Document 6RdEJo6xRwd34E292BLd15oNR

HEATINC VENTILATING AIR CONDITIONING GUIDE 1944 Table 2. Conductivities (ft) and Conductances (C) of Building and Insulating Materials--Continued These constants are expressed in Btu per hour per square fool Per degree Fahrenheit temperature difference Conductivities (k) are per inch thickness and conductances (C) are for thickness or construction stated, not per inch thickness. Material WOODS--(Continued) Description Densiti (Lb peb Sq Ft) MeaI* TEMP (Deo Fahb Conducttvitt OR Conductance (4) (O Resistance (*)-(*) 0 1 < Hard maple, 0 per cent moisture*........... Maple, across grain...................... Red cypress, 0 per cent moisture*..... ...... Short leafyellow pine, 0 per cent moisture* Soft elm. 0 Der cent mniature* Soft maple. 0 Der cent mnistnre* Sugar pine, 0 per cent moisture*............... West coast hemlock, 0 per cent moisture* Yellow pine...................................... Sawdust, various..............-............. Shavines, various from nlaner Shavings, from maple beech and birch (coarse)-...........................!........... 46.0 44.3 40.0 32.0 32.0 48.0 36.0 34.0 42.0 28.0 34.3 30.0 31.2 12.0 8.8 13.2 75 86 75 75 75 75 75 75 75 75 86 75 86 90 . 90 90 1.05 1.10 1.20 0.74 0.79 1.18 0.91 0.88 0.95 0.64 0.96 0.79 0.78 1.00 0.41 0.41 0.36 ::: 0.95 0.91 033 1.35 1.27 035 1.10 1.14 1.05 136 1.04 137 1.28 1.00 2.44 2.44 2,78 (4) ) (3) (4) (4) (45 (4) 4) (4) (4) (1) (4) 1) (3) (1) (I) (1) INSULATING MATERIALS Blanket and Bat Chemically treated wood fibers held Insulations......................... between layers of strone nanrav Eel grass between strong paper................. Eel grass between strong paper................. Flax fibers between strong paper............... Chemically treated bog hair between kraft paper--............................... Chemically treated hog hair between kraft paper and asbestos paper-- ___ Hair felt between layers of paperKaook between hnrlan nr nAncr Stitched and crepcd expanding fibrous .. blanket....................................... . Paper and asbestos fiber with emulsified asphalt bioder............ Cotton insulating bat........................... Felted cattle hair.......-.................... Felted cattle hair......................... .. Felted hair and asbestos................ - Ground paper between two layers, each H in. thick made up of two layers of kraft paper (sample x/i in. thick)........... 3 in. mineral wool bats, barrier lapped on warm side; horizontal positioo*.......- 3 in. mineral wool bats, barrier laid on warm side: horizontal position*....-........ 3 in. mineral wool bats, barrier laid on warm side; vertical position*...... 4 in. mineral wool bats, bamer lapped on warm side; horizontal position*. 4 in. mineral woo] bats, harrier lapped on warm side; vertical jwmtion*___ 4 in. mineral wool bats, no barriers; horizontal position*.--................. 3.62 4.60 3.40 4.99 70 90 90 90 0.25 0.26 0.25 0.28 5.76 71 0.26 7.70 11.00 LOO 71 75 90 0.28 0.25 0.24 1.50 70 0.27 4.2 94 0.28 0.875 ~ 72-- --0.24 13.00 90 0.26 11.00 90 0.26 7.80 90 0.28 12.1 3.67 2.24 2.24 3.0 3.0 1.77 0.30 0.26 0.25 0.31 0.33 0.30 , 0.40 4.00 335 3.70 2.50 333 0) Cl) Cl) (3) (I) (4) (4) (4) (4) (4) Reflective..--........................ See Table 1. Section C............ InsulaTiNn Board See notes on Page 94. Made from sugar cane fiber........... Made from corn stalks-- Made from exploded wood fibers Made from hard wood fibers Made from wood fiber.--.__ Made from wood fiber..................... 13.5 15.00 17.90 15.20 15.90 15.00. / 70 71 78 1 70 72 70 033 033 032. 032 033 033 3.03 3.03 (3) CHAPTER 4. HEAT TRANSMISSION COEFFICIENTS Table 2. Conductivities (fe) and Conductances (C) of Building and Insulating Materials--Concluded These constants are expressed in Btu per hour per square foot per degree Fahrenheit temperature difference. fb\ nr*. o*t inch thickness and conductances (C) are for thickness or construction stated. Material Description Conductivttt Density (Lb peb Sq Ft) Mean TEMP (Deg Fahb) OB Conductance ( (O Resistance (i)G) E as u < INSULATING MATERIALS --Continued Insulating Board --Continued . Made from wood fiber.................................. Made from wood fiber.................................. Made from wood fibei Made from wood fiber.................................. Made from licorice root............................H in. insulating boards withbut special finish/ (eleven samples)-- 1 in. insulating board0.. 8.50 15.20 16.90 16.1 16.5 213 13.2 52 72 90 81 90 033 039 033 034 034 033 to 0.40 034 --_ -- 3.03 3.45 3.03 2.94 2.94 3.03 to 230 2.94 ( C3) (3) u; (3) a) (4) Loose Fill Type. Made from ceiba fibers................................ Made from ceiba 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--*.......... ...........:......... Expanded vermiculite, particle sue-- Regranulated cork about % in. particles 1 Hand applied granular mineral wool 2 in. to 6 in. thick; horizontal position*, i No covering..................................... ...........1 4 in. machine blown granular mineral' wool, horizontal position*. No covering Rock wool............................................... ........ L90 1.60 130 9.40 3.00 5.00 130 4.20 63 18.10 6.05 7.13 5.74 10.0 75 75 75 103 90 75 75 72 90 90 0.23 034 037 037 031 036 -- 0.27 034 0.48 032 031 0t3o0 . 033 '_ 0.30 037 435 4.17 (3) (3) 3.70 3.70 332 334 (3) U) ... Cl) (3) 3.70 (3) 4.17 2.08 (3) CD 3.12 332 333 to 3.03 k (3) S(4i)! 333 3.70 (4) (1) Slab Insulations.___ Corkboard, no added binder-...........-........ Corkboard, no added binder.......................I Corkboard, no added binder........................I Corkboard, no added binder- Corkboard*........................... Corkboard, asphaltic binder--- --------------Chemically treated hog hair with film of asphalt.............................--................... Sugar cane fiber insulation blocks en cased in asphalt membrane.......... -....... Made from S5 per cent magnesia and 15 per cent asbestos--.............................. Made from shredded wood and cement.... Made from shredded wood and cement*-- 14.0 10.6 7.0 5.4 8.7 143 10.0 133 193' 243 293 90 90 90 90 90 75 70 86 72 034 030 037 035 039 032 0.28 030 031 0.46 0.77 _ 2.94 3.33 3.70 4.00 3.45 3.12 337 333 1.96 2.17 _ 130 (1) CD (1) Cl> (4) (1) (3) (3) (1) (3) (4) ' See notes on Page 94. spaces, the position (vertical, horizontal or inclined) of the material in the structure must be taken into consideration. For example, the resistance to heat flow upward is about one-third that of downward flow in a hori zontal-position in the same construction, as will be apparent from Table 1, Section C. However, the difference between upward heat flow through single horizontal or sloping air spaces and through single vertical air spaces is comparatively small for the same temperature difference. Con sequently the same conductance value (0.46) may be used for computing