Seismic Roof Curb Detail

Vibration isolation roof curb and rail.

Seismic roof curb detail.

Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb. The curbs should be anchored to structural steel concrete as fallows. The width of the supporting structural steel shall be at least as wide as the base plate of the curb. Heavy duty complete vibration isolation roof curb and rail for over 20 ton packaged rooftop units.

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. Roof curb must be square level prior to setting equipment. The conclusive value will be between 0 and 3 73 highest value in california. Seismic roof curb seismic roof curb detail.

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. As a point for reference the york solution unit has a front rear left right and top and bottom sides. Bolts should be placed in every hole provided in the base plate of the curb. A minimum of one cross brace will be provided with each curb.

Curbs solidly braced or bolted directly to the building structure without vibration isolation. Insignia is shown on curb and unit detail drawings. 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. See fi gure 6.

The goal is to match or exceed the seismic roof curb design value referred to as the ss value. 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. The additional requirements are detailed on each stamped submittal drawing.