Roof Curb Installation Detail

Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.

Roof curb installation detail. Roof curbs should be supplied by the hvac manufac. First the basic design of the curb should take into account the roofing components so that it can be properly flashed into the roof system. As a general rule the curb should be placed directly on the roof support members. Trane recommends that the roof curb be placed directly on the roof support members and welded into place.

The curb can also be mounted on a roof deck. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. And installed by an experienced erector. Installing curbs that rest in the flat lower panel area of metal roofing invites water tightness problems since the curb now has to be installed and sealed in the most vulnerable area the surface where rainwater flows.

Contractors should not be asked to supply or install roof. In this case additional. Install roof curbs rib to rib. Curbs for roo fi ng systems.

A canted curb for example should be used for a built up or modified bitumen system roofing system. Turer to the general contractor or building manufacturer. If the roof curb will be mounted on a new building it can be assembled at any convenient location and installed as soon as the roof support members are in place. Use tack welding or other suitable fastening method to secure the roof curb in place.

Curbs should be sloped to avert water ponding.