Conventional methods of inspecting roofs include walking on the roof, viewing the roof from the ground or at the eaves with the use of a ladder.
Walking The Roof: This is the best conventional method for inspecting roofs. The problem with this method is that walking on the roof can cause damage to the roofing material and there are many types of roofs that cannot be walked on at all. Asphalt shingles is the most commonly used type of roofing material and walking on it greatly reduces the lifespan of the material, this is especially true in cold and hot weather. That means that 4 out of the 12 months of the year asphalt shingles should not be walked on.
Viewing the roof from the ground: This is another common method used by home inspectors. With the use of binoculars inspectors can get a close up view of the roof but a lot the time they can only see a small portion of the roof due to neighboring houses and other obstructions like chimneys, valleys, and peaks, etc.
Using a Ladder: This is also a common method used when a home inspector cannot go onto the roof. This method shares many of the same down falls as viewing it from the ground.
Using a Drone makes for a fast, efficient and safe way for home inspectors to perform a thorough roof inspection!