Document QX2boxZZj5XQD3JZQmzg5ew1L

178. CHAPTER 9 1951 Guide Table 2. Conductivities (&) and Conductances (C) op Building and Insulating Materials--Continued These constants are expressed in Btu per (hour) (square foot) (Fahrenheit degree temperature difference). Conductivities (k) are per inch thickness and conductances (C) are for. thickness or construction stated, not per inch thickness. iHeat .Transmission" Coefficients of Building Materials 179 Table 2:;r.CoNDUCTiviTiEs (fc) and Conductances (C) op Building and Insulating Materials--Continued ,-n.tanJa ore eeprused in Btu per (Jour) (stum foot) (Fahrenheit Awr temperature, difference.) I sets cons (i) ere per tnch thickness and conductances (O are for thickness or construction stated, not per inch thickness. D ensity (Lb pbb Cu Ft) | A uthority Matehxai* Desckxptioh "oB Q M a < 'ft H ft 3. Conduct ivity OB Conduct ance Resistance Per For Inch Thick Thick ness <*) 7) ness .Listed (0 G) plastering RIALS . MATE Gypsum plaster, f in. thick. Cement piaster...................... Wood, lath and plaster, to* tal J |Q................ Gypsum plaster and ex* panded vermicuhte, 4 to 1 mix................................................ Insulating plaster 0.9 in. thick applied to ft in. gyp* sum board........................... __ -- - 39.9 54.0 73 -- 70 75 75 __ 8.80 8.00 -- - 2.50 __ 0.1S - 0.85 - 1.18 - 1.07 -- 0.11 0.40 (4) 8) (4) - (8) 0.S3 (3) ROOFING WOODS Asbestos shingles.................. Asphalt, composition or prepared.............................. Asphalt shingles................... Built-up roofing, bitumen or felt, gravel or slag surfaced9............................ Slate....... ................................ Wood shingles........................ 65.0 70.0 70.0 -__ -- 75 75 75 _ __ -~ Balsa.. Balsa.. California redwood, 0 % moisture*............................ Cypress................................... Douglas fir, 0 % moisture*.. Eastern hemlock, 0 % moisture*........................... Long leaf yellow pine, 0 % moisture*........................... Mahogany............................. Hard maple, 0 % moisture*. Maple...................................... Maple, across grain.......... Norway pine, 0 % moisture*. Red cypress, 0 % moisture0. Red oak, 0 % moisture*.. Short leaf yellow pine, 0 % moisturer.......................... . Soft elm, 0 % moisture*.. Soft maple, 0 % moisture0. . Sugar pine, 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)............ 20.0 fl.ft 7.3 28.0 28.7 34.0 30.0 40.0 34.3 46.0 44.3 40.0 33 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 90 90 90 75 86 75 . 75 75 '86 75 86 75 - 75/ 75. 75 75 75 75 75 86 -75 86 90 90 90 - __ -- 1.33 10.00 -- 0.58 0.38 0.33 0.70 0.67 0.67 0.76 0.86 0.90 1.05 1.10 1:20 0.74 0.79 1.18 0:91 0.88 0.95 0.64 0.66 0.79 0.78 1.00 0.41 0,41 0.86 6-0 6.5 6.5 __ -- 1.28 __ -- -- _ -- -- - __ -- -- -- -- -- --- " -- -- -- -- -- -- -- -- -- - - - 0.17 (3) __ 0.15 (3) -- 0.15 8) 0.75 0.10 -- 1.72 2.63 3.03 __ -- 0.78 __ -- -- (3) 5?) in 1.43 (4) 1.49 -- (1) 1.49 -- (4) 1.32 - (4) 1.16 --, 1.11- - -- 0.65 -- .. 0.91 . 0.83 -- 1.35 --- 1.27 -- 0.85 (4) (1\ (4) ^(s)) (4) (4) (4) 1.10 1.14 1.05 1.56 1.04 __ . ---- -- -- (4) (4) (4) (4) 0) 1.27 _ (4) 1.28 -- ai 1.00 -- (3) 2.44 . -- 0) 2.44 . - (1) 2.78; - (l) INSULATING MATE- RIALS .......................... Blasset and Bat Insulations.................... Chemically treated wood fi bers held between layers of strong paper................... Eel grass between strong paper.......................:........ Eel grass between strong paper................................... Flax fibers between -strong paper.................................. Chemically treated hog hair between kraft paper........ . 3.62 70 0.25 4.00 4.60 90- 0.26 - 3.85 3.40 90:. 0.25 - 4.00 4.90 90 0.28 - 3.67 5.76 nr 0.26, ,;-7 8.85; - (3) (1) (1) (1) (3) See footnotes on first page of Table 2.