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shao 发表于 2014-4-4 19:53 
5 S! n+ I$ v- Z9 a' D; r% P& J/ I外墙应该没有几十尺吧 $ e4 L. E2 L, s$ I; u7 _
yes. say you have unit 33x30 FT for (990SqFt).
4 o( z; ~3 s3 g3 Noutside wall areas
, M# ?/ q) Q' L5 d( W33+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.( M& p7 r7 c1 R/ u6 d
interior wall area (Party wall and corridor wall) % K' F6 f8 V5 m* U' h
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
+ q! _/ Y; B" V; H' Ladd both together, 50SqFt to over 70SqFt+ n. b, [/ _! ?2 f, W, H7 {, r
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt); e) o8 F8 ]/ [: L% c: C- s
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. / A5 R" c7 O+ M; t% V6 i( u) U
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