Primary And Secondary Roof Drain Sump

Bi functional roof drain allows for connections for both primary and secondary piping within one roof penetration.

Primary and secondary roof drain sump.

A secondary drain placed in a sump will start working as soon as water reaches the top of the standpipe. 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. Providing an immediately adjacent secondary overflow drain next to every primary drain with a separate piping system. Body is cast in a singular ci mold no welded pieces to reduce leak paths.

This is a very cost effective solution to building a wood sump box. 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. 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. 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.

It is fast and easy to install on any type of flat roof. If both the primary drain and overflow drain are installed at the same elevation in one sump. If the sump is 2 or deeper the secondary drain shall serve as the primary drain totally defeating its purpose. Reduces the number of roof drains by combining primary and secondary drains into one.

Primary and or secondary drains installed at the wrong elevation. 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.