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Flashing is required at all wall and roof intersections, wherever there is a change in roof slope or direction, and around roof openings. When flashing is metal, it must be corrosion resistant metal with a thickness of not less than 0.019 inch (No. 26 galvanized sheet). (R903.2.)
Valleys must be lined in accordance with the shingle manufacturers written instructions. In addition, valleys may be of any of the following:
Crickets or saddles are required on the ridge side of any chimney or penetration greater than 30 inches wide. Cricket or saddle coverings must be of sheet metal or of the same material as the roof covering.
Flashing against a vertical sidewall must be by the step-flashing method. Flashing against vertical front walls, soil stacks, vent pipes, and chimney flashing must be in accordance with the asphalt shingle manufacturer’s printed instructions.