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shao 发表于 2014-4-4 19:53 
7 @) f. U6 U" e& @, M外墙应该没有几十尺吧 # p7 F' Y* w% m7 o
yes. say you have unit 33x30 FT for (990SqFt). # ?5 ?2 o2 r' E
outside wall areas
) f+ C) C2 {- H" M$ Q5 @' p33+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 T0 t, H) |1 }, B
interior wall area (Party wall and corridor wall) " Y. L+ K4 k. j d; e$ a, w: ^- O( M
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
* I6 b/ E) J5 a" O4 L8 }1 Oadd both together, 50SqFt to over 70SqFt: {, K6 o# X, |. j9 \) ~
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
O8 \1 D; W5 ]- cyour exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. * i! N) ?9 `% o. W" x2 e# A- Q2 g
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