There are three types of drain systems on a flat roof.
Roof drains design.
In many instances though not necessarily always you will want the gutter and downpipe sizes to be the same for all gutters and downpipes on the project.
As we will see in steps 3 4 the size of the roof drain lines is dependent on the square feet of the roof area being served by each roof drain.
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Design approach for a given roof configuration the first task is to decide on the number and location of downpipes as this will determine the size of the effective roof areas.
Smith carefully designs and manufactures a full line of roof drains deck drains scupper drains promenade and parking area drains and more to satisfy both the artistic eye of the architect and the calculating mind of the engineer.
Most draining systems on flat roofs have a poor design or are not correctly installed.
The main benefit of inner drains is that the system is hidden from view.
It is very critical to position drains for maximum effect.
Determining the exact roof area and the number of drains is precise work so it requires coordination with the building s architect.
The positioning design and installation of a drainage system are one of the most important factors to have a relatively low maintenance roof.
You also must include half of the area of any vertical walls that may divert rain to the roof.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Or 12 drains required.
The average flat roof does not have an optimized draining system.
The roof is sloped towards the drain through either tapered insulation or through joist modifications below the roofline.
This form of roof drainage is preferred if a clean exterior appearance is desired.
Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.
Inner drains are resistant to freezing but can require careful maintenance to prevent problems.
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These drains are distinguished by having higher rims.
Most of the time there is not a positive pitch to let water drain and that causes ponding.
These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond.
So often we find that inner drains are high on the roof causing water to pool around them.
The result is the number of drains needed.
