Primary And Secondary Roof Drain Sump

Reduces the number of roof drains by combining primary and secondary drains into one.

Primary and secondary roof drain sump.

The secondary drain installed at too low of an elevation will cause almost permanent ponding of water around the drain light duty parts. This is a very cost effective solution to building a wood sump box. If both the primary drain and overflow drain are installed at the same elevation in one sump. It is very important not to place secondary drains in any kind of sumps.

Where roof drains are required secondary emergency overflow roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. The better choice if it can be accommodated is one of the first two methods where overflow at the exterior of the building roof is provided without the need for secondary drainage piping. If the sump is 2 or deeper the secondary drain shall serve as the primary drain totally defeating its purpose. A secondary drain placed in a sump will start working as soon as water reaches the top of the standpipe.

It is fast and easy to install on any type of flat roof. Providing an immediately adjacent secondary overflow drain next to every primary drain with a separate piping system. Can be installed by the novice and pro alike. The risk for the roofing contractor to install the wrong drain ring and water dam on the wrong drain is quite high.

Bi functional roof drain allows for connections for both primary and secondary piping within one roof penetration. Primary and or secondary drains installed at the wrong elevation. Where primary and secondary roof drains are manufactured as a single assembly the inlet and outlet for each drain shall be independent.