What is wrong with this roof?

One of the main reasons this roof is in such bad shape is because the roof has been flashed incorrectly or not flashed at all, for that matter. This has caused a lot of wood to rot against the house.

Without flashing to protect the wood behind it. The wood will become rotted over time.

As you can see, all the red arrows are pointing to areas where the shingles are sliding down or beginning to slide down. A few things cause this. So when I checked, most of the shingles only have 4 nails instead of 6, plus it's a very steep roof. A lot of the nails were nailed above the strike zone. The shingle's strike zone or nail line is thicker in that section. So nailing above it can cause the nail to almost go right through the shingle.

This old chimney is falling apart and desperately needing some serious attention. It doesn’t appear that the chimney is in use.

As you can see, the existing gutters desperately need replacement.

This roof is not only steep but gets a lot of weather, and this is why we recommend an Owens Corning Duration shingle. The embedded Kevlar-like fabric will keep these shingles from sliding down the roof like the current ones and keep them in place for the roof's life. Here’s a short video to explain;