Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged.
Flat roof drain strainers.
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.
Calculate drains needed.
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If that s the case then an alternative solution is to fabricate a large strainer that will fit around the drain.
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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The design and configuration of a strainer are critical.
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Roof drains watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.
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.
Recommended for installation in flat areas with decks that are constructed of steel wood or concrete these roof drains are suitable for many installations.
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There are conditions on a roof that is not practical to lower a drain as illustrated in the videos above.
This video explains the principle of a drain basin.
The above sizing data is offered as a guide only.
Take the roof s total square footage and divide by the total square footage handled by one drain.
The result is the number of drains needed.
Flat roof drain strainers.
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