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Ludowici Interlocking Tile Installation Manual: Lexington Slate & Century Shake <br />71www.ludowici.com <br />Measuring and Chalking the Roof <br />Layout and chalking the roof accurately are critical to <br />the roof’s performance and appearance. If the eaves are <br />straight and level, all horizontal lines must be parallel to <br />the eaves and all vertical lines must be perpendicular to <br />the eaves. Check the roof deck to determine if the deck is <br />square prior to layout. <br />Step 1: Determine Width and Length Exposure <br />Clay tiles, depending on the style and profile, vary <br />in exposure and recommended head lap. Ludowici <br />Interlocking tiles are laid with a minimum headlap of 3". <br />Before chalking the roof the installer should verify the <br />tile pattern being installed, and measure, noting average <br />length and width exposures of the tile shipped. <br />The width exposure should also include the spacing <br />gap between tiles. Interlocking tiles are typically laid <br />with a gap of 1/8"; however, this can be compressed <br />or expanded slightly. The usual overhang at the eave <br />is 2"; however, this can be compressed slightly to <br />accommodate full courses. <br />Step 2: 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 your <br />average length of exposure. Length exposure of <br />Interlocking tile is determined by subtracting 3" (for <br />headlap) from the tile length. <br />Your eave to ridge measurement may determine the <br />average length exposure rather than the size of the tile 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 />IMPORTANT: <br />The tile dimensions can vary because <br />of clay firing temperatures. Be sure <br />to measure tiles in your shipment to <br />determine their average width and <br />length dimensions, so you can chalk <br />your roof properly.