1466.25  ROOFING MATERIALS.
   (a)   Tile, slate, asbestos-cement and asphalt shingle roofs shall be installed according to the manufacturer’s direction.
   (b)   Asphalt shingles which are classified “Class C” under the test specifications of Underwriters’ Laboratories, Inc., shall be accepted as meeting the requirements of this Building and Housing Code and shall be of the following minimum weight:
      (1)   Hexagon and square butt strip shingles:  235 lbs. per square.
      (2)   Individual shingles:  300 lbs. per square.
      (3)   Shingles without Underwriters’ label will not be permitted to be used under this Building and Housing Code.
   (c)   For slate, where installed, exposure shall not exceed the following:
      (1)   10-inch slate, not over 3-1/2 inches to the weather.
      (2)   12-inch slate, not over 4-1/2 inches to the weather.
      (3)   14-inch slate, not over 5-1/2 inches to the weather.
      (4)   16-inch slate, not over 6-1/2 inches to the weather.
      (5)   18-inch slate, not over 7-1/2 inches to the weather.
   (d)   Asbestos-cement shingles and tiles shall be applied with exposures as recommended by the manufacturers.
   (e)   Built-up asphalt and tar and gravel covering for flat roofs shall be applied according to the manufacturer’s directions and shall carry the regular manufacturer’s guarantee for the type of roof used.
   (f)   Wood shingles shall be tapered shingles, clear and free from defects for two-thirds of the length of the shingles as measured from the butts.  The combined thickness of each five shingles, measured at the butts, shall not be less than two inches.  The maximum area to be covered shall be 2,500 square feet.  Not less than twelve feet of clear distance shall be maintained between such building and adjacent buildings.
   (g)   Other types of roof covering, such as sheet metal, canvas, etc., may be used when the type and weight of the material and methods of application are approved by the Division of Building and Zoning Inspection.
   (h)   The placing of new roofing conforming to this Building and Housing Code over existing roofing shall not be prohibited, provided the existing roofing is removed for a distance of at least two inches along all drip edges of the roof and replaced by strips of weatherproof material over which the new roofing shall extend. 
(Ord. 42-1981.  Passed 2-23-81.)