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shao 发表于 2014-4-4 19:53 
5 I% z! H! v# ^- I9 c/ ]$ C' s外墙应该没有几十尺吧
8 _0 Z2 b; i8 {/ `1 ryes. say you have unit 33x30 FT for (990SqFt).
0 L* I4 z9 ~4 W& e$ z+ s: W5 W: ]outside wall areas4 }. A1 G0 E) ?% Q! V; e& U/ U, _
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.
) l j: ?6 ^+ a3 @& I- Rinterior wall area (Party wall and corridor wall) 9 D1 q) O) d: h1 w
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt." y3 s @1 J7 u, o- |6 K! Z K
add both together, 50SqFt to over 70SqFt5 a# m, E- \ T( `* b1 O0 R- w
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
1 C. U/ Y7 N2 g( X- Xyour 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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