Document G5nme5e3vkrB2xG6j3Yoq6a0q

1.74 CHAPTER 9 '1953: Guid< Table 2. Conductivities (fc) and Conductances (C) of Building Insulating Materials--Continued AND - These constant* are expressed in Btu per {hour) (square foot) (Fahrenheit degrees temperature difference.) Conductivities (fc) are per inch thickness and conductances (C) are for thickness or construction stated, not per inch thickness. Material Description WOODS--(continued) insulating RIALS............ MATE- Blanket and Insulations. .. Soft maple, 0 % moisture.. Sugar pwe, 0 % moisture.. Virginia pine........................... West coast hemlock, 0 moisture. White pine. Yellow pine Sawdust, various Shavings, various from planer.................................. Shavings, from maple, beech and birch (coarse).............. Chemically treated wood fi bers held between layers of strong paper.................... Flax fibers between strong paper................................ Chemically treated hog hair between kraft paper.......... Chemically treated hog hair between kraft paper and asbestos -- f Paper........... ..................... Kapok between burlap r Reflective Insulating Board. Stitched and creped ex panding fibrous blanket. Paper and asbestos . with emulsified as binder................ 1.50 -1 0.875 Cotton fibers Short Staple Linters, Fireproofed... 6.25 4.50 2.45 1 1.60 0.85 Felted cattle hair... Felted cattle hair. Felted hair and asbestos;!! Ground paper between two 0.65 13.00 11.00 7.80 . layers, each } in. thick made up of two layers of Paper (sample | in. Mineral Wool....... 12.1 4.5 See Table 1, Section C. Made from sugar cane fiber.. Made from hard wood fibers. Made from wood fiber.......... Made from wood fiber........... Made from wood fiber........... 13.5 15.20 15.90 15.00 Made from wood fiber............! Made from wood fiber......... Made from licorice root........ i in. insulating boards with 15.20 16.90 16.1 out special finish * (eleven samples).................................. 16.5 to 1 in. insulating board............2113..28 See footnotes on first page of Table 2. 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 0.26 90 0.29 90 0.30 90 0.26 90 0.26 90 0.28 0.27 I 0.33 0.32 0.33 0.33 0.33 0.33 0.34 0.34 0.33 to 0.40 0.34 --- | 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 3.03 3.12 3.03 3.03 3.03 3.03 2.94 2.94 3.03 to 2.50 2.94 - (3) (4) 0) (4) A utho rity M ean T emp (F ah r D eg) 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 differences.) Conductivities (It) are per inch 'thickness and conductances (C) are for thickness or . construction staled, not per inch thickness. Material Description . ' e> O a n J >> S za Q Conduct ivity OB Conduct ance' Resistance Per For (1) Inch Thick Thick ness at ness lasted' G) (c) !s -c INSULATING MATERI ALS--(Continued) Loose Fill Type.................. Made from ceiba fibers......... 1.90 Made from ceiba fibers......... . 1.60 Chemically treated wood fibers...................................... 4.0 Fibrous material made from dolomite and silica............. 1.50 Fibrous material made from slag......................................... 9.40 Redwood bark........................ 3.00 Redwood bark........................ 5.00 Glass wool fibers 0.0003 in. to 0.006 in. in diameter___ 1.50 Granular insulation made from combined silicate of lime and alumina............... 4.20 Expanded vermiculite.......... 7.0 Regranulated cork about in..particles.......................... 8.10 Hand applied granular 6.05 mineral wool 2 in. to 6 in. thick, horizontal posi . to tion. No covering........ 7.13 4 in. machine blown granu lar mineral wool, horizon tal position. No cover ing........................................... 5.74 Rock wool................................ 10.0 75 75 75 75 103 90 75 75 72 70 90 90 Slab Insulations................. Corkboard, no added binder. Corkboard, no added binder. Corkboard, no added binder. Corkboard, no added binder. Corkboard.............................. Corkboard, asphaltic binder. Chemically treated hog hair with film of asphalt........... Sugar cane fiber insulation blocks encased in asphalt membrane ........................... Made from shredded wood and cement.......................... Made from shredded wood and cement........................ Cellular glass........................... Cellular glass........................... 14.0 10.6 7.0 5.4 8.7 14.5 10.0 13.8 24.2 29:8 9.0 9.0 90 90 90 90 -- 90 75 70 72 -- 75 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 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 0.30 0.27. 0.34 0.30 0.27 0.25 0.29 0.32 0.28 _ -- -- -- --- -- 3.33 3.70 2.94 3.33 3.70 4.00 3.45; 3.12 3.57 0.30. .0.,46 0.77 -- .0.42 -- 0.40 3.33 2.17 1.30 2.38 2.50 (3) (3) (4) (3) (1) - - 0) (3) (3) (3) ay (4) (4) U) _ (1) -- ov -- (1) -- (1) -- .(4): -- :(!) (3) -- (3) -- (3) -- (4) . -- (1) (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 was as 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 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-