Detail Flat Roof Drainage Design Guide

Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.

Detail flat roof drainage design guide.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. A correctly build flat roof will drain the rainwater quickly and effectively into the gutters without allowing water to collect in depressions and pond on the surface of the roof leading to the build up of silt deposits on the roof and stresses in the membrane when the water freezes a small amount of ponding is inevitable and it should not reduce the. Most buildings utilize a minimum 20 year roof design life. 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. I have a big flat roof 2100 square feet new construction. 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. Flat roof drainage.

This could mean flat roofs may not raise the same red flags they used to. 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. Roof drains zurn plumbing products groupspecification drainage operation 1801 pittsburgh avenue erie pa 16502 phone 814 455 0921 fax.

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. 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. A rooftop garden or additional outside living space are the top reasons people choose flat roofs. 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.

A flat roof s design is both efficient and economical. Roof system design life should be a starting point in the selection of roof systems. Flat roofs are hard to replace. Design assistance services are offered as a courtesy to the roofing.