F-Values for Below Grade Floors & Walls (Heated Basement)

Heat Loss by Perimeter Length (BTUH/*F/Ft.)***

Depth Below Grade in Feet

Wall Insulation (Floor Uninsulated)

R0

R4

R7

R11

R19

1'

0.84

0.58

0.54

0.51

0.48

2'

0.97

0.61

0.54

0.48

0.43

3'

1.06

0.65

0.56

0.48

0.41

4'

1.14

0.7

0.59

0.5

0.41

5'

1.22

0.76

0.64

0.54

0.43

6'

1.28

0.82

0.69

0.58

0.45

7'

1.34

0.87

0.73

0.61

0.48

Duct Losses per Lineal Foot

Rated Value of Duct Insulation

R0

R2

R4

R7

R9

R11

R19

kWh/ft.

18.8

9.2

4.3

2.8

2

1.7

1.2

Exterior Wall Insulation To 2-Feet Below Grade

R0

R4

R8

R10

F-Value (BTUH/*F/Ft)

1.28

0.92

0.82

0.79

Hydronic Pipe Losses per Lineal Foot

Nominal Value of Pipe Insulation

R0

R4

kWh/ft.

2.2

0.94

U-Values for Exterior Doors

Door Type

U-Value

Wood*

Without Storm Door

0.46

With Storm Door

0.31

Door to Buffer Space

0.41

Door w/Storm to Buffer

0.28

French Doors

Without Storm Door

0.61

With Storm Door

0.34

Metal Foam Core

Without Storm Door

0.14

With Storm Door

0.12

Door to Buffer Space

0.13