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.

Primary and secondary roof drain sump.

Primary and or secondary drains installed at the wrong elevation. Reduces the number of roof drains by combining primary and secondary drains into one. 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. Body is cast in a singular ci mold no welded pieces to reduce leak paths.

Bi functional roof drain allows for connections for both primary and secondary piping within one roof penetration. If the sump is shallower than 2 it will be full of standing water which may freeze and damage the drain and the adjacent roofing. 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. Lsp roof drain sump pan 5 pack is engineered to eliminate standing rainwater by lowering or sumping the zurn z100 primary cast iron roof drain.

The risk for the roofing contractor to install the wrong drain ring and water dam on the wrong drain is quite high. If the sump is 2 or deeper the secondary drain shall serve as the primary drain totally defeating its purpose. Providing an immediately adjacent secondary overflow drain next to every primary drain with a separate piping system. A secondary drain placed in a sump will start working as soon as water reaches the top of the standpipe.

Where primary and secondary roof drains are manufactured as a single assembly the inlet and outlet for each drain shall be independent. This is a very cost effective solution to building a wood sump box. It is fast and easy to install on any type of flat roof.