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shao 发表于 2014-4-4 19:53 
2 Q7 ^# ~7 h: @" P. b外墙应该没有几十尺吧
% g' Y+ \6 T3 \: Y, `' v9 Pyes. say you have unit 33x30 FT for (990SqFt).
1 I r* d+ w9 `outside wall areas
6 a/ l2 w+ r/ y% Q$ r% o, X4 K# v ~6 `; g33+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 E9 }' K" _3 _$ F
interior wall area (Party wall and corridor wall)
4 E; ^9 V1 G6 N3 q8 }0 R- |0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
; e: h) O' R! G# ]4 Vadd both together, 50SqFt to over 70SqFt
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& a0 K2 y) B }3 g+ k6 a3 R) Hfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
" r, \4 k" L. p8 T8 byour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second.
" n9 Q7 U- i: \3 u& i, x: C4 p9 V1 s8 N' l
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