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The four types of roof sheathing are plywood, oriented strand board (OSB), planks, and tone-and-groove boards. The overwhelming majority of homes use the first two (especially OSB) and the other two are not often seen outside of special use cases. Methods of sheathing include solid sheathing, open sheathing where there are gaps, and plank sheathing. Most roofs are solid sheathing.

Skipping the installation of a drip edge or gutter apron can lead to significant water damage. Without this component, water is more likely to seep under roofing materials or leak behind gutters, damaging the fascia, soffits, siding, and even the interior of your home, such as the attic. Over time, this moisture can cause rot, mold, and deterioration. In colder climates, a missing drip edge also increases the risk of ice dams, which can lead to expensive repairs. A drip edge is an essential part of a roof's drainage system, and some local building codes may even require its installation to protect the home from water damage.

No, you can’t inspect the roof yourself if you want to get your roof certified for your mortgage lender or insurance underwriter. You’ll need to get it inspected by a licensed professional. If you happen to be a licensed inspector, this means that commercial rules apply, and you’d need to get your Remote Pilot Certificate, just as you would if using the drone for another business purpose. 

However, if you want to use a drone to simply check out the roof, it’s considered recreational use. You won’t need your Remote Pilot Certificate, but you’ll still need to register your drone with the FAA and follow FAA and any state guidelines during the flight.

Generally, snow guards are not required by building codes unless a local municipality has included them in their code. Even though they are not usually required, snow guards are highly recommended, especially for metal roofs in areas that see significant snowfall throughout the year. They act as a barrier to large loads of snow that can slide off a roof, potentially injuring people and damaging property.