Size horizontal storm drainage piping.
Roof drainage design guide.
Safety load requirement 8.
When selecting a roof drain note.
Desired rate of drainage 6.
To select the proper roof drain the following information must be known.
Calculate total roof area.
Secondary drainage shall be provided through the use of sidewall scuppers or internal roof drains.
The sizing of the roof drainage system must consider all components.
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.
Select number of roof drains and calculate the roof area sloped to each drain.
Slope of the roof.
In the design and detailing of a roof drainage system consideration must be given to a range of factors such as.
Size vertical storm drainage piping.
Calculate the total roof area by multiplying its length by width.
Step by step instructions step 1.
Volume of expected rainfall.
Location of drains 5.
Rainfall intensity roof catchment area gutter size capacity gutter fall gutter outlets sumps rain heads nozzles downpipe size quantity and placement overflow consideration material.
Determine leader or pipe size.
2 3 4 5 6.
Inspect the current roof drain s and the drain line through the building for leaks and assure that the materials are.
Roofs inevitably serve as temporary rainwater reservoirs.
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.
In either case the discharge shall be located so that it is readily visible by building occupants.
Type of roof construction 2.
Maximum pipe flow.
Ipc provides four steps to size the roof drains on a building.
The location and degree to which.
Properly designed roof drain must have the following features.
Design assistance services are offered as a courtesy to the roofing design professional and contractors to ensure the project s success.
Structural design of the roof and roof load.
Inspect the roof surface and roof drains on a regular schedule to find and clear away any debris clogging the drains.
From there consider the following.
The greater the slope the less water build up and thus roof load.
Roof load requirement 7.
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.
Determine 100 year 1 hour rainfall rate used for location of building.
