Shell finish adds texture and charm - timing the exposure step is critical for a consistent look. Creating a high-quality tabby (shell) concrete finish - commonly seen in coastal regions - involves extra care during finishing to expose shells attractively.
- Site Prep: Clear, excavate, and compact the base just like a standard slab; good drainage is key to longevity.
- Formwork: Build sturdy forms that define the layout and maintain the desired slope for water runoff.
- Reinforcement: Place rebar or mesh to strengthen the slab and help prevent cracking.
- Concrete Pouring: Use a concrete mix (around 3,000–3,500 psi) with shells already mixed in or sprinkled on the surface.
- Shell Application: If not pre-mixed, broadcast clean, dry oyster shells over the wet surface, pressing them lightly into the concrete.
- Finishing: Wait until the surface begins to set, then wash or expose the top layer with water and a broom to reveal the shells without dislodging them.
- Curing & Sealing: Keep moist for proper curing (5–7 days), then seal to protect from moisture, salt, and stains.
