09/06/2026
🦪 FROM OYSTER SHELLS TO WALLS
One of the most recognizable features of the La Pointe-Krebs House is its tabby construction. Oyster shells are still plainly visible in portions of the walls today.
But creating tabby involved much more than simply mixing shells into mortar.
It began with lime.
Before Portland cement became widely available in the 19th century, lime was an essential ingredient in mortar, plaster, limewash and materials like tabby. Along the Gulf Coast, one readily available source of that lime was oyster shell.
To produce it, hardwood and oyster shells were carefully arranged in a structure called a lime rick. Once fired, the intense heat caused a chemical transformation in the shells, converting their calcium carbonate into calcium oxide, or quicklime.
The quicklime was then slaked with water. This created another chemical reaction, producing heat and eventually forming the lime needed for construction.
That lime could then be combined with sand, water and oyster shells to create tabby. The mixture was poured into wooden forms and allowed to harden into substantial walls.
It was a process requiring local materials, knowledge, skill, and a tremendous amount of labor.
And we don't have to imagine the result.
At the La Pointe-Krebs House, portions of those approximately 12-inch-thick tabby walls still stand today, nearly 270 years after the house was constructed in 1757.
The photographs here document the process recreated at the La Pointe-Krebs House, from building the lime rick and burning the shells to preparing the lime, mixing the tabby and seeing the historic walls themselves.
It is one thing to read about an 18th-century building technique. It is another to stand beside the walls it created. ❤️
Want to see more? For additional information, images and video of the process from start to finish, watch “LaPointe Krebs House – Making Shells into Tabby.”
👉 https://www.youtube.com/watch?v=IZdULKAEup0
🏛️ La Pointe-Krebs House & Museum
🕙 Monday–Saturday: 10 AM–5 PM | Sunday: 12–5 PM
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