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shao 发表于 2014-4-4 19:53 
9 b8 {! z7 k3 N外墙应该没有几十尺吧 6 x' V7 w- l. Y
yes. say you have unit 33x30 FT for (990SqFt).
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+ x4 j: c$ N9 j' W9 ]5 O8 L33+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.# T0 F2 o+ |+ Y$ a' u& [
interior wall area (Party wall and corridor wall) ( H, U; \/ H' q9 \) H1 L x: j
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.* t7 k* i9 O% Y# j" g
add both together, 50SqFt to over 70SqFt
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)" o, S" ]4 [- W! T
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. 2 o z2 h0 d8 g8 g3 \& S
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