Wednesday, February 08, 2006
Tabby... Not Rock
This is a section of the old seawall along the bay in St. Augustine. You can find buildings of this material throughout the southern colonial coast. It is a form of primitive poured concrete called Tabby.
To make a Tabby wall, colonists built wooden forms, then prepared the Tabby. Oyster shells were gathered, heated and then crushed fine to make the cement that holds Tabby together. The cement was mixed with an aggregate of broken shells and then poured into forms. It wasn't reinforced and tended to crack, but there are many, many Tabby buildings from the 1700's still standing throughout the southeast.
Coquina, a natural shellstone is similar in appearance. The shells in coquina tend to be smaller and more uniform in size.
Posted by R.Powers at 6:00 AM