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shao 发表于 2014-4-4 19:53 
, L1 j# @( e. }/ ^& T6 `% H$ q外墙应该没有几十尺吧
" W+ U7 B4 E. Zyes. 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.: p, P n3 t3 E! U2 W5 W5 F `
interior wall area (Party wall and corridor wall)
7 g" h: p, \ c0 F& m0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt., [) k: s6 Q" R$ P& K
add both together, 50SqFt to over 70SqFt
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f& F" y. Q! w* n2 Nfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)0 [0 s7 j4 ?0 n, L& B7 H" q
your 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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