Installing Roof Curb On Metal Roof

Measure mark and cut reliefs in bottom curb flanges at each roof panel rib front and rear.

Installing roof curb on metal roof.

Prefabricated roof curbs have been in use since the roof has been utilized for something other than keeping weather out. It is important for the a c contractor to mark exactly where the curb should be i. And in this one sentence lie the benefits and the detriments we face in the roof curb business everyday. This type of curb has the added benefit of being able to be installed either during the roof installation of after the roof is finished.

The primary function of the curb is to keep weather out while supporting flashing the equipment on it. Do not use fasteners that are long enough to fully penetrate the tectum. Supplied by others 3. Install any support framing necessary at this time.

Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation. Do not oversize relief cuts 4. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Set roof curb in position on top of roof panel. Install the roofing screws vertically along each rib in the panel. Curb installation should be a part of the roof deck not on top of insulation or roofing materials. Place roof curb back into position and mark the perimeter of the bottom curb flange onto the.

Metal roofing should be installed over tectum using self drilling self tapping screws of similar metal and of sufficient length to go well into the tectum.