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shao 发表于 2014-4-4 19:53 
* b3 J+ v0 }" n' S3 j/ r- m外墙应该没有几十尺吧 _) y/ u$ |' w0 s( O( q
yes. say you have unit 33x30 FT for (990SqFt). ; B+ f! q- F) ?) M' N, Y
outside wall areas
/ W3 Z, a, F* Y; t33+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.
) J& b4 S" R1 _interior wall area (Party wall and corridor wall) 7 H4 x9 s8 i* T0 w6 U" T4 ?
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.! ~3 n/ i2 l1 e9 g* j& t
add both together, 50SqFt to over 70SqFt
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! p6 g8 d6 U- nfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
e1 A9 S0 P+ p4 G5 ]7 jyour 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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