What? Oak Trees Produce Acid?
Do you have oak trees near your house? Have you noticed that the gutters have corroded rather quickly? Your oak trees are filled with oak galls containing tannin. Tannin is a very corrosive liquid when mixed with water, forming tannic acid that will eat through metal. Seriously.
In a relatively short period of time, your gutters could look like this.
This photo was taken in Cameron Park; if you are experiencing a similar problem, contact a contractor in your area. If you are in the El Dorado County, Sacramento County, or Placer County,