Structural Roof Curb Detail

The prefabricated hvac roof curbs must be installed in accordance with instructions and as detailed on drawings.

Structural roof curb detail. Typical roof curbs the curb should be structurally capable of supporting intended loads and designed such that drains power lines etc do not penetrate roof fl ashing. If you have any questions about a product please don t hesitate to call us we will help you get your roofing job done right the first time. Free cad detail download of a prefabricated roof curb to be used in your architectural section cad drawings. Curbs should be sloped to avert water ponding.

Heavy gauge galvanized steel actual thickness determined by unit weight and full height internal dividers add the strength necessary to support the unit without additional framing. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. Seismic calculated curbs are available as reinforced metal curbs or vibration isolation curbs.

The general contractor shall provide all labor material and equipment to completely install the prefabricated hvac roof curbs. A structural engineer predetermines the seismic requirements of a building. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation. This is dictated by the international building codes ibc and california building codes cbc based upon requirements set by the american society of civil engineers asce.

Top of all roof curbs shall be level with pitch built into curb when deck slopes. Curbs should be sloped to avert water ponding. Internally insulated with 1 1 2 thick 3 lbs. Roof curbs also protect the occupants inside the building by preventing the rooftop packaged unit from blowing off the curb during a wind event and potentially falling through the roof structure.

Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer. The curb should be furnished with a wood nailer which provides a minimum of 3 5 of nailer surface mounted at the top of the curb to permit mechanical attachment of. Stamps are available for all 50 states if needed. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.

We try to help our clients in anyway possible. Structural curbs are individually designed to span the existing bar joist at the base transitioning to match specific unit dimensions at the top. Heights to be 8 above finished roof deck or as detailed.