Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings indicated in this chapter




НазваниеUnless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings indicated in this chapter
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TABLE 1106.7

SIZING SCUPPERS FOR A 5” PER HOUR RATE OF RAINFALL





HORIZONTALLY PROJECTED ROOF AREA (SQUARE FEET)

HEAD IN INCHES


LENGTH OF WEIR IN INCHES

4

6

8

12

16

20

24

1

230

346

461

692

923

1153

1384

2

641

961

1282

1923

2564

3205

3846

3

1153

1730

2307

3461

4615

5769

6923

4

1794

2692

3589

5384

7179

8974

10769


Note: to adjust this table for other than a 5” design rainfall rate multiply the square footage on the table by 5 then divide by the local design rainfall rate.


Example: For 4” of design rainfall rate a 4” long scupper with a 1” head would accommodate 287 square feet. 230 x 5 ¸ 4 = 287


SECTION R4413.7

SECONDARY (EMERGENCY) ROOF DRAINS


R4413.7.1 Secondary drainage required. Secondary (emergency) roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason.


R4413.7.2 Separate systems required. Secondary roof drain systems shall have piping the end point of discharge separate from the primary system. Discharge shall be above grade, in a location which would normally be observed by the building occupants or maintenance personnel.


R4413.7.3 Sizing of secondary drains. Secondary (emergency) roof drain systems shall be sized in accordance with R4413.6 based on the rainfall rate for which the primary system is sized in Tables R4416.6.2, R4413.6.3 and R4413.6.6. Scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section R4413.1.7. Scuppers shall not have an opening dimension of less than 4 inches (102 mm). The flow through the primary system shall not be considered when sizing the secondary roof drain system



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