#Daylight + lighting
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20(23)<br />
Obstruction Modification:<br />
As indicated previously, adjoining buildings<br />
obstruct the amount of possible daylight<br />
entering a building.<br />
This requires (yet another correcting), chart,<br />
to the determined room depth.<br />
So to follow our example from the previous<br />
slide; We now have a building creating an<br />
obscuring angle of say 20 o<br />
With a room depth of 'just over twice the<br />
window height'<br />
We can use this table to see that a<br />
correction factor of 0.77(approx) needs to<br />
be applied to our unobstructed room depth.<br />
In simple terms, when windows are<br />
obscured in built up areas, the effective<br />
depth of a room in this example is 77% less<br />
than for a building that is unobstructed.
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