There are conditions on a roof that is not practical to lower a drain as illustrated in the videos above.
Flat roof drain strainers.
The result is the number of drains needed.
The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.
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This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
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.
If that s the case then an alternative solution is to fabricate a large strainer that will fit around the drain.
Recommended for installation in flat areas with decks that are constructed of steel wood or concrete these roof drains are suitable for many installations.
If appropriately designed a strainer or leaf filter is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged preventing any water flow.
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Flat roof drain strainers.
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Calculate drains needed.
The above sizing data is offered as a guide only.
Roof drains provide effective internal drainage of water from the roof surface and are a practical year round solution to removing water from the roof surface in any weather or season.
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This video explains the principle of a drain basin.
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12 inch cast iron drain dome strainer.
Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged.
Take the roof s total square footage and divide by the total square footage handled by one drain.
The design and configuration of a strainer are critical.
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Flat roof drain strainers are important if appropriately designed a strainer is supposed to keep larger objects from going down a drain while allowing smaller debris through with the water flow.
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