What Is Shellcrete? The Complete Beginner’s Guide

Published in: What Is Shellcrete | 8 min read

If you have been searching for a pool deck or patio surface that looks like you hauled the beach into your backyard, you have probably stumbled across the term shellcrete. But what exactly is it, and why is it generating so much buzz in Florida and along the Gulf Coast?

The Short Answer

Shellcrete is a decorative concrete surface made with crushed shell aggregate — typically oyster, clam, or mussel shells — mixed with white Portland cement and sand. When it sets and the surface is exposed, finished, and sealed, you get a textured, naturally coastal-looking surface that is incredibly durable, slip-resistant, and heat-reflective.

The Many Names of Shellcrete

Shellcrete goes by several names depending on who you are talking to and where you are: Shell Tabby, Tabby, Coquina Concrete, and Washed Shell Concrete. Each name reflects a regional tradition or aspect of the material’s character, but they all refer to the same fundamental product — concrete that gets its color, texture, and identity from real shell aggregate.

Why Is It So Popular?

Shellcrete has surged in popularity across coastal Florida and the Gulf Coast for several reasons. It stays cooler underfoot than standard concrete — an important feature for barefoot pool use. Its natural texture provides excellent slip resistance. And its one-of-a-kind appearance cannot be replicated by stamped concrete, pavers, or any other surface material.