1301.04 INSULATION STANDARDS.
   The “R” values indicated below apply only to insulating materials, and as used in this section, the term “R” (Thermal Resistance) is the numerical reciprocal of thermal conductance (R=1/c). It is a measure of the resistance of a material to heat flow; the higher the “R” value, the better the insulating value. “R” values per inch of thickness will vary for different insulating materials. Therefore, a given “R” value may require a greater or lesser thickness of insulation.
   Expressed in minimum “R” values, the minimum standards for insulating ceilings and walls shall be as follows:
 
Flat Roof   Exterior   Exterior   Exterior
Deck*   Masonry Wall   Frame Wall   Doors   Windows
   Construction   Construction
________________________________________________________________________________
      Ceiling      Wall   Ceiling      Wall   Stormed or      Stormed or
R-11      R-24      R-6      R-24      R-13   Insulated Type   Insulated Glass
   *Construction where rigid roof insulation and exposed structural system is used. When a roof cavity is available, use standards listed for ceilings.
   Minimum “R” values for floor areas over unheated basements, unheated crawl spaces or unheated garages:
 
Structural Slab   Wood and Metal Framing
   R-7         R-11
   A basement, crawl space or garage shall be considered to be unheated unless it is provided with a positive heat supply to maintain a minimum temperature of fifty degrees Fahrenheit.
   Insulation of floors may be omitted over heated basement areas or where the basement sidewalls are insulated at R-6.
   Foundation walls of basements need not be insulated except where habitable rooms are provided or where fifty percent (50%) or more of the wall section is above grade level.
   Slab-on-grade floors shall be insulated down the exposed edge and under the slab twenty- four inches, or down the exposed edge of the slab and along the inside of the foundation for twenty-four inches. In such cases, the insulating material shall be of the rigid type with a minimum “R” value of five.
(Ord. 1998-8. Passed 6-1-98.)