Document V34EdK7Jpym340DEd8Z8RQEq

172 CHAPTER 9 1956 Guide Table 2. Conductivities (), Conductances (C) and Resistances (R) op Building and Insulating Materials (Continued) , (Design Values)* Material. Description INSULATING MATERIALS Board and SLAB8 Cellular glass...................................... Corkboard (without added binder) Hog hair (with asphalt binder) PWlaoosdticsh(froeadmdeedd()c..e..m...e...n..t.e..d...i.n....p...r.e..f.o...r.m.. ed slabs) Loose Fill Macerated paper or pulp products... Redwood bark shredded.................... Mineral wool (glass, slag, or rock). Sawdust or shavings___ Vermiculite (expanded) .................. RINOSOUFLATION MASONRY MATERIALS Concretes All types , Preformed, for use above decK. Approx.. Approx.. Approx. Approx. Approx Approx. Cement mortar. /....................................................... Gypsum-fiber concrete 87V4% gypsum, 12V4% Lighwtwooedigchhtipsaggregates including expanded shale, clay or slate; expanded slags; cinders; pumice; perlite; vermiculite; also cellular concretes masonry UNITS Sand and gravel or stone aggregate (oven dried) Sand and gravel or stone aggregate (not dried). Stucco.............................. .......... Brick, common.... Brick, face............ Cl1aycetillled,eheopl.l.o..w...:............................................ 3 in. 1 cell deep.................................................... 4 in. 2 cells deep.........................................................6in. 2 cells deep.........................................................8in. 2 cells deep....................................................... 10in. 3 cells deep................................................ 12 in. Concrete blocks, three oval core: Sand & gravel aggregate........................... 4 in. ........................... 8 in. ........................... 12 in. Cinder aggregate......................................... 3 in. ............................. 4 in. Gypsum partition tile; 3 x 12 x 30 in. solid__ 3 x 12 x 30 in. 4-cell. 4 x 12 x 30 in. 3-cefl. Lightweight aggregate (expanded shale, clay, slate or slag; pumice). METALS PLASTERING MATERIALS Stone, lime or sand. (See Chapter 5. Table 1) Cement plaster, sand aggregate........................... Sand aggregate....... .................................... M in. Sand aggregate........................................... in. Gypsum plaster: Lightweight aggregate.'.................................... Viin. Lightweight aggregate..................................... $4in. Lightweight, agg. on metal lath..................... 94in. Heat Transmission Coefficients of Building Materials 173 Table 2. Conductivities (k), Conductances (C) and Resistances (/2) of Building and Insulating Materials (Concluded) (Design Values)* Conductivity or Resistance Conductance (R) Material Description PLASTERING MATERIALS Perlite aggregate --............................................... Sand aggregate............... . ........................ Sand aggregate............................................ Vi inSand aggregate-- ......... ..................... ?4 in. Sand aggregate on metal lath................. H in. Sand aggregate on wood lath............................. Vermiculate aggregate.............................................. ROOFING Asbestos-cement shingles Asphalt roll roofing........... Asphalt shingles............. Built-up roofing......... Slate...................................... Sheet metal.................. Wood -shingles................. 94 in. H in. SIDING materials (On Flat Sur face) Shingles Wood, 15-in. 7)4-in. exposure............................. Wood, double, 15-in., 12-in. exposure......... Wood, plus iosul. backer board.............in. Siding Asbestos-cement, V4 in., lapped . Asphalt Roll Siding.. Asphalt Insulating Siding (V4 in. bd.). Wood, Drop, 1 x 8 in................................ Wood, Bevel, V4 x 8 in., lapped............. Wood, Bevel, 94 x W in., lapped............ Wood, Plywood, 94 in., lapped............... Structural glass............................................. WOODS Maple, oak, and similar hardwoods. fir, pine, and similar softwoods......... Density (Lb, per Cu Ft) (*) 45 1.5 105 5.0 105 105 120 70 70 70 400+ ItP(O IfSSjH c tn c (0 G) 11.10 9.10 7.70 2.50 0.67 0.18 0.59 0.09 0.11 0.13 0.40 4.76 6.50 2.27 3.00 20.00 Negl 1.06 0.21 0.15 0.44 0.33 0.05 0.94 1.15 0.87 0.84 1.19 0.71 1.40 4.76 6.50 0.69 1.27 1.23 0.95 1.59 10.00 0.21 0.15 1.45 0.79 0.81 1.05 0.59 0.10 45 1.10 32 0.80 0.91 1.25 * Representative values for dry materials at 75 F mean temperature, selected by the A.S.H.A.E. Tech nical Advisory Committee on Insulation. They are intended as design (not specification) values for ma terials of building construction in normal use. For conductivity of a particular product, the u the value supplied by the manufacturer or secure the results of unbmspH euser may obtain _______.muuuus iiuiiiau, cosra. Includes paper backing and facing if any'. In cases wnere the insulation forms a boundary (highly re flective or otherwise) of an air space, refer to Table 1, Sections B and C, to obtain the insulating value of the air space for the appropriate effective emissivity and temperature conditions of the space. 1 Insulating values of acoustical tile vary depending on density of the board and on the type, si2e and depth of the perforations. An average conductivity it value is 0.42. The U. S. Deportment of Commerce, Simplified Practice Recommendation for Thermal Conductance Factors for Preformed Above-Deck Roof Insulation, No. R 257-55, recognizes the specification of roof insula tion on the basis of the <7 values shown. Roof insulation is made in thicknesses to meet these values. There fore.^ thickness supplied by different manufacturers may vary depending on the conductivity k value of the particular material. Not oven dried--conductivity k prior to drying, approximately 11 to 3 years. condition to the maximum density obtainable by heavy ramming, general findings of the investigation are-as follows: The Effect of Temperature. Soils were tested at several mean temperatures.. The degree of influence of temperature depends upon whether it is above or below freez- Jng. For increases of moisture content exceeding about 6 to 12 percent, the conductrvity 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,