Does this roof need to be replaced or just cleaned with bleach?

[Tim Ivory]

Greetings.

If this post isn't allowed, I can delete it.

I was wondering if this roof is salvageable. I have no access to previous owner and permits don't show any roof work or anything for decades, so can't determine its age.

There are no leaks, no missing shingles. There is black mold but should be fixed easily with bleach.

Is this wishful thinking, or is the roof obviously gone.

Cheers