Detail Flat Roof Drainage Design Guide

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.

Detail flat roof drainage design guide.

Alwitra flat roof details. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs. 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. A flat roof s design is both efficient and economical.

Flat roofs are hard to replace. Drain locations and deck slope verification for ponding water or deflection. 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. Roof system design life should be a starting point in the selection of roof systems.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. 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. Roof drains zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax. Most buildings utilize a minimum 20 year roof design life.

Along with the benefits of a flat roof come unique challenges. The most critical of these issues is the flat roof drainage systems. A rooftop garden or additional outside living space are the top reasons people choose flat roofs. Details and technical drawings of the flat roof drainage as downloads in the practical pdf dxf and dwg formats.

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. Design assistance services are offered as a courtesy to the roofing. 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.