Seismic Roof Curb Detail

Curb rather than anchored to the roof deck.

Seismic roof curb detail.

Additional roof curb anchoring and methods of securing equipment to the curb are also a requirement and must be adhered to for the certification to be valid. It is comprised of fully welded galvanized steel and ships ready for jobsite installation. 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. 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.

This curb is designed to mate perfectly with the rooftop equipment and comes with a wood nailer to facilitate the attachment of. The width of the supporting structural steel shall be at least as wide as the base plate of the curb. The curbs should be anchored to structural steel concrete as fallows. Use tack welding or other suitable fastening.

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. Curbs solidly braced or bolted directly to the building structure without vibration isolation. The src is a seismic wind load rated roof curb engineered for installation in earthquake prone and or high wind areas.

Bolts should be placed in every hole provided in the base plate of the curb. 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 with nuts and washers. Seismic roof curb seismic roof curb detail.

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. Up to 0 75gs up to 2 06gs curb heights vary in increments of 4 00 from 14 00 to 34 00. The goal is to match or exceed the seismic roof curb design value referred to as the ss value.

Curb must be capable of supporting seismic loads of two options. Become familiar with the roof curb installation procedures. 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.

Flat or sloped. If ductwork is installed on the roof it is recommended that the gauge of. 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.