Primary And Secondary Roof Drain Sump

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.

Primary and secondary roof drain sump.

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. It is very important not to place secondary drains in any kind of sumps. Bi functional roof drain allows for connections for both primary and secondary piping within one roof penetration.

Where primary and secondary roof drains are manufactured as a single assembly the inlet and outlet for each drain shall be independent. If the sump is 2 or deeper the secondary drain shall serve as the primary drain totally defeating its purpose. It is fast and easy to install on any type of flat roof. Primary and or secondary drains installed at the wrong elevation.

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 secondary drain installed at too low of an elevation will cause almost permanent ponding of water around the drain light duty parts. 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 shallower than 2 it will be full of standing water which may freeze and damage the drain and the adjacent roofing.

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. Can be installed by the novice and pro alike. Body is cast in a singular ci mold no welded pieces to reduce leak paths.