Detail Flat Roof Drainage Design Guide

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.

Detail flat roof drainage design guide.

Along with the benefits of a flat roof come unique challenges. Most buildings utilize a minimum 20 year roof design life. Flat roofs are nothing new nor are some of the proven materials that cover these often expansive roofs such as those found on factories warehouses big and small box stores apartment buildings large public structures and schools universities. Details and technical drawings of the flat roof drainage as downloads in the practical pdf dxf and dwg formats.

Drain locations and deck slope verification for ponding water or deflection. 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. Flat roofs are hard to replace. 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.

A rooftop garden or additional outside living space are the top reasons people choose flat roofs. Since many roofing systems have not been in production for 20 years the designer should consider proven systems as a first step in obtaining roof design life. 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. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

The most critical of these issues is the flat roof drainage systems. Developing the design criteria for a roof drainage plan that will perform with the roofing system to drain the roof is critical prior to the bid process and roof system installation. Roof system design life should be a starting point in the selection of roof systems. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.

This could mean flat roofs may not raise the same red flags they used to. Alwitra flat roof details. A flat roof s design is both efficient and economical.