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shao 发表于 2014-4-4 19:53 
5 ~3 H/ s+ J6 B( x; N" b外墙应该没有几十尺吧 # ^9 A: z% R' N! @9 L, {' ^' t
yes. say you have unit 33x30 FT for (990SqFt). + v8 [! D3 p! W9 t) i
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33+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.
3 V$ y- V1 l* xinterior wall area (Party wall and corridor wall) 7 u# ~) `& N+ Y; ]( o, Y- w8 R
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.; o, [4 [4 A! Z
add both together, 50SqFt to over 70SqFt
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
( A7 I( T; h* P6 U7 G* X( eyour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second.
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