diff --git a/README.md b/README.md
index 74723da..51952b9 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ A lightweight, browser-based tool to build a tile library and paint reusable pat
 - Support rectangular tiles (multi-cell)
 - Pin a floor tile row at the bottom
 - Fill any row with a chosen tile
+- Apply a brick-block layout across rows
 - Auto-save tile library in the browser
 - Import/export the tile library as JSON
 - Export JSON for handing off to a tiler
@@ -59,5 +60,6 @@ Open `index.html` directly in your browser, or use the optional local server scr
 - Shift-click or right click to erase a tile.
 - Enable “Floor row” to lock the bottom row to a chosen tile.
 - Use “Fill row” to quickly paint a full row with a tile.
+- Use “Apply brick” to stagger rows in a brick pattern.
 - Tile library changes auto-save to your browser storage.
 - If you use image tiles, keep images square for best results.
diff --git a/app.js b/app.js
index ef3aef3..6e95017 100644
--- a/app.js
+++ b/app.js
@@ -19,6 +19,11 @@ const floorTileSelect = document.getElementById("floor-tile");
 const fillRowInput = document.getElementById("fill-row");
 const fillRowTileSelect = document.getElementById("fill-row-tile");
 const fillRowButton = document.getElementById("fill-row-button");
+const brickStartInput = document.getElementById("brick-start");
+const brickEndInput = document.getElementById("brick-end");
+const brickTileSelect = document.getElementById("brick-tile");
+const brickStaggerInput = document.getElementById("brick-stagger");
+const brickApplyButton = document.getElementById("brick-apply");
 const applyGridButton = document.getElementById("apply-grid");
 const clearGridButton = document.getElementById("clear-grid");
 
@@ -148,11 +153,13 @@ const setActiveTile = (tileId) => {
 const renderFloorOptions = () => {
   floorTileSelect.innerHTML = "";
   fillRowTileSelect.innerHTML = "";
+  brickTileSelect.innerHTML = "";
   const placeholder = document.createElement("option");
   placeholder.value = "";
   placeholder.textContent = "Select tile";
   floorTileSelect.append(placeholder);
   fillRowTileSelect.append(placeholder.cloneNode(true));
+  brickTileSelect.append(placeholder.cloneNode(true));
 
   tiles.forEach((tile) => {
     const option = document.createElement("option");
@@ -160,6 +167,7 @@ const renderFloorOptions = () => {
     option.textContent = tile.name;
     floorTileSelect.append(option);
     fillRowTileSelect.append(option.cloneNode(true));
+    brickTileSelect.append(option.cloneNode(true));
   });
 
   if (floorTileId && !tiles.some((tile) => tile.id === floorTileId)) {
@@ -167,6 +175,7 @@ const renderFloorOptions = () => {
   }
   floorTileSelect.value = floorTileId ?? "";
   fillRowTileSelect.value = activeTileId ?? "";
+  brickTileSelect.value = activeTileId ?? "";
 };
 
 const renderTiles = () => {
@@ -274,18 +283,75 @@ const drawGridLines = () => {
   patternContext.strokeStyle = gridLineColor;
   patternContext.lineWidth = 1;
 
+  const lastRowIndex = config.rows - 1;
+  const floorTile = floorTileId ? getTileById(floorTileId) : null;
+
   for (let row = 0; row <= config.rows; row += 1) {
-    patternContext.beginPath();
-    patternContext.moveTo(0, row * config.tileSize + 0.5);
-    patternContext.lineTo(patternCanvas.width, row * config.tileSize + 0.5);
-    patternContext.stroke();
+    if (row === 0 || row === config.rows) {
+      patternContext.beginPath();
+      patternContext.moveTo(0, row * config.tileSize + 0.5);
+      patternContext.lineTo(patternCanvas.width, row * config.tileSize + 0.5);
+      patternContext.stroke();
+      continue;
+    }
+
+    let segmentStart = 0;
+    for (let col = 0; col < config.cols; col += 1) {
+      const topId = grid[row - 1][col];
+      const bottomId = grid[row][col];
+      const shouldSkip = topId && bottomId && topId === bottomId;
+      if (shouldSkip) {
+        if (segmentStart < col) {
+          patternContext.beginPath();
+          patternContext.moveTo(segmentStart * config.tileSize, row * config.tileSize + 0.5);
+          patternContext.lineTo(col * config.tileSize, row * config.tileSize + 0.5);
+          patternContext.stroke();
+        }
+        segmentStart = col + 1;
+      }
+    }
+    if (segmentStart < config.cols) {
+      patternContext.beginPath();
+      patternContext.moveTo(segmentStart * config.tileSize, row * config.tileSize + 0.5);
+      patternContext.lineTo(patternCanvas.width, row * config.tileSize + 0.5);
+      patternContext.stroke();
+    }
   }
 
   for (let col = 0; col <= config.cols; col += 1) {
-    patternContext.beginPath();
-    patternContext.moveTo(col * config.tileSize + 0.5, 0);
-    patternContext.lineTo(col * config.tileSize + 0.5, patternCanvas.height);
-    patternContext.stroke();
+    if (col === 0 || col === config.cols) {
+      patternContext.beginPath();
+      patternContext.moveTo(col * config.tileSize + 0.5, 0);
+      patternContext.lineTo(col * config.tileSize + 0.5, patternCanvas.height);
+      patternContext.stroke();
+      continue;
+    }
+
+    let segmentStart = 0;
+    for (let row = 0; row < config.rows; row += 1) {
+      const leftId = grid[row][col - 1];
+      const rightId = grid[row][col];
+      const isFloorRow = floorEnabled && row === lastRowIndex;
+      const floorSkip =
+        isFloorRow && floorTile && floorTile.width > 1 && col % floorTile.width !== 0;
+      const shouldSkip = (leftId && rightId && leftId === rightId) || floorSkip;
+
+      if (shouldSkip) {
+        if (segmentStart < row) {
+          patternContext.beginPath();
+          patternContext.moveTo(col * config.tileSize + 0.5, segmentStart * config.tileSize);
+          patternContext.lineTo(col * config.tileSize + 0.5, row * config.tileSize);
+          patternContext.stroke();
+        }
+        segmentStart = row + 1;
+      }
+    }
+    if (segmentStart < config.rows) {
+      patternContext.beginPath();
+      patternContext.moveTo(col * config.tileSize + 0.5, segmentStart * config.tileSize);
+      patternContext.lineTo(col * config.tileSize + 0.5, patternCanvas.height);
+      patternContext.stroke();
+    }
   }
 };
 
@@ -430,6 +496,41 @@ const fillRowWithTile = (rowIndex, tileId) => {
   syncPatternPreview();
 };
 
+const fillBrickRows = (startRow, endRow, tileId, stagger) => {
+  const tile = getTileById(tileId);
+  if (!tile) {
+    return;
+  }
+  const maxRow = floorEnabled ? config.rows - 2 : config.rows - 1;
+  const start = clampNumber(startRow, 0, maxRow);
+  const end = clampNumber(endRow, start, maxRow);
+  const tileWidth = clampNumber(tile.width, 1, config.cols);
+
+  for (let row = start; row <= end; row += 1) {
+    const offset = stagger && (row - start) % 2 === 1 ? Math.floor(tileWidth / 2) : 0;
+    const toRemove = new Set();
+    for (let col = 0; col < config.cols; col += 1) {
+      const placementId = grid[row][col];
+      if (placementId) {
+        toRemove.add(placementId);
+      }
+    }
+    toRemove.forEach((placementId) => clearPlacement(placementId));
+
+    let col = 0;
+    if (offset > 0) {
+      addPlacement(row, 0, tile.id, clampNumber(offset, 1, config.cols), 1);
+      col = offset;
+    }
+    for (; col < config.cols; col += tileWidth) {
+      const remaining = config.cols - col;
+      addPlacement(row, col, tile.id, clampNumber(tileWidth, 1, remaining), 1);
+    }
+  }
+  renderCanvas();
+  syncPatternPreview();
+};
+
 const paintArea = (row, col, tileId, width = 1, height = 1) => {
   const maxRow = floorEnabled ? config.rows - 2 : config.rows - 1;
   if (row > maxRow || col >= config.cols) {
@@ -516,6 +617,9 @@ applyGridButton.addEventListener("click", () => {
   gridRowsInput.value = config.rows;
   gridColsInput.value = config.cols;
   gridSizeInput.value = config.tileSize;
+  fillRowInput.max = String(config.rows);
+  brickStartInput.max = String(config.rows);
+  brickEndInput.max = String(config.rows);
   initGrid();
   renderCanvas();
   syncPatternPreview();
@@ -550,6 +654,16 @@ fillRowButton.addEventListener("click", () => {
   fillRowWithTile(rowIndex, tileId);
 });
 
+brickApplyButton.addEventListener("click", () => {
+  const startRow = Number(brickStartInput.value) - 1;
+  const endRow = Number(brickEndInput.value) - 1;
+  const tileId = brickTileSelect.value || activeTileId;
+  if (!tileId) {
+    return;
+  }
+  fillBrickRows(startRow, endRow, tileId, brickStaggerInput.checked);
+});
+
 const readFileAsDataUrl = (file) =>
   new Promise((resolve, reject) => {
     const reader = new FileReader();
@@ -744,6 +858,9 @@ importJsonButton.addEventListener("click", () => {
     gridSizeInput.value = config.tileSize;
     floorEnabledInput.checked = floorEnabled;
     fillRowInput.value = "1";
+    fillRowInput.max = String(config.rows);
+    brickStartInput.max = String(config.rows);
+    brickEndInput.max = String(config.rows);
 
     tiles = normalizeTiles(payload.tiles);
 
@@ -824,3 +941,6 @@ loadLibraryFromStorage();
 renderTiles();
 renderCanvas();
 syncPatternPreview();
+fillRowInput.max = String(config.rows);
+brickStartInput.max = String(config.rows);
+brickEndInput.max = String(config.rows);
diff --git a/index.html b/index.html
index 44bbffa..6a0df55 100644
--- a/index.html
+++ b/index.html
@@ -97,6 +97,25 @@
             </label>
             <button id="fill-row-button">Fill row</button>
           </div>
+          <div class="control-group">
+            <label>
+              Brick start row
+              <input id="brick-start" type="number" min="1" max="100" value="1" />
+            </label>
+            <label>
+              Brick end row
+              <input id="brick-end" type="number" min="1" max="100" value="6" />
+            </label>
+            <label>
+              Brick tile
+              <select id="brick-tile"></select>
+            </label>
+            <label class="checkbox">
+              <input id="brick-stagger" type="checkbox" checked />
+              Stagger rows
+            </label>
+            <button id="brick-apply">Apply brick</button>
+          </div>
           <div class="control-actions">
             <button id="apply-grid">Apply grid</button>
             <button id="clear-grid">Clear grid</button>