13
Insulation
Insul. K Factor
6”
8”
10”
12”
Air
4.65
6.94
6.65
6.50
6.40
Vermiculite
.47
2.73
2.67
2.64
2.62
Sawdust
.45
2.70
2.65
2.62
2.60
Cork
.38
2.62
2.57
2.55
2.53
Rock Wool
.30
2.52
2.49
2.47
2.45
Mac. Paper
.28
2.50
2.46
2.45
2.43
Styrofoam
.24
2.45
2.42
2.40
2.40
Polyurethane
.16
2.36
2.33
2.33
2.32
Type of
East
South
West
Flat
Surface
Wall
Wall
Wall
Roof
Dark Colored Surfaces,
Such as:
Slate Roofing
8
5
8
20
Tar Roofing
Black Paints
Light Colored Surface,
Such as:
White Stone
4
2
4
9
Light Colored Cement
White Paint
Medium Colored Surface,
Such as:
Unpainted Wood
Brick
6
4
6
15
Red Tile
Dark Cement
Red, Gray or Green Paint
1
4
5.10 204 230 255 281 306 332 357 383 408 434 459 485 510 536 561 587
612
2
8
3.40 136 153 170 187 204 221 238 255 272 289 306 323 340 357 374 391
408
4
3
2
12.6 1.80
72
81
90
99
108 117 126 135 144 153 162 171 180 189 198 207
216
5
4
2
16.4 1.44
58
65
72
79
87
94 101 108 115 122 130 137 144 151 159 166
173
6
5
3
19.6 1.20
48
54
60
66
72
78
84
90
96
102 108 114 120 126 132 138
144
8
6
4
3
25
0.90
36
41
45
50
54
59
63
68
72
77
81
86
90
95
99 104
108
10
8
4
33
0.72
29
32
36
40
43
47
50
54
58
61
65
68
72
76
79
83
86
10
6
38.7 0.60
24
27
30
33
36
39
42
45
48
51
54
57
60
63
66
69
72
6
50
0.48
19
22
24
26
29
31
34
36
38
41
43
46
48
51
53
55
58
Single window glass
. 9
27 1080 1215 1350 1490 1620 1760 1890 2030 2160 2290 2440 2560 2700 2840 2970 3100 3240
Double Window Glass
2.2
11
440 495 550 610 660 715 770 825 880 936 990 1050 1100 1160 1210 1270 1320
Triple Window Glass
3.4
7
280 315 350 390 420 454 490 525 560 595 630 665 700 740 770 810
840
6” Concrete Floor
4.8
5
200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575
600
Insulation (Inches)
Heat Load (BTU Per 24 Hours Per One Square Foot of Outside Surface)
Cork
Glass
Urethane
or
Fiber or
Urethane
(Foamed Temperature Reduction in ºF.
Mineral
Poly-
(Sprayed)
in
R (Outside Air Temperature Minus Room Temperature)
Wool
Styrene
Place)
k = .30
k = .26
k = .16
k = .12
1
40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Appendix - Tables
Note: Above insulation “K” Factors [Thermal Conductivity, BTU
per (hour) (square foot) (ºF. per inch of thickness)] and heat
gain factors for Cork and Window Glasses are extracted and
Insulation Values
“K” Factor - Insulating Value of any material is rated by its thermal conductivity
“U” Factor
- Overall coefficient of heat transfer, BTU per hour/per square foot/per degree F.
“R” Factor
- Thermal resistances
“X” = Inches of Insulation
K = UX = X/R
U = K/X = 1/R
R = 1/U = X/K
Table 2
Effective K Factor in Block Thickness of Insulation
Note: If blocks have 3 holes, add .75 to all of the values shown. The
above data is being shown for reference purpose only - this is a very
inefficient method of construction/insulation due to:
1. Concrete webs are dominant factor in calculating insulating effect.
2. Filling techniques may leave blocks improperly filled.
3. No vapor seal present - moisture infiltration decreases insulation
effect.
4. If used for freezers, moisture will freeze inside block and break
out the surface of the block.
5. Blocks are highly subject to setting cracks- more infiltration.
Table 3
Allowance for Sun Effect
(Fahrenheit degrees to be added to the normal temperature difference for heat leakage
calculations to compensate for sun effect- not to be used for air conditioning design.)
reprinted by permission from ASHRAE 1972 HANDBOOK OF
FUNDAMENTALS.
Table 1
Wall Heat Loads
