Size horizontal storm drainage piping.
Roof drainage design guide.
In the design and detailing of a roof drainage system consideration must be given to a range of factors such as.
Roof load requirement 7.
Rainfall intensity roof catchment area gutter size capacity gutter fall gutter outlets sumps rain heads nozzles downpipe size quantity and placement overflow consideration material.
Structural design of the roof and roof load.
Type of roof construction 2.
The rain storm the flow of rainwater on the roof surface the ability of the roof drain to move the water from the roof to the piping the vertical piping the horizontal piping and the connection to the point of discharge.
Step by step instructions step 1.
Location of drains 5.
Slope of the roof.
Desired rate of drainage 6.
The sizing of the roof drainage system must consider all components.
Size vertical storm drainage piping.
Volume of expected rainfall.
Inspect the current roof drain s and the drain line through the building for leaks and assure that the materials are.
Developing the design criteria for a roof drainage plan that will perform with the roofing system to drain the roof is critical priorto the bid process and roof system installation.
Determine leader or pipe size.
Safety load requirement 8.
Secondary drainage shall be provided through the use of sidewall scuppers or internal roof drains.
First and foremost be sure to comply with all local plumbing codes.
When selecting a roof drain note.
Properly designed roof drain must have the following features.
Calculate total roof area.
The location and degree to which.
2 3 4 5 6.
Maximum pipe flow.
Pleasing dome shape with a low profile and adequate free drainage area corrosion resisting dome material effective debris protection overflow drainage to allow drainage during debris build up gravel stop positive flashing clamp seepage control channels.
Ipc provides four steps to size the roof drains on a building.
Calculate the total roof area by multiplying its length by width.
Secondary or emergency roof drainage is required wherever the buildup of water is detrimental to the roof structure.
2 3 4 5 6 and 8 in.
Select number of roof drains and calculate the roof area sloped to each drain.
Determine 100 year 1 hour rainfall rate used for location of building.
In either case the discharge shall be located so that it is readily visible by building occupants.
Design assistance services are offered as a courtesy to the roofing design professional and contractors to ensure the project s success.
Inspect the roof surface and roof drains on a regular schedule to find and clear away any debris clogging the drains.
To select the proper roof drain the following information must be known.
