your roof to prevent them from damaging shingles.