(a) The maximum coefficient of heat losses through building sections shall not exceed the following:
(1) Ceilings.
A. 0.05 for ceilings
(Insulation R-19) (Six inch thickness)
(2) Walls.
A. 0.07 exterior walls
(Insulation R-11) (Three and one-half inch thickness)
B. 0.10 wall between habitable space and unheated garage
(Insulation R-7) (Two and one quarter inch thickness)
(3) Floors.
A. Over unheated basements, crawl spaces, breezeways and garages-0.07 (Insulation R-13) (Four and one-eighth inch thickness)
1. A basement will be considered unheated unless it is provided with a positive heat supply equivalent to at least fifteen percent of the total heat loss of the living unit, or contains the heating unit and uninsulated ducts or piping.
2. A crawl space is considered unheated unless it is (a) provided with a positive heat supply equivalent to at least ten percent of the total calculated heat loss of the living unit or (b) contains uninsulated ducts or piping or (c) is used as a supply or return plenum.
3. A garage is considered unheated unless provided with a positive heat supply to maintain a minimum temperature of 50°F.
Crawl space plenums.
When a crawl space is used as a supply or return plenum, the perimeter walls shall be insulated with material providing R values as follows: Supply Plenum R-7. Return Plenum R-7 (Two and one quarter inch thickness)
(b) Design Temperature. The interior design temperature for habitable spaces shall be a minimum of 70° F with an outside temperature of minus 10° F.
(c) Concrete Slabs. Edge heat loss of concrete slabs around the perimeter of heated spaces shall not exceed a maximum value per lineal foot of exposed edge of 42 BTUH for unheated slabs and 50 BTUH for heated slabs.
(d) Total width or depth of insulation shall be twenty-four inches.
Insulation R. value for unheated slab 5.00
Insulation R. value for heated slab 5.00
(Ord. 4539-1974. Passed 4-16-74.)