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<br /> _ ..; R903.4 Roof drainage. Unless roofs ,0
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<br /> roof drains shall be installed at each
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<br /> \ low point of the roof 1
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<br /> 1 1 1 i ----- R903.4.1 Secondary (emergency I
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<br /> overflow) drains or scuppers. Where .
<br /> \ roof drains are required, secondary
<br /> i g . emergency overflow roof drains or
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<br /> scuppers shall be provided where the
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<br /> . roOf perimeter construction extends
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<br /> \ water will be entrapped if the primary
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<br /> Overflow drains having the same size „
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<br /> 3 1 ‘ as the roof drains shall be installed • I I
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<br /> with the inlet flow line located 2
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<br /> 1 inches(51 mm)above the low point of I
<br /> the roof, or overflow scuppers having
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<br /> three times the size of the roof drains
<br /> and having a minimum openhig height .
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<br /> ./ %---....., of 4 inches(102 mm)shall be installed 1
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<br /> in the adjacent parapet walls with the
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<br /> --.-i.-60-0,b L-00 iz, t inlet flow located 2 inches (51 mm)
<br /> above the low point of the roof served.
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<br /> ' . The installation and sizing of overflow
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<br /> i comply with Sectionsco1n1dgaonCrdsodh,
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