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Can roll roofing be placed over existing asphalt shingles if a rubberized roof coating/adhesive is used first?


The last time I knew NO You can put shingles over roll but not the way you wish.

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Personally I would not do it.

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Owens Corning does not recommend the use of roll roofing over any shingled roof. In our installation instructions we advise this in regards to the roof decking... "Roof Deck: The roof deck shall be dry, firm, smooth, and constructed of a minimum 3⁄8" thick plywood, 7⁄16" oriented strand board (OSB) or dry well-seasoned lumber, nominal 1" thick, not over 6" in width. Boards shall be laid close together and securely nailed. If plywood or OSB is used it should be as recommended by the American Plywood Association, Underwriters Laboratories Inc.® or local building codes. Plywood and OSB sheathing must be spaced a minimum of 1⁄8" and maximum ¼""

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