A flat roof will have a watertight surface with a fall of 1 in 60 or 1 in the case of lead.
Roof water drain gothic.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
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A flat roof may use interior drains to collect water from the centre of the roof.
Gargoyle water spouts or rain spouts preceded downspouts which drain water from rain gutters into a drain down pipe or downspout and have a horizontal downspout extension at the bottom end of the downspout that carries the rain water away from the foundation.
Adding a gentle downward slope to the ground around your home is also helpful.
These drains are like the drain at the bottom of your shower except that the roof drain has a larger strainer to protect it from debris.
Sizing a roof water drain.
The first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location.
The water drains into a gutter that is fed into a downpipe.
Without adequate drainage excess water can damage your roof walls foundation and landscaping.
The pitch of a pitched roof is determined by the construction material of the covering.
Gargoyle has been defined as a water spout which projects from a roof gutter and is designed to drain or throw the rain water away from the walls of a building.
Still the function of the two drains is the same.