Mechanical Unit Roof Curb Detail

Hvac curbs provide structural support for rooftop ac units and other roof mounted equipment.

Mechanical unit roof curb detail.

Length unit length minus 0 875 outside curb width unit width minus 0 875. 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.

As a general rule the curb should be placed directly on the roof support members. Mechanical applications involve exhaust fans rooftop hvac units electrical generators exhaust ducts vent pipes refrigeration lines etc. 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. Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer.

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. Commercial ac manufacturers all have proprietary specs for their curbs. 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. Internally insulated with 1 1 2 thick 3 lbs.

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. Heights to be 8 above finished roof deck or as detailed. Top of all roof curbs shall be level with pitch built into curb when deck slopes. Use tack welding or other suitable fastening method to secure the roof curb in place.

Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer. They also serve as a location for roof penetration to allow cooled air to flow into the building and return air to flow out.