Primary Roof Drains And Roof Area Drains

Siphonic primary roof drains.

Primary roof drains and roof area drains.

These drains are distinguished by having higher rims. In addition to the primary roof drains there will also be overflow drains which are used for redundancy and sized in the same manner. A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.

These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond. Siphonic roofdrain with debris guard. Roof drains shall not drain onto a public sidewalk. A good rule to follow is to provide two roof drains for a total roof area less than 10 000 square feet.

Therefore the bottom most recessed roof received the drainage from all upper roof areas. Because of that no certain distance exists. Roof drains are generally installed on flat roofs or roofs surrounded by parapet walls. Siphonic combo primary overflow drain.

Siphonic roof drain w leaf guard. 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. All roofs shall discharge to a storm sewer or drain to daylight at grade at a safe location approved by the building official.

Drains shall be designed and sized according to the minnesota plumbing code. Zurn offers a full line of combination primary overflow roof drains. A standpipe or dam built within the secondary drain dictates the anticipated water depth. Discover where to buy.

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. The drains should be placed at a maximum of 75 feet in each direction away from each other. Pitched roofs not surrounded by parapet walls are generally drained by gutters.

An additional roof drain should be added for each 10 000 square foot area.