This video explains the principle of a drain basin.
Flat roof drain strainers.
They are responsible for properly draining any and all accumulated precipitation.
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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There are conditions on a roof that is not practical to lower a drain as illustrated in the videos above.
Flat roof drain strainers.
To preserve the life of the roof however the debris that collects around them must be removed on a regular basis.
Flat roof drains scuppers gutters and drainage systems on flat roofs.
This is what it looks like after attaching the membrane to the cast iron drain.
Most strainers or domes that cover a drain on flat roofs are poorly designed because they block smaller debris and the strainer becomes clogged.
They become brittle and break.
If that s the case then an alternative solution is to fabricate a large strainer that will fit around the drain.
The design and configuration of a strainer are critical.
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.
A plastic strainer for a flat roof drain is not a good idea.