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American Society of Heating and Ventilating Engineers Guide, 1929
Table 10-C. Coefficients of Transmission (U) of Various Types of Floors and Ceilings
Note.--These coefficients are expressed In B.t.u. per hour per square foot per 1 deg. fahr. difference in temperature between the ground and the air over the floor and are based on still air (no wind) conditions.
COUCHETE C0U5TIZ.UCT10N) Ok) CClOUkJD *
The values of U in this Table are based, on the
followmq Internal Conductivities^?) which are
expressed, in &.t.u. per !Ur. per Sq. Ft. per I* f
Tile or Terraco
10.00 per l"
Concrete (^tone hi mu) 8.50 per 1*
Cinder Concrete
5.20 per l*
Wood. (Yellow Pine)
1.00 per 1*
Wood (Uaple)
1.20 per l'
fiber lnsulabon(Etanl/bni\) 0.53 per f
Cork, board
0.30 per 1"
Typical Construction
Ylhic.kness of Insulation m Inches where specified Insulation between Z membrane vttterproq^nq Courses^
Type of
Type of flooring
Insulation
t>
G
(^between Cinder 4 5tone Concrete )
>-
B S zz
ioEfn'
w -UU
8
f Yellow Pine 'Xs Maple or Oak 1" Terraco Viofloonnq F.loorinq on' Floormq on 1" or Tile (Concrete bare) Wood. Sleepers Yellow fine Sub- . Floormq on <n/ embedded in Floormq on Wood Concrete E Concrete t Sleepers enbedded
in Concrete
.E
li^ J-- a b C d
Z04 Uo Insulation
0' 4'
0. 556
0:388
0.308
0.526
205
O' 5'
0.5ZI
0.370
0.287
0.485
206
0* b'
o.48o
0. 355
0.286
0.467.
Z07
O' 8'
0.438
0. 32 7
0.268
0.420
208 fiber Insulation' zoq (feoard. form)
I' 4' r 5'
0. 207 0.202
0. 178 0.174
0.158 0.156
0.2Q3'.0.188
210
i' 6'
0.187
0.17 1
0.153
0.183
211
.1' 8'
0.188
0.164
0.148
0.185 '
212 Cork board
2' 4'
0.(18
0.108
0.101
o.tn.
213
2' 5"
0.116
0.107 '
0.100
0.115 '
214 215
T b V 8'
0.115 0.112
0.105 0.103
0.088 0.086
0.U3
0. no
Assume ground temperature to be 50 deg. fahr. tMembrane water proofing neglected in calculations. {The figures in column "b" may be used with sufficient accuracy for maple or oak flooring oh wood sleepers embedded in concrete.
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