Document kaEmo1EwGEqRe29v8YEjkQD0n

174 CHAPTER 9 1952 Guide Table 2. Conductivities (k) and Conductances (C) op Building And' . Insulating Materials--Continued These constant* are expressed in Btu per (hour) (square foot) (Fahrenheit degree* temperature difference.) Conductisitiee (k) are per inch'thickness and conductaruxs(0 are for thickness or - . construction stated, not per inch thickness. ' 'r ` * ` Matebial Description 1? "o Conduct- o o Q B H< IVITT OB Conduct ance Resistance 0. n 2 Per -Inch Thick- e H (k) ( Thick ness ness listed sO ia <a G) G):Q 2 < WOODS--(continued) Soft maple, 0 % moisture.. Sugar pine. 0 % moisture.. West coast hemlock, 0 % 42.0 28.0 34.3 75 75 - 80 0.95 0.04 0.90 Yellow pine................. Sawdust, various....... .......... Shavings, various from 31.2 12.0 80 * 90 ' 0.78 1.00 0.41 Shavings/from maple beechand birch (coarse)............ 13.2 90 0.30 *1.05 : ___-- 1.50 1.04 _L ' -- !41 (4) 0) _ -- 1.28 1.00 - 2.44 __ -- (1 (3) 0) -- 2.78 ' -- . (i) INSULATING : MATEftjAT.R ............................ Blanket and Bat Chemically treated wood fiben held between layers Flax fibers between strong Chemically treated hog hair 3.02 4.00 between kraft paper . .. 5.70 Chemically treated hog hair between kraft paper and asbestos paper..................... 7.70 Hair felt between layers of 11.00 . Kapok between burlap or 1.00 Stitched and creped expending fibrous blanket... 1.50 Paper and asbestos ' fiber with emulsified asphalt Cotton insulating bat.......... 0.875 6.25 4.50 8hort Staple Linters, 2.45 1.60 0.85 - 0.05 Felted cattle hair.................... 13.00 11.00 Felted hair and asbestos----- 7.80 Ground paper between two layers, each | in. thick made up of two layers of kraft paper (sample i in. 12.1 4.5 ' Made from sugar cane fiber.. 13.5 Made from hard wood fibers. 15.20 Made from wood fiber........... 15.90 Made from wood fiber........... 15.00 Made from wood fiber -- Made from wood fiber...... 15.20 Made from wood fiber........ 10.90 Made from licorice root. .. . 10.1 } in. insulating boards with out special finistr (eleven 16.5 to 2i:8 13.2 70 0.25 90 0.28 71 0.20 71 0.28 75 0.25 90 0.24 70 . 0.27 94 0.28 72 0.24 90 0.25 90 0.24 90 0.24 90 0.20 90 0.29 90 0.30 90 0.26 90 0.26 90 0.28 75 0.27 __ _ 70 0.33 70 0.32 72 0.33 70 0.33 52 0.33 -- 0.33 90 0.34 81 0.34 90 0.33 to _-- 0.40 0.34 _ 4.00 _ 3.57 3.85 _ 3.57 4.00 4.17 3.70 3.57 -- 4.17 __ 4.00 -- 4.17 -- 4.17 __ -- 3.85 3.45 -- 3.33 -- 3.84 -- 3.84 -- 3.57 0.40 __ _ -- -- -- -- -- -- -- 3.70 _ 3.03 3.12 3.03 3.03 3.03 3.03 2.94 2.94 -- 3.03 to -- 2.50 --. - . 2.94 __ -- __ __ -- -- __ -- --. -- -- --' 2.50 _ _ -- -- -- -- -- -- -- -- -- (8) 0) (S) 0) (3) (1) (3) (Is1)) fi! (* !'! mI* fi <) (!) O' (4; (3) 2 (3) (3) (6) 2! fi (3) (i) (4) See footnotes on first page of Table 2. Heat Transmission Coefficients of Building Materials 175 Table 2. Conductivities (fc) and Conductances (C) op Building and . Insulating Materials--Concluded These constants are expressed in Btu per (hour) (square foot) (Fahrenheit degree temperature difference.) Conductisitiee (k) are per inch thickness and conductances (O are for thickness or construction stated, not per inch thickness. ' Material Description ? &. 'D o - 05 A. 3 h I N Q `ou Q M Conduct^ IVTTY OB , Conduct- . ' ANCB 3 Resistance w -fib Per For 3 -H z Inch Thick- (i) (C) Thick- nees- ness . Listed. G)3 G) s A uthority INSULATING MATERIALS--(Continued) Loose FillTtpe.............. Made from ceiba fibers......... Made from ceiba fibers......... Chemically treated wood . fibers...................................... Fibrous material made from dolomite and silica............. Fibrous tnater^nl made from lag.............................. .......... 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 alnniinn........ ....... Expanded vermiculite........... Regranulated cork about A in. particles.. ___ ___ Hand applied granular mineral wool 2 in: to 6 in. " thick,' horizontal1 posi tion6. No covering.. ___ 4 in. machine blown granu lar mineral wool, horizon tal position6. No cover- ing.:.:........................ : . . ... Rock wool.......................... 1.90 1.60 4.0 1.50 9.40 3.00 5.00 1.50 4.20 7.0 8.10 6.05 to 7.13 150..704 75 75 75 75 103 90 75 75 72 70 90 -- -- 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 90 Corkboard............................. 8.7 Corkboard, asphaltic binder. 14.5 90 Chemically treated hoc hnir with film of asphalt. 10.0. 75 Sugar cane fiber insulation blocks encased in asphalt membrane.......................... .13.8., 70 Made from shredded wood and cements___;................. 24.2 72. Made from shredded wood and cement....................... 29.8 UeilUlftr ,, 9.0 _ 75 Cellular glass............;............. 9.0 50 See footnotes bn first page of Table 2. 0.23 0.24 0.28 0.27 0.27 0.31 0.20 0.27 -- -- -- __ -- 0.24 0.48 0.31 0.30 to' 0.33 -- _ 0.30 --- 0.27 -- 0.34 0.30 0.270.25 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 8.57. 3.33 2.17 i .so 2.38 2.50 -- -- -- _. __ -- (3) (4) (3) (1) (1) (3) (3) '__ --' __ __ (3) 0) (1) (4) __ -- > (h4s) _ (1) __ l(1l)) .__ I!) . __ 0) (3) _ (3) - __ (3) (4) . -- ' (l1ii) >ng. 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 is indicated by the following values. 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 percent moisture, 8.9 at 5 percent moisture, 11.2 at 10 percent moisture. Five soils of a fine texture at a 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-