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shao 发表于 2014-4-4 19:53 
2 I' e% q0 D2 [" c外墙应该没有几十尺吧
! J. B' W$ N# ayes. say you have unit 33x30 FT for (990SqFt).
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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.. [$ _! {0 @' U: ? F
interior wall area (Party wall and corridor wall)
* z& e* e+ |) Y0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.+ m! K6 _1 n1 ~6 V& ~' ]: f
add both together, 50SqFt to over 70SqFt7 Y4 u9 b+ b8 k c, o( b
; x1 k- }, w; tfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)1 A. e. q% r V3 l
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. 5 J' c, J( k3 v7 y
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