Roof Curb Installation Detail

Trane recommends that the roof curb be placed directly on the roof support members and welded into place.

Roof curb installation detail.

Use tack welding or other suitable fastening method to secure the roof curb in place. 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. And installed by an experienced erector. Roof curbs should be supplied by the hvac manufac.

Curbs for roo fi ng systems. Curbs should be sloped to avert water ponding. As a general rule the curb should be placed directly on the roof support members. Contractors should not be asked to supply or install roof.

Do not overlap counter flashing over the top of the roof curb. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. 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. 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.

If the curb is mounted on the roof deck additional support is necessa ry directly below the curb flanges to minimize vibration. In this case additional. 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.

Install roof curbs rib to rib.