Seismic Roof Curb Detail

The width of the supporting structural steel shall be at least as wide as the base plate of the curb.

Seismic roof curb detail.

As a general rule the curb should be placed directly on the roof support members. We ve built more curbs than anybody relying on years of experience and libraries filled with hvac equipment data. Use tack welding or other suitable fastening. The additional requirements are detailed on each stamped submittal drawing.

Any roof curb rigid or vibration that have been engineered and stamped to meet current ibc 2015 you may also hear this as complying or calculated. Ss is the mapped maximum credible earthquake five percent dampened spectral response acceleration parameter at short periods as defined in asce 7 10 section 11 4 1. This curb is designed to mate perfectly with the rooftop equipment and comes with a wood nailer to facilitate the attachment of. Seismic curbs see figure 12 seismic curbs are available on a special quoted basis.

The goal is to match or exceed the seismic roof curb design value referred to as the ss value. If the roof curb will be mounted on a new building it can be assembled at any convenient location and installed as soon as the roof support members are in place. Founded in 1959 and with 5 factories across the country thybar is the oldest and largest roof curb manufacturer in the world. Curbs solidly braced or bolted directly to the building structure without vibration isolation.

Curb must be capable of supporting seismic loads of two options. The curbs should be anchored to structural steel concrete as fallows. If ductwork is installed on the roof it is recommended that the gauge of. It is comprised of fully welded galvanized steel and ships ready for jobsite installation.

Bolts should be with nuts and washers. Curb rather than anchored to the roof deck. The src is a seismic wind load rated roof curb engineered for installation in earthquake prone and or high wind areas. Up to 0 75gs up to 2 06gs curb heights vary in increments of 4 00 from 14 00 to 34 00.

The attachment of the curb itself also needs to be designed and specified. Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb. Become familiar with the roof curb installation procedures. To avoid wind and windborne debris damage to rooftop ductwork it is recommended that ductwork not be installed on the roof see figure 5.

Bolts should be placed in every hole provided in the base plate of the curb. Front inlet height top bottom rear outlet length. A sheet metal curb with nailer pre manufactured curb go to page 50 directly connected to a wood roof curb wood curb go to page 56 any rooftop unit connected to a manufactured vibration isolation curb on a post and beam isolation curb on a post and beam go to page 57 roof mounted on a post and beam post and beam go to page 47 large rooftop unit.