Primary Roof Drains And Roof Area Drains

Roof drains shall not drain onto a public sidewalk.

Primary roof drains and roof area drains.

Drainage for roofs cascaded down from upper to immediately lower roofs. Paramount to eliminating the threat of roof collapse due to water accumulation is the installation of roof drains or gutters. As we will see in steps 3 4 the size of the roof drain lines is dependent on the square feet of the roof area being served by each roof drain. How far should a primary roof drain be located from the secondary drain.

Discover where to buy. Pitched roofs not surrounded by parapet walls are generally drained by gutters. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond. Drainage for each roof consisted of two pairs of primary and secondary drains.

Drains shall be designed and sized according to the minnesota plumbing code. Siphonic primary roof drains. Because of that no certain distance exists. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.

Roof drains are generally installed on flat roofs or roofs surrounded by parapet walls. The drains should be placed at a maximum of 75 feet in each direction away from each other. A good rule to follow is to provide two roof drains for a total roof area less than 10 000 square feet. A standpipe or dam built within the secondary drain dictates the anticipated water depth.

Siphonic combo primary overflow drain. This form of roof drainage is preferred if a clean exterior appearance is desired. These drains are distinguished by having higher rims. A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage.

An additional roof drain should be added for each 10 000 square foot area. In addition to the primary roof drains there will also be overflow drains which are used for redundancy and sized in the same manner. Siphonic roofdrain with debris guard. Therefore the bottom most recessed roof received the drainage from all upper roof areas.

Zurn offers a full line of combination primary overflow roof drains.