Satellite dishes can damage the roof from leaks if not properly sealed when installed. It is important to check that there is sufficient backing behind the roof sheathing for strength.

This nearby tree has overgrown onto the garage roof. Tree branches can reduce the life of shingles through wear from rubbing, as well as giving easy access to squirrels to run across your house and possibly nest in the eaves and attics.

Be careful of the "New Roof" listing. If I wouldn't have climbed this roof I wouldn't have seen that only half of it was replaced. The view from the ground had limited access to view the section on the right which was the original.

If the granular on your flat roof is not maintained, wind can move the stones and leave the membrane exposed. The UV rays will cause premature deterioration to the roof membrane. This one is cracking showing premature breakdown

When the eavestrough downspout from the upper roof drains directly onto the lower roof, the water will prematurely wear the shingles granular and reduce the life of the roofing system.

Sometimes on a home purchase, the prospective buyer needs to know that the roof is at the end (or close) to it's expected life such as this one. Having a home inspection should bring this information forward and let the client know what they need to budget for .