Document 98odpoGkadq7nNzyX3VdDMz5
American Society of Heating and Ventilating Engineers Guide, 1929
Table 8-D. Coefficients of Transmission (U) of Various Types of Frame Wall Construction
Note.--These coefficients are expressed in B.t.u. per hour per square foot'per 1 deg. fahr. difference in temperature between the air on the two sides and are based on an outside wind exposure of 15 miles per hour.
beicic Ve^eee.
The val'*eo 0/ 0 in thia Tabic arc bai.cd on the /bllowihq Internal Conductivity s (C) which are
CApre-^ed. in fo.t.u. per Ur. per Sq.Ft. Pcr- IT
Brick
5.00 per r
Cement Mortar
6.00 per r
Planter (Gypoiioi) Wood, lath $ Pla^tei
2 3Z per f 2.00 as a pplied
Planter board. Cork board fiber Inflation (board form) felt or Quilt Insulation ("Soft) Cellular Gypsum 0*)
3.04 0-30 0.33
O.Z7 0.59
per r per 1`
per l" per r per r
flaked Gypsum, Dr^y (26*)
052 per r
Walls
Typical Construction
Sheatlnnq-^
4* Brick-
>3
t.TP' / <5heathmtj
144 Wood 1
145 Wood *
14b Wood 1
147 Wood 148 Wood *
Insulation between 5taddinq
Done
Yi felt or Qu.iffc $ Insulation Yi fiber Insulation % (Board form)
Cellular Gypsum fill
flosWedCypsum fill
Plaster base
Wood. Lath Wood Lath Wood Lath
Wood Lath Wood Lath
Co^^icient Transm/ ission
0.216 0.125 0.131
o.ioa
0.099
149 Wood
l Kfz Cork board
0.107
150 Wood
I50A Wood *
Yl fiber insulation 154 (board /brm)
15Z
f fiber Insulation (board form)
% fiber Insulation 153 Cboard form)
154 % Plaster board
Oone
Z* Cork board
klone
Uou
Yz fiber Insulation $
(board form) klone
Ji fiber Insulation ( board form)
Yi fiber Insulation (Board form)
Yz fiber Insulation (board form)
Yz fiber Insulation (board /brm)
3/s Raster board
0.091 0.17C 0.152 0.173 0.1040.262
Based on *36 in., the actual thickness of 1 in. or % in. sheathing.
Thickness of fill assumed 3% in., based on 2 in. by 4 in. studding,
fBuilding paper neglected in computations in accordance with accepted practice. iCan also be applied to inside of studding with plaster base separated by furring strips
Note.---The coeffioent used for plasterboard is 3.04 per inch thickness--recent data indicate values
as low as 1.30 for this material.
Note.--Plasterboard sheathing.is now made in half inch thickness.
'.
Note.--The coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb.
may be used.
Chapter I--Heat Losses from Buildings
Table 9 A and B. Coefficients of Transmission (U) of Various Types of
Interior Walls and Partitions ,f__These coefficients are expressed in B.t.u. per hour per square foot per I deg. fahr. difference in temperature between the air on the two sides and are based on still air.(no wind) conditions on both sides.
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pLA'STE&ED TE6.UE PaHHTIOUS
On one side I On both slides The values of O in this Table arc of Studdmq | of Studdmq based on the /Allowing Internal'
Insulation between
Studdmq
Conductivities CC) which are "cpres^ed m b.t.u. per Ur. per
sqj.fRt.aspeter r I(STypsum) 2.52 per l"
Planter board
5.04 per {'
Vfood lath 4 Plaster 2.00 as appl'd.
Fiber lns.(&oaraly6rql 0.33 per (*
Felt or Quilt !i*Ck/t) 027 perl*
Corkboard
0-30 per I*
Cellular Cypu (16*) 0.54 per 1* f\akedGypsum, Dry(24*) 0.52. per f
Gypsum Till between
Studdmq
Planter ba^e.
155 Metal Lath Wood Lath * Vs flatter board* ft'Fiber insulation (Board^>rm/
t" fiber Insulation (boarifarnfi
0.551
0.54b 0.311 0-211
O.X15 ~^5\
0-173 0.155 0.10b
0.\56
0.U3
1 0.143 1 0.136 -0.119 0.108
0-IOb 0.080
Ixh. Cork board*
0.149
0.074
I \<o\ V Cortboard*
O.U9
O.ObO
PLASTEE.ED UASOljg-V PAdTlTIOUS
The valuer cf (J in this Table are based on
the /ollowinq Internal Conductivities (C) which are
.expressed, in B-t.u. per Ur. per Sq.ft, per l*f
Uollow Clay Tilt (4*) ferict
0.65 per 4-' 5.00 per f
Uollow Gypsum Tile (4`) 1.00 . per l'
Wall Wall Construction Uo.
lt>2 4' Uollow Clay Tile
1E>3 4' brick
U>4 I
4*
Uollow Gypsum Tile _
_
The thickness of the Gypsum Fill is approximately 3f4 in-, as this is the approximate 4 in. dimension
of 2 in. by 4 in. studding. fMetal lath and plaster assumed % in. thick. N^Poitae.s--teTr hasesucmoeefdficHient usthedickfo. r plasterboard is 3.04 per inch thickness--recent data'.i.nd.icate values as lNowotea.s--1T.3h0efocroethffiisciemnatteursieadl. for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb.
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