Primary And Secondary Roof Drains

It is very important not to place secondary drains in any kind of sumps.

Primary and secondary roof drains.

The secondary system ensures that if the primary system or primary drains are plugged or overloaded the secondary system will handle the rainwater and drain it away protecting the building and its occupants from harm see figure b. The upc also allows for secondary and primary drainage to be combined provided the rainfall rate utilized is doubled and that the secondary drainage ties into the primary drain downstream of the last horizontal offset. 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. The froet drain froet industries llc america s most innovative roof drain manufacturer presents the froet drain roof drain primary and secondary roof drain in one engineered fixture.

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 patented froet drain is an innovative drain product created to solve the dual drain requirement for overflow protection. Where should the secondary drainage be discharged. A secondary drain placed in a sump will start working as soon as water reaches the top of the standpipe.

If discharge is witnessed it s a telltale sign that the primary roof drain may be clogged. Providing an immediately adjacent secondary overflow drain next to every primary drain with a separate piping system. Secondary drainage to pour over top of outlet box if primary clogs. Where primary and secondary roof drains are manufactured as a single assembly the inlet and outlet for each drain shall be independent.