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shao 发表于 2014-4-4 19:53 
$ o: S* V% w6 ~) B外墙应该没有几十尺吧
% Q& q- u, g" Iyes. say you have unit 33x30 FT for (990SqFt). 5 z6 [0 `& O& h: ^4 v, F! t
outside wall areas
2 d! a% [+ w' L$ {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/ s# p0 d. n+ `7 pinterior wall area (Party wall and corridor wall) & Y3 r, H ?: [7 w) _9 t7 y
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
1 W2 S; {, A" G+ l* ~* Y* k: Iadd both together, 50SqFt to over 70SqFt9 t8 r& |' ?. M, a% l7 Y' w/ U
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
* j* W( _$ w6 t9 Oyour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. 8 Z! S1 x+ c: ^- f
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