If you are considering an epdm flat roof for all or part of your building work then a key question is how water will drain away from the flat surface.
Flat roof drainage design guide.
Calculate drains needed.
By mark brinkley 26 may 2020.
With a new structure in the design stages or part completed you need to know that your blueprint is going to work.
Here we ll discuss types of flat roofing.
Interior drains gutters and scuppers.
To design a sloped or flat roof drainage system we need to know the anticipated maximum rainfall rate and the flat or projected roof area.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.
There is a wide variety of flat roof materials available each with its own advantages and drawbacks.
Guide to flat roofing drainage systems and epdm.
When designing a roof it is essential to pay close attention to where the drains are.
This guide explains the advantages and disadvantages of the three most common flat roof drainage solutions.
Why flat roof drainage is important.
Flat roof design guide some bauder waterproofing systems are bba approved for use with zero falls but back falls are not acceptable and should be corrected.
The most critical of these issues is the flat roof drainage systems.
Your building and location can help determine which drain will fit your roof needs.
The result is the number of drains needed.
To help you choose the right one here s a guide to the five best flat roof drainage systems and why they re such a vital part of keeping it in perfect condition.
Choosing a flat roof design.
Flat roofing does not drain naturally like sloped roofs that can rely on the force of gravity to remove water.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
Along with the benefits of a flat roof come unique challenges.
On many occasions drains are too high and water cannot flow off.
The above sizing data is offered as a guide only.
Built up roofing bur this multi layer roof design is a proven system that has been around for generations.
In order to ensure a finished surface with zero fall a design fall of 1 80 should be used and a detailed structural analysis should account for construction tolerances settlement and for.
What is the general area of a flat 1 4 1 0 slope single ply roof for each roof drain ratio for the number of roof drains roof area.
The following outlines ways to build protect and reinforce your roof.
There are many advantages to using a flat roof.
Having sufficient drainage on a flat roof is vital.
Most flat roofs suffer from poor drain locations or drain levels that are high.
Some pipes are too small to handle the volume of the water.
Take the roof s total square footage and divide by the total square footage handled by one drain.
The good news is that there are a variety of drainage options for your flat roof each with their own benefits and drawbacks.
