Mechanical Unit Roof Curb Detail

Architectural applications include unit skylights structural and monument skylights terminations at walls expansion joints roof hatches heat and smoke vents and satellite dish systems.

Mechanical unit roof curb detail.

Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer. Use tack welding or other suitable fastening method to secure the roof curb in place. 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. Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer.

As a general rule the curb should be placed directly on the roof support members. 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 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. A substantial amount of water was able to enter the building during the hurricane.

This gooseneck was attached with only two small screws. Mechanical applications involve exhaust fans rooftop hvac units electrical generators exhaust ducts vent pipes refrigeration lines etc. Heights to be 8 above finished roof deck or as detailed. Curb installation should be a part of the roof deck not on top of insulation or roofing materials.

Rooftop attachment of lightning protection systems in high wind regions. Length unit length minus 0 875 outside curb width unit width minus 0 875. Internally insulated with 1 1 2 thick 3 lbs. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.

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. Top of all roof curbs shall be level with pitch built into curb when deck slopes. This 30 x 10 x 8 18 000 pound hvac unit was attached to its curb with 16 straps one screw per strap. Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer.