Sovereignty Module: Tile the Floor

Complete Clay Tile Floor Construction: From Clay to Paved Surface

Clay floor tiles are durable, beautiful, and made from local materials. This campaign covers tile forming, drying, firing, laying, and grouting.

Chapter 1: Tile Types

Chapter 2: Tile Forming

Slab-cut method (simplest): 1) Prepare clay body: 50% clay, 45% sand (fine), 5% grog (ground fired clay). 2) Wedge clay thoroughly (remove air bubbles). 3) Roll clay slab to uniform thickness (use guide sticks). 4) Thickness: 1/2-3/4 inch (thicker for floor tiles). 5) Cut tiles to size with straight edge and wire or knife. 6) Place tiles on flat boards to dry. 7) Flip tiles daily (prevents warping). 8) Dry slowly: 1-2 weeks (cover loosely with plastic first few days). 9) Tiles must be bone-dry before firing.

Press mold method: 1) Build wooden frame (mold) to tile dimensions. 2) Frame interior = tile size + 8-10% shrinkage allowance. 3) Dust mold with sand (prevents sticking). 4) Press clay into mold firmly. 5) Strike off excess with wire or straight edge. 6) Flip mold, tap out tile. 7) Repeat for each tile. 8) Consistent size and thickness.

Chapter 3: Firing

Kiln loading for tiles: 1) Stack tiles on edge (not flat) in kiln. 2) Use kiln shelves or tile setters to separate layers. 3) Leave 1/2 inch gap between tiles (air circulation). 4) Fire slowly: 100°F per hour to 400°F (drives off moisture). 5) Increase to 200°F per hour to peak temperature. 6) Hold at peak for 1-2 hours (heat soak). 7) Cool slowly: do not open kiln until below 400°F. 8) Total firing cycle: 24-48 hours.

Chapter 4: Tile Laying

Laying process: 1) Prepare subfloor (level, compacted gravel and sand). 2) Snap chalk lines for layout (start from center of room). 3) Dry-lay tiles to check fit and pattern. 4) Mix setting mortar (1 part cement, 3 parts sand). 5) Spread mortar bed (1/2-3/4 inch thick). 6) Set tiles into mortar, pressing firmly. 7) Use spacers for consistent gaps. 8) Check level frequently. 9) Allow mortar to set (24 hours). 10) Mix grout (1 part cement, 2 parts fine sand). 11) Press grout into joints with rubber float. 12) Wipe excess grout with damp sponge. 13) Allow grout to cure (48 hours). 14) Seal tiles with linseed oil (2-3 coats).

Chapter 5: Patterns and Layouts

Reference Card

1. Shrinkage must be calculated (clay shrinks 8-12% from wet to fired; tiles cut at 6 inches will fire to approximately 5.5 inches; calculate mold size accordingly). 2. Uniform thickness prevents warping (tiles of uneven thickness dry and fire unevenly, causing warping; use guide sticks when rolling and check thickness frequently). 3. Dry slowly to prevent cracking (rapid drying causes the outside to shrink while the inside is still wet, creating cracks; dry tiles slowly over 1-2 weeks). 4. Fire on edge, not flat (tiles stacked flat in the kiln can warp under their own weight; standing tiles on edge allows even heat distribution and prevents warping). 5. Start layout from center (starting tile layout from the center of the room ensures that cut tiles at the edges are symmetrical; starting from a wall often results in a thin sliver at the opposite wall). 6. Seal terracotta tiles (unglazed terracotta is porous and stains easily; sealing with linseed oil or commercial sealer protects the surface and enhances the color). 7. Grog prevents cracking (adding ground fired clay (grog) to the tile body reduces shrinkage and thermal shock; grog opens the clay body and allows moisture to escape during drying and firing). 8. Handmade tiles have character (the slight variations in handmade tiles create a warm, organic appearance that machine-made tiles cannot replicate; each tile is unique).