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shao 发表于 2014-4-4 19:53 
& J7 S" A; E$ k; ]( h& N d外墙应该没有几十尺吧 : @. p! b/ g; `6 o8 ^8 s* i
yes. say you have unit 33x30 FT for (990SqFt).
) x, ]7 S4 f; m1 ]# E# f& c! L j, Voutside wall areas
# u, c' W8 `" X33+30 FT outside wall could be anywhere 0.5FT (6" exterior wall width)x63 FT=31.5SqFt or 0.67 FT (sometimes lower floor has 8" exterior wall) x 63FT= 42.21SqFt.
% L6 w% b5 T2 p7 @interior wall area (Party wall and corridor wall) - q* M) Z3 h; A, G8 H1 Z* u; i
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
+ i5 h( [; y/ Zadd both together, 50SqFt to over 70SqFt
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, \, ~7 M. C6 n* n, _! W" m% Z% ffor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
. r3 m0 G1 g# r$ n+ Pyour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. $ r# s) |0 P9 h% d' N5 l) i
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