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Ludowici Interlocking Tile Installation Manual <br />19www.ludowici.com <br />Step 3: Chalking Horizontal Lines <br />Horizontal lines are struck after the vertical lines are struck. <br />Strike a line for the under eave tile. Subtract 2" (for <br />overhang) from the under eave to determine distance. <br />For Interlocking tile the first field tile line will equal the <br />average length of the tile minus the overhang (typically 2"). <br />Successive lines are then struck at intervals equal to <br />your average length of exposure. Length exposure of <br />Interlocking tile is determined by subtracting 3" (for <br />headlap) from the tile length. <br />IMPORTANT: <br />Tile dimensions can vary because of <br />clay firing temperatures. Be sure to <br />measure tiles in your shipment to <br />determine their average width and <br />length dimensions, so you can chalk <br />your roof properly. <br />Your eave to ridge measurement may determine the <br />average length exposure rather than the size of the tile <br />itself. <br />NOTE: Do not adjust exposure to a headlap less than 3". <br />Care must be taken to ensure that all horizontal lines are <br />perpendicular to the water flow. <br />Figure 19.1 Chalk Line Layout <br />Vertical Chalk Lines <br />First Field Tile Horizontal <br />Chalk Line <br />Second and Succeeding <br />Horizontal Chalk Lines <br />Under Eave <br />Chalk Line