Size and placement of rooftop equipment may necessitate additional roof drains.
Roof drain coverage area.
When placing roof drains it is good design practice to locate the drains no more than 50 feet from the roof perimeter nor more than 100feet apart.
Divide total roof area by area found in step 3 to obtain the number of drains required example.
Smith carefully designs and manufactures a full line of roof drains deck drains scupper drains promenade and parking area drains and more to satisfy both the artistic eye of the architect and the calculating mind of the engineer.
Or 12 drains required.
If the result is a fraction less use the next higher number.
Determine rate of rainfall for this example use 4.
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Total roof area 500 by 200 100 000 sq.
A good rule to follow is to provide two roof drains for a total roof area less than 10 000 square feet.
Divided by the 4 600 sq.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Below to obtain roof area that can be handled by each leader.
The above result is the number of roof drains required for the building.
It is important to remember that no roof area should ever have less than two roof drains.
Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.
The result is the number of drains needed.
It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches.
An additional roof drain should be added for each 10 000 square foot area.
Roof pitch affects the actual area of the roof.
Sizing schedule wa o r i d m t n v c a u t a z c o w y n m t x.
According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8.
Therefore the 100 000 sq.
Equals 32 6 or 33 drains required.
Divide the total roof area by the area that one leader will handle.
Area roof will require 100 000 3070 32 5 or 33 roof drains for ideal drainage.
Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.
The drains should be placed at a maximum of 75 feet in each direction away from each other.
And then determine from the chart below how many roof drains you require.
