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Ludowici Interlocking Tile Installation Manual <br />16 www.ludowici.com <br />Ice Dam Protection <br />Ice dam protection is recommended in areas where the <br />January mean temperature is 30° F. or less and on all <br />pitches below the standard minimums. This protection <br />must be installed wherever there is a possibility of ice <br />forming along the eaves which will cause a back-up of <br />water and may cause building and interior damage. <br />Consider your local weather conditions. <br />Apply self-adhering Ice and Water Shield, or equivalent, <br />directly to the deck according to application instructions <br />provided with the product. Self-adhering underlayment <br />must extend up the roof to a point at least 24" beyond <br />the interior wall line and in areas of severe icing at least <br />up to and above the highest water level expected to <br />occur from ice dams (see Figure 16.2). <br />Please note that the 24" point beyond the interior wall line <br />is a minimum recommendation. Self-adhering Ice and Water <br />Shield underlayment should be applied to all roof decking, <br />which past history and professional experience suggest, might <br />be subject to ice dam back-up. If considering using ice dam <br />protection on the entire surface of the roof deck, insure that <br />adequate ventilation is present to prevent the development <br />of damaging condensation on the underside of the roof deck. <br />If a wide eave overhang requires flashing wider than 36", the <br />necessary 6" minimum horizontal lap must be located on the <br />overhang outside the structure walls. End laps must be a 6" <br />minimum. Underlayment should meet ASTM D-1970. <br />Figure 16.2 Ice Dam Protection <br />Ice and Water Shield Applied to a Minimum <br />of 24" Beyond Interior Wall Line <br />Concrete Deck <br />For Ice and Water Shield underlayments follow the <br />manufacturer’s installation instructions for attachment <br />to concrete. Or, if using asphalt felt, apply No. 43# coated <br />base sheet and fasten per the architect’s instructions. For <br />non-nailable concrete decks a counter batten system will <br />be necessary. Over the underlayment fasten a standard <br />pressure treated 1" x 2" furring strip vertically 20" O.C., <br />apply pressure treated 1" x 2" wood strips horizontally <br />across lath spaced to accommodate the correct tile <br />exposure and proceed as directed for a sheathed roof <br />(see Figure 16.1). <br />NOTE: Flashing dimensions will have to be adjusted to ac- <br />commodate the thicker assembly. <br />Figure 16.1 Batten System of Attachment for Concrete Deck <br />1" x 2" Furring Strip <br />20" O.C. <br />1" x 2" Furring Strip <br />at Each Course of <br />Tile