Document 8OeEOwR3EXMg1ekEav4z3p29d
American Society of Heating and Ventilating Engineers Guide, 1931
Table . 28. Coefficients of Transmission (U) of Concrete Construction Floors on Ground a
Note.-r-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.
The values of U inthisTable are basedon thefollowinq
Internal Conductivities or Conductances which are
expressed in B.t.u. per Ur. per Sq.Ft. per \*f*
Tile or Terrajjfo
10.00 per l"
Concrete (Stone 1:2:4- mix)
8.SO per I"
Cinder Concrete
5".2.0 perl*
Wood (Yellow Pine}
1*00 per T
Wood (Maple) .
1.20 per I*
E.iqid Insulation (Boardform)
0.35 per I*
Cork, board
0.30 per l*
Typical Construction ^ Flooring
YThick.ness of Insulation in Inches where specified
3>*Cinder Concrete
Insulation between 2. biembrane ^ water proofinq Courses b
Type of
Type of Floorincj
3wV-
Insulation
C(Binetdweere4nStone
Concrete) ,
> .. _t0Vucsf/l*
x:
VJo Floormq P Yellow Pine
(Concrete bare] Floortnq on
CQc>:'
Wood Sleepers embedded, in Concrete c
o
-- Maple or Oak. T Terraco
floonnqon 1"
or Tile
Yellow Pine Sub- Floormq on
floonnq on Wood Concrete.
Sleepers embedded
in.Concrete
2
p
A.
B
c0
i Mo Insulation . 0* 4' 0.556
0.388
0.308
0.526
i]
o' 5' . .0.521
0.370
0.277
0.495
3
o' 6` 0.490
0.355
0.284,
0.44,7
4;
o' 8 0.439
0.327
0.24,8
0.420
5 Ciqid Insulation r 4"
(Boardform) -
(o' i' 5
0.207 : 0.202
0.178 0.174
0.159 0.154,
0.203 a 198
1: - r < o.m
0.171
0.153
0J93
-8-
f 8 0.188 - 0.164
0.148
0.185
9 Corkboard It 4' .0.118
0.108
0.101
0.117
10
2 .5* 0.U6
0.107 : 0.100
0.115 V
U.
t O' 0.U5
0.105
0.098
0.113
12
.2* 8* 0.U2
o.io3 : 0.094>
O.UO
^Assume ground temperature to be 50 deg. fahr. ' bftfembrarie waterproofing neglected in calculations. ' <JThe figures in column " B" may be-used with sufficient accuracy for maple or oak flooring on wood sleepers embedded in concrete.
64
T a b l e 2 9 . C o e f f ic ie n t s of r an sm issio n U ) of V a r io u s T ypes of F l a t R oofs C overed w it h B u il t -up RT (
(U nderside of R oof E xposed)
: jVote.-- T h e s e c o e f f ic ie n t s a r e e x p r e s s e d in B .t .u . p e r h o u r p e r s q u a r e f o o t p e r 1 d e g . f a h r . d if f e r e n c e in t e m p e r a t u r
IDES AND ARE BASED ON AN OUTSIDE W IND EXPOSURE OF 15 M ILES PER HOUR.
Chapter 3--Heat Losses by Transmission
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s
aPre cast cement tile. For heat-treated clay aggregate cement tile covered w ith roofing, U = 0.438 (1% in. slab) and U m 0.528 (1 in. slab), based on
conductivity of 1.62 per 1 in. bNominal thicknesses specified--actual
thicknesses
used
in
computations.
..
cNo built-up roofing. The value for corrugated iron is obtained by assuming th a t the surface area is increased 50 per cent.