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.
Roof drain cutouts for leaves and junk.
A major maintenance issue shared between all types of roof drains is debris removal.
Regular cleaning and unblocking of the drains gutters and scuppers is mandatory.
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This video explains the principle of a drain basin.
This may include dirt gravel leaves and other foreign materials.
A siphonic roof drain looks much like a traditional roof drain.
Other than the baffle a siphonic roof drain has the same features as a traditional roof drain including a.
So if a mesh of leaves forms over the drain cover it will not block water from flowing under or even through some part of the drain cover.
The best type for the application depends on several factors such as the size and slope of the roof the desired appearance and how much regular maintenance the drain system might need.
These drains are usually covered with a strainer that stops leaves and debris from getting into the drain and pipes.
Sizing the drains for each system including the number of drains required is based on.
Roof drains for flat or low slope roofs come in a few standard types.
Drain guards are available for small round drains.
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Then shorten the drain pipe and reconnect the pipe to the drain.
The distinguishing feature of a siphonic roof drain is the air baffle.
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This air baffle is engineered and tested to prevent air from entering the piping system at peak flows.
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The water runs toward the drain down the internal pipes and then into a drainage system below the building.
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The debris can accumulate in this drain basin and the water can still flow freely through the strainer.
It is important to keep these drains and pipes unclogged as the water will pool on the roof which can lead to leakage.
Fitting similar to an upside down strainer cup the drain guard s slots allow water to flow through while blocking the leaves away from the drain s surface.
To cut a square area of the roof decking away around the drain.
After the roof is reconnected to the drain water can freely flow into the drain.