06-06
2. Overall "U" Value: The above recommended values should be used to
establish the overall "U" factor (Uo) for the building gross wall
area.
Designer A/E shall compute these values and demonstrate
that they do not exceed the limiting values listed below in Table
6.2.
Table 6.2
Degree-Days
Uo (Overall)
3000 & Below
0.36
3001 to 5000
0.31
5001 & Above
0.28
Uo = Uw x Aw + Ug + Ag + Ud x Ad
Ao
Uo = Overall Transmission Factor
Ao = Overall Gross Wall Area
Uw = Wall "U" Factor
Aw = Wall Area
Ug = Glass "U" Factor
Ag = Glass Area
Ud = Door "U" Factor
Ad = Door Area
Notes:
a. The roof or floor "U" factors and areas do not enter
into computation.
b. There are no specific requirements for the door "U"
values.
Insulated doors are recommended.
c. Perimeter Insulation: For heated occupied spaces, the
slabs-on-grade shall be thermally isolated by
providing perimeter insulation on the interior of
foundation walls. The requirements are listed below
in Table 6.3.
Table 6.3
Degrees-Days
Insulation Thickness
3000 & Below
1"
3001 & Above
2"
The insulation shall have "R" value (Same Units as "U") of
5.0.
B. EXISTING CONSTRUCTION: The designer shall examine the existing
building envelope and recommend the ways and means to improve its
thermal efficiency.
It is recognized that retrofitting the existing
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