Flat Roof Drainage Design Guide

The most critical of these issues is the flat roof drainage systems.

Flat roof drainage design guide. Which type of rainwater outlet can prove beneficial to the design and performance of roof drainage and ultimately the building. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. The result is the number of drains needed. Flat roof drainage falls into 2 main categories gravity drainage and syphonic drainage.

Some pipes are too small to handle the volume of the water. The above sizing data is offered as a guide only. 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. Once the roof levels are designed and approved the selection of the rainwater outlets can be reviewed.

This guide explains the advantages and disadvantages of the three most common flat roof drainage solutions. The need for flat roof drainage in order to prevent water accumulation and moisture damage flat roofs need to be equipped with special drainage systems. Calculate drains needed. 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.

On many occasions drains are too high and water cannot flow off. Along with the benefits of a flat roof come unique challenges. With a new structure in the design stages or part completed you need to know that your blueprint is going to work. Guide to flat roofing drainage systems and epdm.

When designing a roof it is essential to pay close attention to where the drains are. Flat roofing does not drain naturally like sloped roofs that can rely on the force of gravity to remove water. Interior drains gutters and scuppers. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.

Having sufficient drainage on a flat roof is vital. A rooftop garden or additional outside living space are the top reasons people choose flat roofs. Flat roof drainage system specifications designs troubleshooting problems solutions for interior drains on flat building roofs flat roof drains scuppers and screens questions answers about keeping the flat roof drainage system working or about installing new drains in a flat roof. Your building and location can help determine which drain will fit your roof needs.

Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. Why flat roof drainage is important. Most flat roofs suffer from poor drain locations or drain levels that are high. Flat roofs are hard to replace.

Type of flat roof drainage each drainage low point roof sub area is allocated a roof drain and an overflow drain.