A clerestory is also a side window but one that is placed high in the wall. It is usually contained in a part of the building that rises clear of the roof. Generally, it doesn't provide views towards the exterior but permits a deeper penetration of daylight into the room than a standard side window (Figure 6.5) while giving little glare discomfort to the occupants of the room. Like a standard side window, a south-facing clerestory will produce higher daylight illumination than one that faces north. East- and west-facing clerestories present the same problems as east and west windows: difficult shading and potentially high heat gains; however, sunlight penetration in the case of clerestories may not be as problematic as with standard side windows because the aperture is outside the field of view. The depth of the daylight zone depends on the
Figure 6.3 Balanced daylight penetration from two opposite side windows.
Figure 6.4 Daylight penetration from two adjacent side windows allows for more balanced daylight distribution and less glare.
mounting height of the clerestory (distance from the floor to the bottom of the aperture) and the width and length of the clerestory itself. The higher the mounting height, the deeper the daylight zone.
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