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Michigan Administrative Code (Last Updated: November 16, 2016) |
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Department LR. Licensing and Regulatory Affairs |
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Bureau of Construction Codes |
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Chapter Construction Code - Part 7. Plumbing Code |
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Part 7. PLUMBING CODE |
Section 408.30713. Vertical conductors and leaders.
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Rule 713. Section 1106.2 and table 1106.2(1) of the code is amended to read as follows:
1106.2 Vertical conductors and leaders shall be sized for the maximum projected roof area, in accordance with Table 1106.2.
TABLE 1106.2
SIZE OF VERTICAL CONDUCTORS AND LEADERS
DIAMETER OF
LEADER
(inches)a
HORIZONTALLY
(square feet)
PROJECTED
ROOF
AREA
Rainfall rate (inches per hour)
1
2
3
4
5
6
7
8
9
10
11
12
2
2,880
1,440
960
720
575
480
410
360
320
290
260
240
3
8,800
4,400
2,930
2,200
1,760
1,470
1,260
1,100
980
880
800
730
4
18,400
9,200
6,130
4,600
3,680
3,070
2,630
2,300
2,045
1,840
1,675
1,530
5
34,600
17,300
11,530
8,650
6,920
5,765
4,945
4,325
3,845
3,460
3,145
2,880
6
54,000
27,000
17,995
13,500
10,800
9,000
7,715
6,750
6,000
5,400
4,910
4,500
8
116,000
58,000
38,660
29,000
23,200
19,315
16,570
14,500
12,890
11,600
10,545
9,600
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m ².
a. Sizes indicated are the diameter of circular piping. This table is applicable to piping of other shapes provided the cross-sectional shape fully encloses a circle of the diameter indicated in this table.
History: 1982 AACS; 199-2000 AACS; 2001 AACS; 2010 AACS.