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shao 发表于 2014-4-4 19:53 3 X, Y( m, z& R( n, g( _
外墙应该没有几十尺吧 3 `& ]' ?3 P; U
yes. say you have unit 33x30 FT for (990SqFt).
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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.
& _4 @4 R" N ?+ x& |interior wall area (Party wall and corridor wall)
/ y; U k6 d6 H0.33FT (4" wall) x 63FT = 21SqFt or 0.5 FT x 63 FT=31.5 SqFt.: Z$ t0 c, y d: u* v) `
add both together, 50SqFt to over 70SqFt
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* z2 j' A- t5 D3 |+ w! R0 D" l3 Zfor single house, say 1800SqFt (main floor 24x26=624SqFt + second floor 24x50=1200SqFt) W& s( V( A6 O! [. W' v
your exterior wall area will be 0.5x(24+26)x2=50 SqFt for main floor. 0.5x(24+50)x2=74SqFt for second. , N; V3 Y2 l( ]% D
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