Primary Roof Drains And Roof Area Drains

Siphonic roof drain w leaf guard.

Primary roof drains and roof area drains.

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. These drains are distinguished by having higher rims. All roofs shall discharge to a storm sewer or drain to daylight at grade at a safe location approved by the building official. A secondary roof drain achieves its function by controlling the water build up.

Because of that no certain distance exists. Discover where to buy. Drainage for roofs cascaded down from upper to immediately lower roofs. A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage.

A good rule to follow is to provide two roof drains for a total roof area less than 10 000 square feet. Siphonic primary roof drains. In addition to the primary roof drains there will also be overflow drains which are used for redundancy and sized in the same manner. Pitched roofs not surrounded by parapet walls are generally drained by gutters.

Siphonic combo primary overflow drain. Roof drains are generally installed on flat roofs or roofs surrounded by parapet walls. How far should a primary roof drain be located from the secondary drain. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond.

Zurn offers a full line of combination primary overflow roof drains. An additional roof drain should be added for each 10 000 square foot area. Paramount to eliminating the threat of roof collapse due to water accumulation is the installation of roof drains or gutters. Therefore the bottom most recessed roof received the drainage from all upper roof areas.

A standpipe or dam built within the secondary drain dictates the anticipated water depth. This form of roof drainage is preferred if a clean exterior appearance is desired. Siphonic roofdrain with debris guard. Drains shall be designed and sized according to the minnesota plumbing code.

Roof drains shall not drain onto a public sidewalk.