Abstract: A louvered roofing assembly comprising at least one louver, which at least one louver includes a notch end and a sealing end. The at least one louver is movable between an open position and a closed position. In the closed position, the notch end of said at least one louver releasably engages the sealing end of an adjacent at least one louver to retard the passage of liquid and solid matter from an upper surface of the at least one louver to at or below a lower surface of the at least one louver. The notch end of a louver may include a “J” shape configured to accept in releasable engagement a sealing end of an adjoining at least one louver. The sealing end of the at least one louver may include a fin configured to releasably engage the notch end of the at least one louver.