How Acid Precipitation Damages Limestone And Marble Stonework

Before the advent of the smooth facades associated with modern skyscrapers, architects would design the exteriors of their creations with a variety of design details to help their buildings stand out. One unique element was the use of stone gargoyles whose superstitious origins were meant to offer the building protection from unwanted spirits. However, their true usefulness was in their ability to channel rainwater from troughs on their backs, out of their mouths, and away from the building.

Unfortunately, rampant industrialization is causing their demise thanks to the effects of acid precipitation.

Clean rainfall is slightly acidic, featuring a pH of approximately 5.6. Yet, when sulfur dioxide and nitrogen oxides mix with water, they form sulfuric acid and nitric acid, respectively. Featuring pH values between 4.2 and 4.4, these acids corrode limestone, sandstone, and marble buildings (or gargoyles). Should they crumble severely enough, pieces can plunge precariously upon unsuspecting pedestrians below.

The Coalition for Responsible Equitable Economic Development (CREED LA) proudly supports environmentally-responsible construction projects throughout Los Angeles that not only have a positive impact on the local community, but support LA’s working families as well.

CREED LA fights to ensure that developers pay fair wages to all the hard working construction professionals throughout the industry while simultaneously providing them with quality health care, continued training, and trustworthy retirement plans. To learn more about how our non-profit organization supports those building a better, greener world for us all, contact CREED LA at (877) 810-7473.