Document 6aRR4JgbYQDvG9v9pg2nqx59
American Society of Heating and Ventilating Engineers Guide, 1929
Table 10-A. Coefficients of Transmission (U) of Various Types of
Floors and Ceilings
Note.--These coefficients are expressed in K.t.u. per hour per square foot per, Ideir,(ahr. difference in temperature between the air on the two sides and are based on still air (no wind) cortflffijffjQon both sides.
CousiaucTiqiJ...
The values cf D m this Tabic"are based, on the
j Topical Construction
/bllowmq Internal Conductivities /C) which ore
expressed m B.t.a. per Hr. per Sq.ft, per l*f
Wood (Yellaw Pine or fir)
LOO per 1*
Planter (Cyp^um)
.32 per f
Wood lath 4 Plotter Plaster board
2.00 3.04
Cork board,
0.50
Fiber insulation/froard/fcrm) a 33
Felt or Quilt Insulation (Soft) 0.17
Cellular Gypsum 0&*)
Q.59
f|VtedQypsum,Ory(Z6*) 0.51
ll/lMfi / Ua dfs %
> A.
os applied per l* per f per f
per l*
per l* per l*
_ -
Ceilinq
<T
C
U
. -e Oo 26
a_ 2
Type of Cevlmq
165 Uo Ceilinq
Insulation between Joists
. Uone
1rype
Flooring
Uo floormq
a
I'Yelitw Pme" l'Yellow Pint1 % Maple or Oat
floormq
Floormq on ft Floormq on
on Joists Fiber Insulate: (yellow Pme
(board form) Sub Floormq
on Joists :on Joists
b Cd
. a440
0.264
0.339
166
Metal Lath. f Plaster ())
Vlone
0.551
G245
0.174
0.110
167
Wood Lath . < Plaster (ft)
Uone
asoz
0-234
0.173
0202-
168
$6 Plaster board 4 Plaster (yzm)
Uone
0.54b
O.Z44
0.178
0.209
163
ft Fiber Insulation (board Arm) ( Plaster^
Uone
0.310
0.181
0.143
0.162
170
Wood lath, 4 Piaster Oft )
ft' felt or Qddt * Insulation (SqX)
0.187
0,131
0.110
0.121
Wood Lath 171 4 Plaster (ft*)
172
Wood Loth | Planter (Vi)
ft fiber fnsdation (board /broi) Cellular Cvpsum* fill
0.200 0.123
a 137 0.112
0.114 . 0.126
0.046
0.103
173
Wood Lath 4 Plaster Qft)
_Haked<2yp9uai 0.112
0.103
0.089
0.096
174.
V/l Cork board 4 Plaster (ftT)
Uone
0.149
0.111
0.095
0.103
1 *7 r 1 2* Cork board 1 j f Plaster (Vz)
Uone
0.119
0.094
0.082
0.088
1
*The value of V is the same if insulation Is applied to underside of joists and lath and plaster ceiling, separated by furring strips.
fBased on actual thickness of approximately % in. for 1 in. yellow pine flooring.
tThicknesa of fill assumed in., based on 2 in. by 4 in. joists.
as lNowotea.s--1T.3h0efocor ethffiisciemnatteusrieadl. for plasterboard is 3.04 per inch thickness--recent data indicate values
mayNobtee.u--seTdh. e coefficient used for cellular gypsum, 0.59 is for 18 lb. wei ght--weights as low as 12 lb.
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Chapter I--Heat Losses from Buildings
Table 10-B. Coefficients of Transmission (U) of Various Types of Floors and Ceilings
CoUCEETE COhl^TEUCTIOhl
The valuer of, U \n this Table are feared on the. fo\lowing Internal Conductivities(C) Which are expressed.-'in >.t.u. per Ur. per Sq.ft, per J*F
Tile or Terrajjo
10.00
Concrete (dtone 1:2:4 mix) 8.30
Cement Mortar
8.00
Wood (.Yellow Pine or fir)
1.00
Planter board
3.04
Planter (Gypsum)
2.32
Cork, board-
0.30
Tiber Insulation(jboard/bm) 0.33
Wood ( Maple)
\.XQ-
-p--e-r-'*V
P*r , per l per l per V per 1` per per l' per V
Ty pica \ Con st ruction - flooring
CetUnq
Type qf
Type of Floonriq
.i0V. Ceilinq. 63 . -2. wo0 uL
X'
%
> Uo Floormq _>clVxur*J> (Concrete bare)
I- a
`Yellow Pine T floormq on Wood. Sleepers embedded, in Concrete
b
ilb Maple or Oak. T Terraco loonno on ' i' or TUe 'ellow nne Sub- Floonnq loormq on Wood on Concrete peepers embedded a Concrete
Cd
176" --- i----r-' i
177
178
179
180 \ft Plaster applied
181 182
directly to underside cf Concrete
4* 6* ft' 10' 4' 6' ft' 10'
0. 508 0.452 0.408 0. 372 0.457
0.4M 0.374 0.*344
0.564 0. 334 0. 310 0. 288 0.337
0. 311 0.290 0.271
O.Z92 0.273 0.256 0.24 1 0.275
0.2 58 0.243 .0. 2 30
0.483 0.433 0.3920. 358 0.437 0. 395 0. 361 0.332
. 184 Suspended or /urred. 185 Uetal Lath ( Plotter 186 Ceilinq
4* 6* . ft'
187 10-
188 Suspended or /urred
184 Ceilinq
Plaster-
190 board. 4 Plaster
4* 6* ft*
191 10'
142 Suspended or/urred
4'
193 Ceilinq of- % Fiber
6*
\44 195
Insulation (Board/bnn) 6*
4 ft Plaster
'to*
196 Vi" Plaster on
147 198
IftT Cork board Set,in XK Cement Mortar an Concrete
(99
' 4* 6*
ft*
icr
200 Plaster on
4*
201 Z' Cork board "set m
202
Cement Mortar on Concrete
203
(y ft*
to'
0.264 0.248 0.234
0.222 0.263 1
0.247 0.234
0.221 0.193 0.184 0.176 0.169
0.138 0.133 . Q1Z9
o. 125 O.IIZ
0.109 0.106
0.104
0:219
0. 191
0.238
0.208
0.183
0.242 -
0.198
0.17 5
a 229
0.189
0.168
0.217
0.218
0. 190
0.256
0. 207
0.182
0.241
0.198
a. 174
0.228
0.189 ' 0.167
. 0.216
0.167
0.151
0.189
0.161
0.(45.
0.181
0.155
0.140
0.173*
0.149
0.136
, 0.166
0.124
0.115 '
0.136
O. 121
0. \\z
0.13Z
O.U7
0.109
0,118
0.114
0.106
. 0.124
0.103
0.097.
O.IU
0.101
0.094
0.108
0.098
0.092
0.105
0.096
0.090 '
0.103 .
The figures in column "a" are sufficiently accurate for concrete floors covered with carpet or linoleum. fThe figures in column "b" are sufficiently accurate for 96 *n- maple or oak flooring applied directly oNvoeter.t--heTchoenccoreetfeficoinenwtouosdedslefoepreprsla. sterboard is 3.04 per inoh thickness--recent data indicate values s low as 1.30 for this material.
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