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shao 发表于 2014-4-4 19:53 
# d9 O: d5 E3 U外墙应该没有几十尺吧
8 u* Q6 u4 ?2 z7 Jyes. say you have unit 33x30 FT for (990SqFt). % L" ]9 R, l: s& y; c5 z! C
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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.
' F" y' Q4 H* u0 u9 U! D. Zinterior wall area (Party wall and corridor wall)
, b0 E% k6 U4 o3 ^1 y0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.! M2 }' U. m. ~4 f7 X; L, h
add both together, 50SqFt to over 70SqFt
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)* D' `! Z$ P C; ?- `' {2 X# d
your 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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