Roof drains watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.
Flat roof drain strainers.
There are conditions on a roof that is not practical to lower a drain as illustrated in the videos above.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged.
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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12 1 4 inch od x 7 inches high self locking.
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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Cast iron drain dome strainer self locking.
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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Calculate drains needed.
Smith 2005 g floor drain and adjustable strainer with round low dome grate.
If that s the case then an alternative solution is to fabricate a large strainer that will fit around the drain.
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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.
The design and configuration of a strainer are critical.
Flat roof drain strainers.
12 inch cast iron drain dome strainer.
Roof drains parts accessories floor drains.
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Replaces most popular 12 inch od drain domes 14 15 inch drain bowl for roof drains.
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The above sizing data is offered as a guide only.
This video explains the principle of a drain basin.
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.
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