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shao 发表于 2014-4-4 19:53 
H) I* x% q, R8 L7 }外墙应该没有几十尺吧 / O0 i2 ^4 k9 m7 m! V5 m8 y) p# v! e$ F t
yes. say you have unit 33x30 FT for (990SqFt). # H7 z% u( W9 X: Y# [( L' k: {- ^
outside wall areas$ |6 U, X+ n7 ^" V( E0 j
33+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.
& \% f: s8 p9 V4 f( ainterior wall area (Party wall and corridor wall) ! H3 q6 p' k9 J1 k- E! r+ `( B
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.
2 O0 ?6 ]. n! }& z. c' \. a& nadd both together, 50SqFt to over 70SqFt
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7 r& m, @+ V, N/ hfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
- N9 W! U& N0 G* g" W0 C1 D* }& Byour 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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