Replacing Entire Roof
There are missing shingles missing shingles will need to be replaced right away.
Replacing entire roof. The downside is that. And while nobody likes having to pay to replace a roof the critical and aesthetic function it serves should help ease the pain of spending 8 000 to 20 000 on the work. If not replace bad wood with new plywood sheathing or 1 x 6 sheathing boards whichever is applicable to your type of roof. The shingles are missing pieces if a piece of a shingle is missing then the entire shingle will need to be replaced.
Replacing shingles due to wind damage or a fallen limb is a relatively easy and inexpensive. This can happen if a piece of debris has been blown into your roof thereby causing a piece of shingle to break off. So can you replace just part of your roof or is at an all or nothing deal. Well it depends on the level and expanse of the damage.
Make minor repairs on the roof if it is in good condition.