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shao 发表于 2014-4-4 19:53 . J" L6 [2 b5 {1 I$ @8 x- t! B
外墙应该没有几十尺吧 / m+ c9 L& E# N# Z% Z, L
yes. say you have unit 33x30 FT for (990SqFt). $ x" O& S7 e! l: H e- k$ I4 y7 K2 z3 d
outside wall areas
9 a* X/ G/ p( l# ~3 {, U9 K33+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.
" W, Q5 _. J6 }interior wall area (Party wall and corridor wall) 5 @7 v* |% K O; \
0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.# g$ V) v$ Z3 w T5 W' A
add both together, 50SqFt to over 70SqFt4 N; R# q& {, Y) S! A" X3 d0 s1 j5 a
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for single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt)
$ l; t2 X c n- ]. b2 ]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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