Installing Roof Curb On Metal Roof

Install any support framing necessary at this time.

Installing roof curb on metal roof.

Placing the curb on and attaching it to the ribs also allows better transitioning from under the roofing on the upslope end to cover the roof on the downslope end. Do not use fasteners that are long enough to fully penetrate the tectum. 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. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer.

The primary function of the curb is to keep weather out while supporting flashing the equipment on it. Curb installation should be a part of the roof deck not on top of insulation or roofing materials. Supplied by others 3. 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.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Prefabricated roof curbs have been in use since the roof has been utilized for something other than keeping weather out. Place roof curb back into position and mark the perimeter of the bottom curb flange onto the. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.

Set roof curb in position on top of roof panel. It is important for the a c contractor to mark exactly where the curb should be i. Install the roofing screws vertically along each rib in the panel. Do not oversize relief cuts 4.

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