Sizing a roof water drain.
Roof water drain gothic.
Draining water away from your home starts with installing a sound gutter system that has extensions to carry the water away from your home.
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.
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.
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.
Water falls on the roof and gravity draws it into the drain and down the pipes.
Still the function of the two drains is the same.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
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.
A flat roof will have a watertight surface with a fall of 1 in 60 or 1 in the case of lead.
A flat roof may use interior drains to collect water from the centre of the roof.
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The pitch of a pitched roof is determined by the construction material of the covering.