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Ludowici Interlocking Tile Installation Manual <br />18 www.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 Vertical Lines <br />Vertical lines are chalked first. In the case of a hip roof, <br />the first line is struck in the center of the roof equidistant <br />from each hip. The remaining vertical lines are then struck <br />to the right and left at intervals equal to your average <br />width exposure x 5. Care must be taken to ensure that <br />all vertical lines are parallel to the water flow. For roofs <br />with gables at both ends the horizontal exposure should <br />be adjusted to work out to full tile or half tile to reduce <br />cutting. <br />NOTE: Vertical lines are not needed with random width <br />LudoSlate™ Premier or LudoShake™ Premier. <br />Figure 18.1 Ridge and Hip Stringer Detail <br />Underlayment <br />18" Strip of Ice and Water <br />Shield <br />Foundation Grade <br />Wood Stringer <br />6" <br />M <br />i <br />n <br />.