Primary And Secondary Roof Drain Sump

If both the primary drain and overflow drain are installed at the same elevation in one sump.

Primary and secondary roof drain sump.

It is fast and easy to install on any type of flat roof. 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. Bi functional roof drain allows for connections for both primary and secondary piping within one roof penetration.

Body is cast in a singular ci mold no welded pieces to reduce leak paths. A secondary drain placed in a sump will start working as soon as water reaches the top of the standpipe. 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. It is very important not to place secondary drains in any kind of sumps.

This is a very cost effective solution to building a wood sump box. 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. Providing an immediately adjacent secondary overflow drain next to every primary drain with a separate piping system.

If the sump is 2 or deeper the secondary drain shall serve as the primary drain totally defeating its purpose. Where primary and secondary roof drains are manufactured as a single assembly the inlet and outlet for each drain shall be independent. The risk for the roofing contractor to install the wrong drain ring and water dam on the wrong drain is quite high.