House roof asphalt shingles maintenance process can be divided into three steps and performed twice a year
If you have a single story home, the safest (but limited) method of inspecting asphalt shingle roof surface would be from the ground, preferably with a pair of binoculars.
Inspecting asphalt shingle roof from the ground has significant limitations / because of the angle you’ll be looking at the roof surface, and detailed evaluation will not be possible. However, before you climb up the roof or start making any repairs, try to visually memorize any “out of ordinary” areas observed from the ground, continue to Step 2 to ensure that there’s a solid decking beneath the shingles, and come back outside to compare your observations.
While performing asphalt shingles maintenance look for: