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.
Mechanical applications involve exhaust fans rooftop hvac units electrical generators exhaust ducts vent pipes refrigeration lines etc.
Use tack welding or other suitable fastening method to secure the roof curb in place.
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.
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.
Architectural applications include unit skylights structural and monument skylights terminations at walls expansion joints roof hatches heat and smoke vents and satellite dish systems.
They also serve as a location for roof penetration to allow cooled air to flow into the building and return air to flow out.
Top of all roof curbs shall be level with pitch built into curb when deck slopes.
Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer.
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.
Commercial ac manufacturers all have proprietary specs for their curbs.
Heights to be 8 above finished roof deck or as detailed.
Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer.
Internally insulated with 1 1 2 thick 3 lbs.
As a general rule the curb should be placed directly on the roof support members.
The curb can also be mounted on a roof deck.
Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer.
Roof curb and curb adapter specialists serving north america.
