How to Wedge Clay: Ram's Head, Spiral and Cut-and-Slam Methods

Knowing how to wedge clay properly before throwing saves you hours at the wheel. Wedging is kneading: it evens out soft and stiff spots, pushes out air pockets and lines up the clay particles so the clay moves smoothly. This guide covers the three common methods (ram's head, spiral and cut-and-slam), how to tell when you are done, and the mistakes that put air back in.

This page is research-based, drawing on Ceramic Arts Network articles, University of the Pacific ceramics course material, Digitalfire's reference glossary and teaching videos from TeachinArt. We did not wedge clay for it.

Why wedge clay?

• Even moisture. Clay stiffens unevenly in the bag, especially around the edges. Digitalfire notes that stored clay sets up over time and that "a few moments of wedging" mixes it back to an even consistency.
• Fewer air pockets. Pockets of air make lumps that throw clay off center and can show up as weak spots or bubbles in the wall.
• Aligned particles. Wedging lines up the flat clay particles so they slide past each other, which makes centering easier.
• Mixing. It is how you blend reclaimed clay, combine soft and stiff clay, or mix two clay bodies.

Pieces must still dry completely before firing. Wedging removes air; it does not make up for water left inside a pot that goes into the kiln too soon.

What do you use to wedge clay on?

You wedge on a firm, slightly absorbent surface that does not move when you lean on it. Before you start, set up the following:

• Surface: canvas stretched over a sturdy board, a plaster slab or a concrete block. The clay should grip the surface slightly without sticking. Plaster also pulls water out of soft clay, so do not leave clay sitting on it. A slick, sealed top such as a kitchen counter lets soft clay stick and smear, and a wobbly table wastes your effort.
• Height: a surface lower than a kitchen counter lets you put your body weight into the push instead of your wrists. Our wedging table guide covers surfaces and heights.
• Amount: 2 to 5 lb is easiest to learn with. Wedge throwing balls in the size you will use.
• Tools: a cut-off wire to check your clay and a scraper to clean the surface.

How to wedge clay step by step: ram's head method

Ceramic Arts Network calls ram's head the easiest method to pick up, and it is the one most classes teach first. The name comes from the shape the clay takes: two rounded "horns" on either side of a center ridge.

1. Pat the clay into a rough loaf shape, about as long as your two hands side by side.
2. Place your hands on the far upper sides of the loaf, heels of the palms on top and fingers wrapped around the sides.
3. Push down and forward with the heels of your hands, using your body weight. The clay stretches away from you.
4. Rock the clay back toward you with your fingers, lifting it slightly so the top rolls back over. Do not fold the front over onto itself.
5. Repeat: push down and forward, rock back. A ridge forms between your hands and the ends take the ram's head shape.
6. When finished, tip the clay onto its end and pat it into a ball or cone for throwing.

Spiral wedging

Spiral wedging (also called conch shell or Japanese wedging) rotates the clay a little with each push, so every stroke works fresh clay. The University of the Pacific course text describes it as less physically demanding than ram's head and equally effective at removing air. TeachinArt's demonstration notes it is especially handy for large batches.

1. Shape the clay into a rough cone or ball and set it on the surface.
2. If you are right-handed, press down and forward with the heel of your right hand on the right side of the clay.
3. Your left hand holds the left side and turns the clay a little toward you after each push.
4. Keep a steady rhythm: push, turn, push, turn. The clay forms a spiral of ridges that looks like a conch shell.
5. To finish, slow down and turn the spiral up onto its end, then pat it into a cone or ball.

Spiral wedging takes longer to learn. If the spiral keeps folding over on itself, go back to ram's head for a while.

Cut-and-slam (wire wedging)

Cut-and-slam, also called stack-and-slam or wire wedging, is the easiest method on your wrists. Michael Wendt, writing in Ceramic Arts Network, says he has used it for more than 30 years without wrist or hand trouble.

1. Block the clay into a rough rectangle. Wendt suggests at least 3 lb.
2. Lift it and cut it roughly in half with a wire.
3. Stack one half on top of the other without leaving dents in the faces you are joining.
4. Roll the stack toward you so the bottom is now on top, and slam it down to its original thickness.
5. Repeat. Wendt recommends at least 30 cycles.
6. Finish by shaping the block into a cylinder or ball for throwing.

This method is also the best way to add moisture to stiff clay (slice it and lay damp cloths or slices of softer clay between layers) and to blend two clays.

Wedging reclaimed or stiff clay

Reclaimed clay (scraps and throwing slop that have been soaked and dried back) is rarely even. Some parts stay sticky while the edges go firm. It always needs a thorough wedge.

1. Let reclaim dry until it no longer sticks to your hands. Clay that sticks to the canvas is still too wet to wedge.
2. If one batch is too soft and another too stiff, slice both into slabs and stack them alternately.
3. Use cut-and-slam to blend the stack, then finish with a few ram's head or spiral turns.
4. Cut the block with a wire to check that soft and firm layers have disappeared.

Clay that is far too stiff to wedge can be sliced, wrapped in a damp towel inside a sealed bag for a day or two, then wedged. The University of the Pacific course text describes the same slow rewetting approach and warns against adding too much water, which leaves the texture uneven.

Wedge with your body, not your wrists

Wedging done badly is hard on wrists and shoulders. Stand close to the table with one foot slightly ahead of the other, keep your arms fairly straight, and rock forward from your hips so your body weight does the pressing. Work in short sets and rest between blocks. If wedging hurts, switch to cut-and-slam, which uses lifting and dropping rather than repeated pressing.

How to check if your clay is wedged

• Cut it in half with a wire. The cut face should be even in color with no holes or slits. Any holes mean more wedging.
• Feel for even firmness. No hard lumps or soft pockets when you press around the block.
• Try two colors. Ceramic Arts Network suggests a learning exercise: wedge a light and a dark clay together. When the marbling is gone, the clay is fully mixed.

Common wedging mistakes

• Folding the clay over. Ceramic Arts Network warns that many beginners wedge more air in than they take out. Pushing and rocking, not folding, is the fix.
• Using your wrists instead of your body. Lean from your shoulders and hips with straight arms.
• Wedging too much clay. Large blocks wear you out and wedge unevenly. Split them up.
• Wedging too long on plaster. The clay dries as you work and becomes harder to throw.
• Letting crumbs dry on the table. Scrape the surface and wipe it with a damp sponge after each session so dried bits do not become dust.

What to do with wedged clay

Shape it into balls of the size you will throw, cover them with plastic, and use them the same day. Next step: how to center clay on the wheel, then the rest of the process in wheel throwing for beginners.

What you need

All you need to wedge is clay, a canvas or plaster surface and a cut-off wire. Our best clay for pottery guide covers smooth throwing clays, and our best pottery tools guide covers wire tools and starter kits.

Sources: Ceramic Arts Network, "How to Wedge Clay Properly" (Jeni Hansen Gard) and "Stack and Slam Wire Wedging" (Michael Wendt); University of the Pacific Ceramics course text (LibreTexts), "Preparing and Recycling Clay"; Digitalfire Reference Library, "Wedging"; TeachinArt, ram's head and spiral wedging lessons; Ceramic Arts Network community forum discussion on wedging new clay. Specs checked October 2026.