The design and configuration of a strainer are critical.
Flat roof drain strainers.
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.
Take the roof s total square footage and divide by the total square footage handled by one drain.
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Recommended for installation in flat areas with decks that are constructed of steel wood or concrete these roof drains are suitable for many installations.
The result is the number of drains needed.
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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There are conditions on a roof that is not practical to lower a drain as illustrated in the videos above.
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.
Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor.
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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.
The above sizing data is offered as a guide only.
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Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged.
Roof drains watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.
The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
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Roof drains parts accessories floor drains.
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.
Replaces most popular 12 inch od drain domes 14 15 inch drain bowl for roof drains.
