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Ludowici Interlocking Tile Installation Manual <br />15www.ludowici.com <br />Inspecting the Deck <br />• Ensure that the roof deck is clean, smooth and dry <br />before roof tiles are applied. <br />• Verify that there is no significant delamination, <br />warpage, bowing or separation from the rafters or <br />trusses. Check for deck rot. <br />• If deck is APA 3/4" rated plywood, check that panels <br />are spaced approximately 1/16" to a maximum of <br />1/8" apart for expansion and H-clips are used between <br />supports when the rafter spacing exceeds 16" O.C. <br />Unsupported end joints must be blocked. <br />• Make repairs to the deck as necessary. <br /> <br />Installing the Underlayment <br />Most problems with water-shedding roof installations oc- <br />cur from water that migrates through the joints of the tiles <br />through capillary action, wind-driven rain and runoff or ice <br />damming. Because of this possibility, the underlayment is <br />critical to the success of the roof. <br />At a minimum, all decks must be covered with two layers of <br />No. 30# asphalt-impregnated roofing felt or one layer of <br />No. 43# coated base sheet. <br />NOTE: Underlayment materials must be covered with tile as <br />soon as possible to prevent degradation from exposure. <br />If wood cant strips and nailers are nailed directly to the <br />deck, they must be covered with waterproof underlayment. <br />If nailed on the underlayment, they should be pressure <br />treated wood. <br />NOTE: All roofing underlayment materials should be carried <br />6" up all vertical surfaces. <br />For single layer of No. 43# coated base sheet: <br />Lay base sheet parallel to eave. Side lap - 2" and end <br />lap - 6". <br />Figure 15.1 Single Sheet Underlayment <br />Succeeding Courses of No. 43# Coated <br />Base Sheet Underlayment to be 36" <br />Wide (After Meeting Minimum Re- <br />quirements for Ice Damming) <br />Backnail Sheets <br />Wood Deck <br />Plies of Ice and Water Shield Underlayment Mate- <br />rial Installed Up to a Point 24" as Required Inside <br />the Exterior Wall Line of Building to Provide an Ice <br />Dam Protection Membrane <br />36" <br />36" <br />2" <br />NOTE: All dimensions are approximate <br />For Double Layers, follow these steps: <br />First apply a starter sheet of 1 layer of Ice and Water Shield <br />underlayment per manufacturer’s instructions. <br />Then completely cover the starter sheet with a full-width <br />sheet of No. 43# roofing felt. Lap succeeding sheets 19" over <br />the preceding sheets, leaving a 17" exposure (2" lap). End <br />laps should be a minimum of 6" (see Figure 13.2). <br />Preparing the Roof <br />Plies of Ice and Water Shield Underlayment Mate- <br />rial Installed Up to a Point 24" as Required Inside <br />the Exterior Wall Line of Building to Provide an Ice <br />Dam Protection Membrane <br />Wood DeckBacknail Sheets First and Succeeding Courses <br />of Underlayment to be 36" <br />Wide and Lapped 19" <br />Figure 15.2 Double Sheet Underlayment <br />NOTE: Prior to applying any roofing material, all con- <br />tractor work above the roofline must be completed. <br />36"17" <br />2" Side Lap