The minimum size of any building drain serving a water closet shall be 3 inches.
Horizontal roof drain pipe sizing.
To convert to an area for use in table 1108 2 do this.
A 5 inch diameter pipe with a 1 4 inch per foot slope will carry 4 720 sq ft.
Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.
The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.
Zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax.
50 000 4 400 11 36.
Roof drain connected to an 8 in.
Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes.
The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525 2006 code of practice for drainage of roofs.
The result is the number of drains needed.
Horizontal drain 5 000 sq ft.
For larger roof drains the pipe may be smaller such as a 10 in.
Roof drain connected to a 6 in.
Adequate drainage is an important component of a properly installed roof so installing the correct size of drains is essential.
In total square footage covered per drain 23 14 2 880 1 920 1 440 1 150 960 720 575 480 410 360.
A minimum 5 inch diameter drain on a 1 4 inch per foot slope is required.
For example a 4 in.
For example in the u k.
The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using table 710 1 2.
5 000 4 x 3 75 4 688 sq ft.
Or 12 drains required.
This means that because our horizontal pipe from step 3 was 8 our vertical pipe will be also 8.
Following this logic it is possible that for roof drains 6 in.
1 inch 25 4 mm 1 inch per foot 83 3 mm m.
Or less in diameter the piping will be larger in diameter than the roof drain.
Take the roof s total square footage and divide by the total square footage handled by one drain.
