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shao 发表于 2014-4-4 19:53 
5 g+ f- N# [% e& x5 f7 h外墙应该没有几十尺吧 ) \0 O4 S5 q* a) n9 g
yes. say you have unit 33x30 FT for (990SqFt). ( ~7 A6 x" d8 }! V
outside wall areas
, v- v% t" P! a/ r( y; O33+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.
1 ~- {9 T+ f, {& Zinterior wall area (Party wall and corridor wall)
( Z4 X2 { P. h$ F0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
. h+ O# Y' s8 j( z4 O0 Iadd both together, 50SqFt to over 70SqFt# o! ~! u( K, l5 w6 r$ Y
9 Z8 x" I# Y0 B; l, x `/ gfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
3 t9 g9 v7 X2 Q7 V, byour 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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