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shao 发表于 2014-4-4 19:53 
6 `0 O3 j: i2 J, H( N6 h% @4 l% `外墙应该没有几十尺吧 ' D- B' A7 L( ~) z( ~- w( h. U
yes. say you have unit 33x30 FT for (990SqFt). ! U! H# c, r8 v$ R
outside wall areas
9 n8 f! X1 \" h5 X33+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.
: f9 V& b( Q# o4 [. \# Cinterior wall area (Party wall and corridor wall)
- T7 d- U+ j: K# d) I8 [0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
; G5 e _: x5 O; E, b5 gadd both together, 50SqFt to over 70SqFt2 f; _, [* Z4 { S
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)9 }' A8 G! b7 f
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. . @/ d" q5 F: P$ H
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