No junkyard or automobile wrecking yard not within an enclosed masonry building and not within a heavy industrial or unrestricted industrial district shall be operated or maintained for more than six (6) months after a zoning change to a use district within which such yard is not permitted; except, that in a light industrial district, where the planning and zoning commission determines that it is impractical to roof over a large area containing junk material or an automobile wrecking yard, the commission may permit the construction around such area of a seven foot (7') high masonry wall or substantial sightly tight or semitight fence, whichever in its opinion is the more appropriate in the surroundings of the property, and may then permit, for a specified time, the continued use of such property for such purposes. (Ord. 1204, 2002: prior code § 11-4-1(A)(10))