Document wryQ7ZdNNOmGnJxDDMpK14wxd

1 I- Itj . j* ; ' i\: ! - I rM i !i : '$ i- ' 1 . f\. !i `id Table 2. Conductivities (A) and Conductances (C) op Building and Insulating Materials--Continued These constants are expressed in Bin per (four) {square foot) (Fahrenheit degrees temperature difference.) Conductivities (k) are per inch thickness and conductances (C) ore far thickness or construction stated, not per inch thickness. Material' Description Conduct ivity or ConductX ANCE ft ' ft Per For 4 s Inch Thick- Thick- ness H (*> (O ness Listed . Zft <a Qa G) G) 6 4* WOODS--(continued) Soft maple, 0 % moisture*. 42.0 Sugar pine, 0 % moisture*. 28.0 Virginia pine............ 34.3 West coast hemlock, 0 % moisture*............................... 30.0 White pine............................... 31.2 Yellow pine........................... Sawdust; various.................... 12.0 Shavings, various from planer.......................... . 8.8 Shavings, from maple, beech and birch (coarse). . 13.2 75' 0.95 75 0.64 86 0.96 75 0.79 86 0.78 __ 1.00 90 0.41 90 0.41 90 0.36 -- -- _ -- -- -- - -' 1.05 1.56 1.04 1.27 1.28 1.00 2.44 2.44 2.78 [4) (4) U) --' -- -- (3) -- (1) -- (O. (1) INSULATING MATE- RIALS............ Blanket and Bat Insulations.. - Chemically treated wood fi bers held between * of strong paper-- . 3.62 , 4.90 between kraft paper--. . . 5.76' 70 . 6.25 90 0.28 71 0.26 _ - 4.00 3.57 3.85 (3) -- (1) -- (3) asbestos paper. . . 7.70 71 0.28 - 3.57 - paper.. . 11.00 75 0.25 - 4.00 - . 1.00 90 0.24 - 4.17 - Stitched and creped panding fibrous blanket. . 1-50 Paper and asbestos cv~" with emulsified as] binder........... ............... t . Cotton insulating bat. f 4.2 0.875 6.25 Cotton fibers Short Staple Linters, ) Fireproofed....... \ 4.50 2.45 1.60 0.85 0.65 Felted cattle hair............... . ;13.00 Felted cattle hair....... .. 11.00 Felted hair and asbestos. .. 7.80 Ground paper between tv o layers, each 2 in. thi< k f . thick)............ Mineral Wool. . 12.1 ..j 4.5 70 0.27 94 . 0.28 72 0.24 90 0.25 90 0.24 90 0.24 90 0.26 90 0.29 90 0.30 90 0.26 90 0.26 90 0.28 75 __ 0.27 - 3.70 _ 3.57 -- 4.17 -- 4.00 -- 4.17 -- 4.17 -- 3.85 -- 3.45 -- 3.33 -- 3.84 -- 3.84 d. 0/ 0.40 -- -- ! 3.70 - -- -- -- -- -- -- -- --. -- -- 2.50 Reflective................... -,...| See Table 1. Section C. -1 - .Li. i - 1 - 1 ~ 1 - Insulating Board. 13.5 | 70 10.33 re. 15.2C 70 ; 0.32 Made from wood fiber... Made from wood fiber... ..,15.90 . jis.oo 72 ; 0.33 70 1 0.33 Made from wood fiber... j 52 0.33 Made from wood fiber... .. 15.20 0.33 Made from wood fiber .. .. 16.90 90 0.34 Made from licorice root ... 16.1 81 0.34 h- , n 1 ... 16.5 90 0.33 21.8 to __ 0.41 1 in. insulating board. ... 13.2 -- 0.34 -- -- -- -- -- -- _ -- 3.03 3.12 3.03 3.03 3.03 3.03 2.94 2.94 -- -- --. -- -- -- 3.03 to 2.50 2.94 1 1 - (3) (3) (1) (3) 811 ui aa) 8|w <i) 0) CD .... .(!) ;4 'ATr wK --f li)#i <3)fe (3) <s) (3) ' ?l 4r< Sec footnote;- on first page of Table 2. Heat. Transmission Coefficients of Building Materials 175 Table 2. Conductivities (A) and Conductances (C) of Building and Insulating Materials--Concluded These constants are expressed tn Btuper (four) (square foot) (Fahrenheit degree temperature differences.) Conductivities (k) are per inch thickness and conductances (C) are for thickness or construction stated, not per inch thickness. M e a n em p (F a h r D eo)T | A utho rity Material Description & D O ft ft ft 'J JHsaz * 0 Conduct ivity or Conduct ance Resistance Per For Inch Thick Thick ness < (C) ness Listed G) G) INSULATING MATERIALS--(Continued) Loose Fill Type.............. Made from ceiba fibers.......... Made from ceiba fibers.......... Chemically treated wood fibers................................... Fibrous material made from dolomite and silica...: Fibrous material made from . slag............................................ Redwood bark........................... Redwood bark.................... Glass wool fibers 0.0003 in. to 0.006 in. in diameter.... Granular insulation made from combined silicate of lime and alumina Expanded vermiculite....... Regranulated cork about in. particles............................ Hand applied granular mineral wool 2 in. to 6 in. thick, horizontal positionb. No covering............ 4 in. machine blown granu lar mineral wool, horizon tal position. ' No cover- Rock wool.................................. 1.90 75 1.60 75 4.0 75 1.50 75 9.40 103 3.00 90 5.00 75 1.50 75 4.20 72 7.0 . 70 8.10 90 6.05 to 7.13 - 5.74 -- 10.0 90 Slab Insulations............. Corkboard, no added binder. 14.0 90 Corkboard, no added binder. 10.6 90 Corkboard, no added binder. 7.0 90 Corkboard, no added binder. 5.4 Corkboard*........... .................. 8.7 90 -- Corkboard, asphaltic binder. 14.5 90. Chemically treated hog hair with film of asphalt............ 10.0 ' 75 Sugar cane fiber insulation blocks encased in asphalt membrane.............................. 13.8 70 Made from shredded wood and cement....................... 24.2 72 Made from shredded wood and cement........................ 29.8 -- Cellular glass............................. 9.0 75 Cellular glass............................. 9.0 50 0.23 0.24 0.28 0.27 0.27 0.31 0.26 0.27 _ -- -- -- -- -- -- 0.24 -- 0.48 . -- 0.31 -- 0.30 to 0.33 - 0.30 0.27 0.34 0.30 0.27 0.25 0.29 0-32 0.28 -- -- _ -- -- -- -- -- 0.30 0.46 0.77 0.42 0.40 -- -- -- -- -- 4.35 4.17 3.57 3.70 3.70 3.22 3-84 3.70 4.17 2.08 3.22 3.33 to 3.03 3.33 3.70 2.94 3.33 3.70 4.00 3.45 3.12 3.57 3.33 2.17 1.30 2.38 2.50 _ -- -- -- -- -- -- -- -- - -- -- _ -- -- -- -- -- -- . --. -- -- (3) (3) (4) (3) M) m (3) (3) (3) a) (1) (4) (4) (1) (1) (1) (11 (11 (41 (1) (3) (3) (3) (4) (D 1) See footnotes on first page of Table 2. ing. For increases of moisture content exceeding about 6 to 12 percent, the conduc tivity of frozen soil becomes progressively greater than that of the unfrozen soil. Effect of Density. Density affects the thermal conductivity of a soil in about the same manner for all soils, at any moisture content, and for either the frozen or un frozen condition. On the average, each one pound per cubic foot increase in dry density increases the thermal conductivity by about 3 percent. Effect of Moisture. An increase in moisture content, up to the point of saturation, causes an increase in thermal conductivity. The rate of increase in typical soils y.8 m follows: average conductivities, in Btu per (square foot) (hour) (Fahren heit degree per inch), of four sands at a density of 110 lb per cu ft were: 6.8 at 2.5 Pcreent moisture, 8.9 at 5 percent moisture, 11.2 at 10 percent moisture. Five soils at in De ^ex*'ure density of 100 lb per cu ft, gave average conductivities of 6.7 at 10 percent moisture, and 9.5 at 20 percent. Thus, the doubling of moisture con-