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shao 发表于 2014-4-4 19:53 ; b: O. O- y3 P- I, e2 u
外墙应该没有几十尺吧 7 c* `# f' o3 G2 M7 O* W9 a
yes. say you have unit 33x30 FT for (990SqFt). ) z5 P s% t# ]. h2 u9 j$ y
outside wall areas( V( b2 f+ G- C4 z
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.2 t: J. B9 ~* m4 B5 i( o
interior wall area (Party wall and corridor wall) + E3 l& y5 N' D. r3 H/ y
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt./ _$ m9 X0 m! V1 n( G7 J, z' s
add both together, 50SqFt to over 70SqFt* _/ ^" T% c# l! y R8 _
3 A. N+ u+ ?+ D: l4 _5 }' nfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)2 n4 h, a, l5 `
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. * Z5 k: @0 j* R5 z; x( f
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