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shao 发表于 2014-4-4 19:53 
, ?+ M( K" a/ o; [: L外墙应该没有几十尺吧 . f6 l. i6 F0 ?; e& E, e N
yes. say you have unit 33x30 FT for (990SqFt). 7 W, E/ |( i Z8 R9 m
outside wall areas
# @8 x. t! v1 t# M# p33+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.
0 M# u* E; R$ O) D+ _8 Ginterior wall area (Party wall and corridor wall)
5 I$ ^% E7 v# ]5 @, M& K, o0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.2 P1 x2 F7 C2 z
add both together, 50SqFt to over 70SqFt: @& D5 y+ |8 P/ D/ a
; U1 w5 C+ l" d' {for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)1 q2 I1 H* ^1 R' l2 X3 A* k
your 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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