Structural Roof Curb Detail

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.

Structural roof curb detail. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation. 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. Structural curbs are individually designed to span the existing bar joist at the base transitioning to match specific unit dimensions at the top.

The prefabricated hvac roof curbs must be installed in accordance with instructions and as detailed on drawings. The general contractor shall provide all labor material and equipment to completely install the prefabricated hvac roof curbs. 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. In many cases florida building code fbc compliant roof curbs also feature seismic protection as well.

Section 07721 prefabricated hvac structural roof curbs part 1 general 1 01 summary a. 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. 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. 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. Curbs should be sloped to avert water ponding. A structural engineer predetermines the seismic requirements of a building.

Stamps are available for all 50 states if needed. 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. Top of all roof curbs shall be level with pitch built into curb when deck slopes. Heights to be 8 above finished roof deck or as detailed.

Below are links to all our products downloadable roof details and drawings. Curbs should be sloped to avert water ponding. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.