Document RJbk5Qm854Roe8Jdjv8dgEVmk

American Society of Heating and Ventilating Engineers Guide, 1931 Chapter 3--Heat Losses by Transmission, Table 32. Coefficients of Transmission with Unheated Attics Notr.--The FIGURES ON THESE PAGES ARE THE COMBINED COEFFICIENTS of TRANSMISSION PITCHED ROFS mooE CEILINGS, and are expressed in b.t.u. per hour per SQUARE FOOT OF ROOF AREA PER 1 DEG. FAHR. DIFFERENCE IN TEMPERATURE BETWEEN THE AIR UNDE^? tuwaTED ATTICS. AND TOfjT^MAGE WIND EXPOSURE OF 15 MILES HAS BEEN. ASSUMED. These COEFFICIENTS ARE BASED ON ONE-THIRD PITCHED ROOFS, BUT ARE SUFFICIENTLY ACCURATE ^^OUTS^XI>E AIR-p.--nr.Half PrTCH. The values of U in this Table are based or? tb following Internal Conduc- -t vities or Conductances which areexpressed in B.t.u.per Ur.perSq.Ft per IT \spbalt or Composition Goofmq fc.so as applied aslsabteestSohsmSahmleqstes VVv^ooooddL(aYthe4lloPwlaPsinteeror fir) 4.00 as applied . 10.37 per p \lM00 Derap1*plied F laster board CFf-aiqsidteIrns(Gulyaptsiounm)(feoarJdf_orm)% F Uxible Insulation 3.13 peri* 2.32 per fo.33 per f o.27 per l" C.ork. board C-ellular Gypsum (Id*) F laked Gypnum, Dry (IB*) 0 30 per l" o.S* per 1* O.Mperf fcaofinq b and Goof _D e Sheathing 3 2 No Attic Flooring Insulation between Ceiling Joists . Wood i Plaster i R.iqid 1' (tiqid Lath and board $ Insulatio 1 Insulation Plaster Plaster t Plaster 4 Plaster Ceilinq Ceilinq Ceilinq Ceiling A Bc0 i None 2 Wood f Flexible b 3 Wood. Strips* 2" Cellular 4 Gypsum .4 2" Flaked Gypsum 5 Asphalt fa Shingles or Composition 7 Goofinq on Wood 8 Sheathing None ^ Flexible b V Cellular Gypsum 2* Plaked Gypsum 4 4 None C.iqid Asbestos 10 Shmqles on 5 Flexible Wood II Sheathinq 2" Cellular <* Gypsum 12 r Flaked Gypsum 13 None Slate or Tile 14 and Cool inq flexible felt on Wood 15 Sheathing Z. Cellular Gypsum 16 V flaked Gypsum b d 0.263 0.264 0.140 0.141 0.141 0.141 0.116 0.04fa 0.12fa 0176 0.107 0.040 0.047 0.042 0.081 0.071 0.272 0.273 0.144 0.143 0.143 0.143 0,118 0047 0.128 0.128 0.108 0.04D 0.043 0.043 0.081 0071 0.71 \ 0.272 o.m 0.143 0.143 0.143 0.118 0.047 0.128 0.128 0.108 0.040 0.043 0.043 0.081 0.071 0.780. 0.781 0.148 0.145 0.145 0.145 0.120 0.048 0.130 0.130 0.104 0.040 0.043 0.043 0082 0072 Typical Construction (Looting - Goof Sheathing Unheeded Attic Atttc flooring Plaster Ceiling-" VW Yellow Pine Attic floor in q l\*Corkboard 4 Plaster Ceilinq 2* Corkboard i Plaster Ceiling Wood I Ptast|[t Gvqid l* Giqid (\ Cork- Lath and' board ^ \mulahsn| Insulation board 4 Plaster Plaster 4 Raster 4 Plaster] Plaster Ceding Ceitmq Ceding Ceding Ceding V Cork board 4 Plaster Ceding WI KL 0.106 0.088 0.172 0.078 0,068 0.104 0.074 0.064 0.101 0.172 0.104 0.101 0.136 0.104 0.087 0.074 0.044 0.080 04)68 0.060 0.088 0.076 0.064 0.057 0.04,1 0.054 0.078 0.078 0.070 0.062 0.053 0.044 0.107 0.088 0.175 0.175 0.138 0.110 0.087 0.075 a 074 0.068 o.uo 0.110 0.045 0.081 0.068 0.060 0.015 0064 .0.102 0.102 0.088 0.076 0.064 0.057 O.Ofct 0.054 0.078 0.078 0.070 0.062 6054 0.044 0.107 0.088 0.175 0.115 0.138 0.110 0.087 0.075 0.074 0.068 0.110 0.110 0.045 0.081 0.068 0.060 0.075 0.064 0102 0.102 0.088 0.016 0.064 0.057 O.Ofal . 0.054 0.078 0.018 0.070 0.062 0.054 0.044 0.108 0084 0.174 0.174 0.140 am 0.088 0.076 0.080 0.068 O.ltl O.lll 0.046 0081 0.068 0.060 0.076 0.065 0.103 0.103 0084 0.076 0.065 <2458 0061 0054 0.078 0.078 0.070 6.062 0.054 0.044 aBased on 1 In. by 4 In. spaced 2 in. aBased on 1 in. by 4 in. spaced 2 .in. * . bCan also be applied to underside of ceiling joists with furring strips between. insulation and c [ bCan also be applied to underside of ceiling joists with furring strips between insulation and celling. Ill oBased on actual thickness.of 1 in. lumber of approximately in. * cBased on actual thickness of 1 in* lumber of approximately -, jdThe coefficient used for cellular gypsum, 0.59 is for 18 Ib. weight-^weights as low as 12 lb. may k.fl dThe coefficient used for cellular gypsum. 0.S9 is for 18 lb. weight--weights as low as 12 lb. may be used. 68. 69 X