Coil Building: From Rolled Coils to Creative Forms

What You’ll Need

• Clay:
  • Stoneware or earthenware clay works best for coil building. Start with 1–2 lbs (450–900g) for a small project.
• Water:
  • A small bowl of clean water for moistening the clay.
• Sponge:
  • A soft sponge for smoothing and controlling moisture.
• Needle Tool:
  • Useful for scoring joints and trimming excess clay (optional).
• Rib (Optional):
  • A flexible rubber or metal rib for further smoothing.
• Plastic Wrap or Damp Cloth:
  • To keep your clay from drying out while you work.
• Work Surface:
  • Use a clean, porous surface (like a canvas or wooden board) to prevent the clay from sticking.

Step-by-Step Instructions

Preparing the Clay

• Wedging:
  • Begin by wedging your clay thoroughly to remove air bubbles and achieve a uniform texture. This step is crucial to prevent cracks during drying and firing.
• Rolling into Coils:
  • Roll small portions of clay between your hands to form long, even coils about 1 cm (or roughly the width of your pinky) in diameter. Aim for uniformity in thickness for consistent results.

Building the Base and Walls

• Forming the Base:
  • Lay out a small slab of clay to serve as the base of your piece. Alternatively, you can start with a coil arranged in a circular pattern to form the foundation.
• Attaching Coils:
  • Score the edge of the base and the end of your coil lightly with a needle tool to create a roughened surface.
  • Apply a small amount of water or slip to the scored surfaces, then press the coil onto the base. Ensure each coil is firmly attached by blending the joint gently with your fingers.
• Building Up the Walls:
  • Continue adding coils in a spiral pattern around the base. Work in small sections and maintain a consistent rotation to create even walls.
• Smoothing and Blending:
  • Use a damp sponge to smooth the surface and blend the coils together, ensuring a uniform wall thickness. If needed, use a rib tool to further compress and refine the shape.

Shaping and Refining the Form

• Adjusting the Profile:
  • As you build up the coils, gently shape the walls inward or outward to form your desired vessel (e.g., a vase, bowl, or sculpture).
• Rim and Base Refinement:
  • Refine the rim by smoothing it with your fingers or a sponge. Trim any excess clay along the base using a needle tool if necessary.

Drying and Finishing

• Controlled Drying:
  • Cover your piece loosely with plastic wrap for the first 24 hours to prevent rapid drying, which can lead to cracks.
• Gradual Air Exposure:
  • Over the next few days, gradually remove the cover to allow the piece to dry evenly until it is bone dry.
• Firing:
  • Once fully dried and stable, the piece is ready for bisque firing. After bisque firing, you may choose to apply glaze and then perform a final glaze firing.

Troubleshooting Tips

• Uneven Walls:
  • Work slowly and focus on maintaining a consistent pinch as you add each coil. If you notice thinner or thicker areas, gently adjust with your fingers before the piece dries.
• Cracking:
  • Ensure proper wedging and avoid rushing the drying process. If cracks appear, dampen the area slightly and smooth it out with a sponge.
• Poor Adhesion Between Coils:
  • Always score and apply a small amount of water or slip to each joint before pressing coils together.
• Collapsing or Sagging Walls:
  • If the walls appear too weak, allow the piece to firm up slightly (leather-hard stage) before adding more coils. This helps maintain structural integrity.

Enjoy!

Coil building offers a wonderful way to explore the creative possibilities of ceramics. This project teaches you the fundamentals of building form from simple rolled coils, while also providing the flexibility to experiment with shapes and textures. Remember, every coil you add is a step toward mastering your craft. Practice, patience, and careful attention to detail will help you create beautiful, consistent pieces that reflect your unique artistic style.

Happy Coiling!