In this photo, you can see that someone put corrugated screw-down metal on the flat portion of this porch roof. This is an incorrect material and should have a commercial membrane. 

Here you can see that the granules are gone from the shingles, and the asphalt is exposed. We have exposed nails and moss, and algae buildup. These shingles are very brittle and well past their life expectancy. 

Here, you can see that the chimney flashing is in poor condition. It appears to have not been installed correctly with the previous roofing job, and the cap is insufficient. 

Here, you can see that the shingles are brittle and beginning to break off at the edges.

In this photo, you can see no drip edge installed on the roof when it was replaced. Over time, this has caused leaking and rot around the eaves and Gables and probably causing rot at the soffits. 

The vent boots are cracked and indeed leaking.

In this photo, you can see that the wall flashing is beginning to pull away from the house and likely causing some leaks.