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American Society of Heating and Ventilating Engineers Guide, 1928 Table 4. Internal Conductivities of Building Materials and Insulations1 Note.--The internal conductivities in this table are expressed in B.t.u. per hour, per square feet, per 1 deg. fahr., per 1 in. thickness unless otherwise stated A. Building Materials Material Description Density (Lb. per Cu. Ft.) Mean Temp, of Sample (Dec. Fahr.) Internal Conduc tivity (C or Cu) Authority*4 Asbestos . Sheet--................. Asbestos Board____ Corrugated_______ Asbestos Wood . . Asbestos and ce- mentcompressed. Asbestos Mill Bd... Pressed Asbestos__ Asbestos Shingles.. . _________ Asphalt Shingles___ ___ ___________ Brickwork.. ............ Mortar Bond and dry conditions. Brickwork_________ Damp or wet.____ Cement Mortar.___ ________ _______ _ Concrete.... ............... Stone 1-2-4 mix___ Concrete_______ ____ Stone........................ Concrete. . .. ___ Stone 1-2-5 mix___ Concrete-- Cinder 1-2-4 mix__ Concrete Blocks .... Stone Dry......... ..... Cornell Wood Board Ground Wood pulp (&' thick). Gyplap Gypsum between layers of heavy paper (H ' thick) Gypsum___________ Building--oven dried 3 weeks. Gypsum Partition Tile. with 15 per cent wood fiber. Hollow..................... 2 in. Hollow Clay Tile, H in. plaster 4- in. Hollow Clay Tile. in. plaster 6 in. Hollow Clay Tile. K in. plaster 2 in. Hollow Clay Tile.................... , 48.3 20.4 123.0 60.5 65.0 70.0 132.0 140.0 145.0 110.0 103.6 53.5 78.0 120.0 127.0 124.3 110 110 86 86 75 75 100 ___ ________ 110 75 95* 122 75 '68 75 90 0.29 0.48 2.70 0.843 6.00* 6.50* 4.00 5.00 8.00* 8.30 6.30 6.27 2.35 5.20 4.84 2.50* 2.60* 68 2.99 2.30 75 1.00 75 1.20 110 1.00* 100 0.60* 105 ................ -- 0.47* 1.14* Willard, Lichty & Harding Willard, Lichty & Harding Bureau of Standards Bureau of Standards Peebles. Armour Institute Peebles. Armour Institute Willard, Lichty & Harding Recommended by Harding & Willard > Willard. Lichty & Harding Willard, Lichty & Harding Peebles, Armour Institute C.L. Norton, Boston, Mass. C.L. Norton, Boston, Mass. Hencky Peebles, Armour Institute Bureau of Standards Poensgen Peebles, Armour Institute Willard, Lichty & Harding Willard, Lichty & Harding Calculated4 *See Chapter LX. by Chas. H. Herter of the Report of the Insulation Committee. AS.R.B.. Annual Meeting 1022. Revised to 1924, entitled "Heat Transmission of Insulating Materials" for a more com prehensive collection of heat transmission data relating to..building and insulating materials. *For thickness stated or used in construction, not per 1 in. thickness. 8 Hot side of plate. 4Estimated from values reported in University of Illinois Engineering Station. Bulletin No. 102, .for hollow clay tile plastered both sides, assuming the conductivity of cement plaster = 8.0 per 1 in. thickness. Calculated from 2 in. tile tests. Average of several values. *Cement mortar and stucco assumed same as cement plaster. Roofing, 0.15 in. thick (1.34 lb. per sq. ft.), covered with gravel (0.83 lb. per sq. ft.), combined thick ness assumed 0.25. Estimated from value of C = 2.99 for gypsum and c 1.0 for wood. *Not compressed. 11 The conductivity of plaster varies with the composition. Note range of values from 2.32 to 8.0. The average value for plaster is probably about 5.0. On account of the comparatively high conductivity of plaster and the fact that it is seldom applied more than $ in. thick, this material does not appreciably effect the overall transmission of a construction, excepting in the case of thin uninsulated walls. 13See "Mechanical Equipment of Buildings" by Harding and Willard, page 56. **Thickness of lime plaster and wood lath from back of lath to face of plaster, about % in. |4In addition to the conductivity values for the authorities listed, considerable work of importance pertaining to the heat transmission of various types of construction and materials has been done by the late Prof. John R. Allen and Prof. F. B. Rowley of the Engineering Experiment Station of the University of Minnesota, and Prof. A. J. Wood of the Engineering Experiment Station of Pennsylvania State College* 12 Chapter I--Calcinating the Heat Losses from Buildings Table 4. Internal Conductivities of Building Materials and Insulations1--Continued Material Description Density (Lb. per Cu. Ft.) Mean Temp, of Sample (Deg. Fahr.) Internal Conduc tivity (C OR Cu) Authority14 4 in. Hollow Clay 6 in. .Hollow Clay 8 in. Hollow Clay 12 in. Hollow Clay 16 in. Hollow Clay Magnesia (85 per cent) and Asbes tos (15 per cent). Plaster____ *.--........ Plaster Board........ - Roofing*----------------- Cement................ -- Built-up bitumen and felt, gravel or slag surfaced.TM Built-up bitumen and felt, gravel or slag surfaced__ 13.5 19.3 46.2 prepared..-...... .... Sawdust___________ 'Shavings.__________ Ordinary...... ........ Sheetrock___ ___ __ Gypsum mixed ""'60.7...... with sawdust be- . tween layers of heavy paper (0.39 in. thick). ....... ....Stone.__ -.__________ Limestone or Sandstone. plaster***. Woods: Cypress................. Across grain Across grain______ Maple Flooring.... Across grain______ Maple________ -- Mahogany...... ...... Across grain______ Virginia Pine____ Across grain______ White Pine______ Across grain._____ Yellow Pine--____ Across grain______ 28.7 33.4 40.0 44.3 34.3 42.0 34.3 31.2 0.65* Calculated4 0.50* Calculated4 0.432 Estimated 0.26* Estimated 0.185* Estimated 110 0.51 Willard. Lichty & Harding 86 0.508 Bureau of Standards 86 2.32i Bureau of Standards 8.00** Willard. Lichty & Harding 86 3.04 Bureau of Standards 1.3256 Willard, Lichty & Harding 5.30*- Willard. Lichty & Harding 75 6.50* Peebles, Armour Institute 86 1.04 Bureau of Standards 86 0.707 Bureau of Standards 90 3.60* Bureau of Standards 201 10.37 10.0 8.007 75 2.0* 86 75 86 86 75 . 86 86 0.668 1.000 1.20 1.103 0.900 1.30 0.958 0.784 1.000 Lees & Chorlton Estimated Willard, Lichty & Harding Peebles. Armour Institute Bureau of Standards Willard, Lichty & Harding Peebles, Armour Institute Bureau of Standards Bureau of Standards Peebles. Armour Institute Bureau of Standards Bureau of Standards Peebles. Armour Institute B. Insulations {Dry) Balsa wood-- ......... Across grain. __ 20.0 90 0.58 Bureau of Standards Balsa wood...... ......... Across grain-- ___ 8.8 90 0.38 Bureau of Standards Balsa wood--... ......... Across grain.. ..... 7.3 90 0.33 Bureau of Standards Balsam wool10 Chemically treat- 2.2 90 0.27 Bureau of Standards ed wood fiber. Cabots quilt10 ....... Eel grass between 4.6 90 0.26 Bureau of Standards Kraft paper. Cabots quilt10-- Eel grass between 3.4 90 0.25 Bureau of Standards Kraft paper. Celotex. -- . Board form insu- 13.5 70 - 0.33 Peebles. Armour Institute . lation made from sugar cane fiber. j Celotex........... Board form insu- 13.2 90 0.34 Bureau of Standards } lation made from sugar cane fiber. 1 Corkboard_______ Pure; no added 14.0 90 0.34 Bureau of Standards i ' binder. [* Corkboard.. . Pure; no added 10.6 90 0.30 Bureau of Standards h binder. 13