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shao 发表于 2014-4-4 19:53 
, T, s. c( b: e; O外墙应该没有几十尺吧 9 ^& V \* v; W) b! U
yes. say you have unit 33x30 FT for (990SqFt). 6 g" L4 z: }( ^. q) ]
outside wall areas* U3 w. \( |5 Y& [' m. B
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.4 _. J) d+ X8 X, c
interior wall area (Party wall and corridor wall) 1 M& d6 L; a0 E, s0 l
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.* }3 i' |" _3 f6 ?) D
add both together, 50SqFt to over 70SqFt1 U1 j7 t( P- G
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
) Q& J6 }: p( Z, M% E+ D( 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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