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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 Roong 8 5 8 20
Tar Roong
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 coecient 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
Eective 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
inecient method of construction/insulation due to:
1. Concrete webs are dominant factor in calculating insulating eect.
2. Filling techniques may leave blocks improperly lled.
3. No vapor seal present - moisture inltration decreases insulation
eect.
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 inltration.
Table 3
Allowance for Sun Eect
(Fahrenheit degrees to be added to the normal temperature dierence for heat leakage
calculations to compensate for sun eect- not to be used for air conditioning design.)
reprinted by permission from ASHRAE 1972 HANDBOOK OF
FUNDAMENTALS.
Table 1
Wall Heat Loads