How to Make Quicklime to Patch up an 800 Years Limestone Building

In this video, we will show you how a team builder uses a historical building technique to make quicklime and patch up a limestone construction that goes back to the 13th century. Not everyone would have known how to do this.

Quicklime, or calcium oxide (CaO), is derived from high-quality natural deposits of limestone or calcium carbonate (CaCO3). Limestone is a sedimentary rock that formed millions of years ago as the result of the accumulation of shell, coral, algal, and other ocean debris. Quicklime is produced when limestone is subjected to extreme heat, changing calcium carbonate to calcium oxide.

As early as 4000 BC, the ancient Egyptians used quicklime, after mixing it with water, as a construction material for building pyramids. Limestone was the main building stone of ancient Egypt. It's endlessly durable, lasting in buildings for thousands and thousands of years.

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