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shao 发表于 2014-4-4 19:53 
0 f9 F3 S9 m, k; g, V外墙应该没有几十尺吧
/ r& s ?' c* i0 ^yes. say you have unit 33x30 FT for (990SqFt). " S1 r/ {# F; u, ^9 @( D0 a
outside wall areas
/ A' w. E/ K6 n( R2 y' `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.
& C. t2 ~1 _# z7 o! L: D4 c4 sinterior wall area (Party wall and corridor wall)
" X+ g2 E! }5 k# ]0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.. |, j8 l4 k0 _( b3 n$ ]
add both together, 50SqFt to over 70SqFt
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
" u, N, b Y8 m" z$ Jyour 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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