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shao 发表于 2014-4-4 19:53 
) \* I8 {% p( l j4 B. b% g0 Z外墙应该没有几十尺吧
) r4 y; s( V1 {/ o( y) Yyes. say you have unit 33x30 FT for (990SqFt). r9 E1 d$ u: O$ m; L, T8 H- K
outside wall areas
1 ]' O' _2 l/ O4 M4 w33+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.: Z+ _1 J2 S6 o8 V6 x& o
interior wall area (Party wall and corridor wall)
. z- |! M7 Z f$ [0 _4 b0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.6 g2 n8 h& V: \& C6 }' N+ A( n
add both together, 50SqFt to over 70SqFt/ p& B9 R- f$ b% U, L' L
$ [, h9 X, G' ofor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)% b+ z: O" g* C0 [" Z
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. - ?2 O+ [) m, B1 u# x
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