The strainers over drains are what causes the biggest problem.
Flat roof drainage detail.
A major maintenance issue shared between all types of roof drains is debris removal.
Download free high quality cad drawings blocks and details of roof drains organized by masterformat.
Flat roof drain types.
There are roof coating products available if there isn t enough slant or slope to accomplish this.
On many occasions drains are too high and water cannot flow off.
A flat roof may use interior drains to collect water from the centre of the roof.
Flat roof drains are the most critical components of any commercial roof.
Alwitra flat roof details.
There are three types of drain systems commonly used on flat roofs.
Most of the time strainers that come installed with a drain are not well designed.
Each of these systems has its own pros and cons.
Details and technical drawings of the flat roof drainage as downloads in the practical pdf dxf and dwg formats.
The one challenge with flat roofing is ensuring proper drainage.
The drainage requirements for flat roofs on buildings present some special problems that we describe and illustrate here.
A gravity drainage system on a flat roof differs from the gutter system you find on residential roofs in two key ways.
Most flat roofs suffer from poor drain locations or drain levels that are high.
Drains are responsible for removing water quickly and efficiently.
Unlike other roofing types that are slanted or sloped to allow water to drain automatically flat roofs need a built in drainage system to help remove moisture and debris.
Having sufficient drainage on a flat roof is vital.
Poor drainage can lead to serious issues with flat roofing from leaks to structural damage.
Watch for clogs blockage at the roof drain or scupper.
At page top and at left our photos show a low slope roof surrounded by a parapet.
Roofs of this design will have one or more roof drains or scuppers installed.
Keep in mind all flat roofs have a slope of between five and 15 degrees to allow water to flow into drain systems such as eaves drainage holes or outlets.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.
When designing a roof it is essential to pay close attention to where the drains are.
