Solid Sheathing and Asphalt Shingles | The Building Code …
https://www.thebuildingcodeforum.com/forum/threads/solid-sheathing-and-asphalt-shingles.2097/
Sep 17, 2010 · If the roof has "spaced sheathing" (R905.7.1) with 1" X 4"s spaced, for wood shingles and/or shake; and the owner wants to change to asphalt shingles; then, the roof must be fully, "solidly" sheathed (R905.2.1); for example with plywood or osb sheathing. I nstalling asphalt shingles over the open spaces between the 1" X 4"s, is not an option.
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