Air space
     Non-reflective
     Reflective
     Reflective fail
        2 reflective surfaces

314
314

1

0.72

0.99
0.29

1.01
3.48

1.39

Aluminum sliding over sheeting

1.61

0.61

Architectural glass

10.00

0.10

Asbestos-cement board

1/8
1/4

4.0

33.00
16.50

0.25
0.03
0.06

Asphalt roll roofing

0.048

2.27

0.44

Balsam Wood

1

0.27

3.70

Brick, Common

1

5.00

0.20

Brick Face

1

9.00

0.11

Built-up Roofing

3/8

3.00

0.33

Carpet and fibrous pad

0.48

2.08

Carpeting with foam rubber pad

0.81

1.23

Cedar shingle

1.11

0.90

Cellose, loose fill, blow in

1

0.31

3.25

Cellular board

1

0.35

2.86

Cellular glass

1
2

0.38

0.17

2.63
5.90 

Celluloses

1

0.29

3.50

Celotex

1

0.33

3.03

Cement fiber slab

1

0.50

2.00

Cement mortar

1

5.00

0.20

Cylinder block. Hollow

8
12

0.58
0.53

1.72
1.89

Cylinder block. Hollow
     With 112-inch oil plaster
     With 112-inch oil plaster

8-1/2
12-1/2

0.35
0.33

2.85
3.03

Clay tile
    Hollow. 1 cell deep
    Hollow. 1 cell deep
    Hollow. 2 cells deep
    Hollow. 2 cells deep
    Hollow. 2 cells deep
    Hollow. 3 cells deep

3
4
6
8
10
12

1.25
0.90.
0.66
0.54.
0.45
0.40

0.80
1.11
1.52
1.85
2.22
250

Concrete block
  Hollow
  Hollow
  Hollow with:
    Lightweight aggregate
    With ½ -inch of plaster
    With ½ -inch of plaster

8
12

8
8-1/2
12-1/2

0.90
0.78

0.50
0.49
0.45

1.11
1.28

2.00
2.04
2.22

Concrete, poured, sand And gravel aggregate

1

12.50

0.08

Concrete slab

4

3.13

0.32

Concrete wall

8

1.56

0.64

Cork board

1

0.30

3.33

Cork tile

1/8

3.60

0.28

Felt, vapor-permeable

16.70

0.06

Fiberboard sheathing

1/2
25/32
1

0.42

0.76
0.49

1.32
2.06
2.36

Fiberglass batt

1
2
3-112
6
8

0.30

0.16
0.091
0.053
0.04

3.30
6.30
11.00
19.00
25.30

Fiberglass, loose fill

1

0.91

1.10

Floor tile, vinyl etc

20.00

0.05

Glass fiber, organic bonded

0.25

4.00

Glass fiber board

1

0.25

4.00

Glass wool

1

0.27

3.76

Glass surface

2.00

0.50

Gypsum board

318
 1/2
 5/8

3.10
2.22
1.78

0.32
0.45
0.56

Gypsum plaster on gypsum Lath

1/2

3.12

0.32

Hardboard
      High density
      High density’s tempered
      Medium density

1/4

0.82
1.00
0.73

5.56

0.18
0.18
1.00
1.37

Hardwood

1

1.10

0.91

Hardwood floor

3/4
25/32

1.47

1.43

0.70
0.68

Linoleum or rubber tile

20.00

0.05

Mineral fiber, loose fill, blown in.
    Rock or glass
    Rock or glass
    Rock or glass
    Rock or glass
    Resin binder
    Loose fill, blown in
    With resin binder

1
1
3-3/4 to 5
6-1/2 to 8-3/4
10-1/2 to13-3/4
1
7-1/2 to10

0.31
0.38

0.29

0.29

0.05
0.03

3.25
2.60
11.00
19.00
30.00
3.45
22.0
3.45

Mineral fiberboard
   (Wet-felted) acoustical tile
   (Wet-felted) roof insulation
   (Wet-molded) acoustical tile

1
1
1
1

0.29
0.36
0.34
0.42

3.45
2.78
2.94
2.38

Mineral wool, batt

1
1
3 to 4
5-1/2 to 6-1/2
6 to 7 ½
9 to 10
12 to 13

0.31
0.24

0.091
0.053
0.045
0.033
0.026

3.25
4.16
11.00
19.00
22.00
30.00
36.0

Particleboard
    High density
    Low density
    Medium density
    Underlayment

5/8


1
5/8

1.18
0.54
1.94

1.22

1.22

0.82
0.85
1.85
1.06
0.82

Perlite, expanded
    Expanded, organic bonded
    Loose fill

1

1

0.33
0.36
0.37

3.03
2.78
2.70

Plaster

1

8.33

0.12

Plaster and metal lath

3/4

7.69

0.13

Plaster, cement, Sand

3/8
3/4
 1

5.00

13.3
6.66

0.08
0.15
0.20

Plaster, gypsum
     Lightwt agg
     Lightwt agg
     Lightwt agg
     Perilite agg
     Sand
     Sand
     Sand
     On metal lath

1/2
5/8
3/4

1/2
5/8
1
3/4

1.5

5.50

3.12
2.67
2.13

11.10
9.10

7.70

0.32
0.39
0.47
0.67
0.09
0.11
0.18
0.13

Plasterboard

3/8
½

3.10
2.22

0.32
0.45

Plywood

1/4
3/8
1/2
5/8
 1

0.80

3.20
2.13
1.60
1.29

0.31
0.47
0.62
0.77
1.25

Plywood(Douglas fir)

0.80

1.25

Plywood or wood panels

3/4

1.07

0.93

Plycarbonate sheet

1/8
3/16
1/4
3/8
1/2

1.06
1.01
0.96
0.88
0.81

0.94
0.99
1.04
1.14
1.23

Polysiocyanurate,cellular

1/2
1
2

0.278
0.139
0.069

3.60
7.20
14.40

Polyisocyanurate,smooth skin

1

0.14

7.20

Polystyrene
       Cut cell
       Expanded, molded beads
       Foamed in place
       Smooth skin(Styrofoam)

1
1
1
1
1

0.28
0.25
0.26
0.27
0.20

3.57
4.00
3.85
3.75
5.00

Polyurethane
      Expanded
      Expanded board
      Expanded, aged

1
1
1

0.14
0.16
0.20

7.00
6.25
6.30

Redwood

1

0.57

1.75

Redcork

1

0.33

3.05

Red wool batt

1

0.27

3.70

Routing, 1-ply membrane

0.048

2.00

0.50

Rubber, expanded, board

1

0.22

4.55

Sawdust

1

0.41

2.44

Sawdust/shavings

1

0.45

2.20

Sheep’s wool

1

0.34

2.96

Slate shingle

1/2

20.00

2.20

Softwood

1

0.80

1.25

Slone

1

12.50

0.08

Structural insulation board

1/2

0.76

1.32

Stucco

1

5.00

0.20

Terrazzo

1

12.50

0.08

Tile, hollow

4

1.00

1.00

Urea-formaldehyde

1

0.24

4.20

Urethane, foamed in place

1

0.16

6.30

Vapor-seal,2-layers of Mopped 15-lb felt

8.35

0.12

Vapor-seal, plastic film

minimal

Vegetable fiber board
   Sheathing
      Regular density
      Regular density
      Intermediate density
      Nail-base
   Shingle backer
   
   Sound deadening board
   Tile lay-in panels
                                  
                                  
   
Laminated paperboard
    Homo.board from repuped paper

1/2
25/32
1/2
1/2
3/8
5/16
112

1/2
3/4

0.40



0.50
0.50

0.76
0.49
0.82
0.88
1.06
1.28
0.74

0.80
0.53

1.32
2.06
1.2
1.14
0.94
0.78
1.35
2.50
1.25
1.89

2.00
2.00

Vermiculite

1

0.47

2.13

Vermiculite, loose fill

1

0.45

2.20

Wall, Vertical exterior, 15 mph wind

5.88

0.17

Wall, Vertical interior, still wind

1.47

0.68

Wood
    Bevel lap sliding
    Bevel lap sliding
    Drop siding
    Drop siding
    Fiber, soft wood
    Fiberboard
    Fiberboard, acoustical tile
    Fiberboard acoustical tile
    Shingles
    Shingles siding
    Shingles with insulating backer board
    Shingle, double
    Sub floor
    Vertical tongue & groove

1/2
3/4
3/4
1
1
1
1/2
3/4




3/4
3/4

1.27
0.30
.0.59

1.23
0.95
1.27



0.80
0.53
1.06
1.15
0.71
0.84
1.06
1.00

0.81
1.05
0.79
0.79
3.33
1.69
1.25
1.89
0.94
0.87
1.40
1.19
0.94
1.00