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shao 发表于 2014-4-4 19:53 
2 K: b, I5 G `" x' z) v. X外墙应该没有几十尺吧 1 Y" c+ ~' A; V4 O
yes. say you have unit 33x30 FT for (990SqFt). 8 l+ o& c6 @# @9 H) B
outside wall areas
+ Z# l, ], A' `/ L) X$ G. 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.6 a+ j4 \4 _. i+ D# Y& p6 C" t1 a9 }
interior wall area (Party wall and corridor wall) # C! b: G2 l/ w- v8 f
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
5 k# _9 J# Z, W. l8 J3 x' |add both together, 50SqFt to over 70SqFt3 G4 L; n% R+ f# O4 {
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
0 M& z; }0 V# Q$ j' I. L! Nyour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. 0 f5 U: t( }, Z: `0 w& I
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