Mechanical Unit Roof Curb Detail

Roof curb and curb adapter specialists serving north america.

Mechanical unit roof curb detail. Use tack welding or other suitable fastening method to secure the roof curb in place. Length unit length minus 0 875 outside curb width unit width minus 0 875. Mechanical applications involve exhaust fans rooftop hvac units electrical generators exhaust ducts vent pipes refrigeration lines etc. Internally insulated with 1 1 2 thick 3 lbs.

Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer. Commercial ac manufacturers all have proprietary specs for their curbs. Hvac curb systems although rcs does not provide hvac rooftop units we are experts in the field and proudly provide the most critical component the roof curb system that is designed to properly support the weight of the unit and keep the water on the outside of the building where it belongs. As a general rule the curb should be placed directly on the roof support members.

Prefabricated roof curb to be manufactured of prime galvanized steel construction 20 18 16 or 14 gauge as required meeting astm a653 653m with welded corners and with seams joined by continuous water and air tight welds. Specify prefab roof curbs for use with all roof penetrations and roof mounted equipment including and not limited to hvac units duct openings pipe penetrations power roof exhauster intake and relief vents flues or job fabricated items. Top of all roof curbs shall be level with pitch built into curb when deck slopes. They also serve as a location for roof penetration to allow cooled air to flow into the building and return air to flow out.

The curb can also be mounted on a roof deck. Units should not be moved over a roof membrane but should in some manner be lifted from the ground onto the curb or support framework. Architectural applications include unit skylights structural and monument skylights terminations at walls expansion joints roof hatches heat and smoke vents and satellite dish systems. When you install adapter curbs welded rtu rooftop unit curbs or equipment supports for your rooftop hvac package unit going with the wrong curb adapter company can cost you big money and time.

Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer. When setting the unit onto the curb the installer should ensure that a sealing material is positioned between the unit and curb to provide a continuous watertight connection.