Seismic Roof Curb Detail

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.

Seismic roof curb detail.

Bolts should be with nuts and washers. Kinetics esr features high frequency noise isolation pads code compliant seismic and wind restraint and access ports for each isolator to inspect level or change springs after equipment placement. The width of the supporting structural steel shall be at least as wide as the base plate of the curb. As a point for reference the york solution unit has a front rear left right and top and bottom sides.

Curbs solidly braced or bolted directly to the building structure without vibration isolation. Bolts should be placed in every hole provided in the base plate of the curb. Vibration isolation roof curb and rail. The conclusive value will be between 0 and 3 73 highest value in california.

The curbs should be anchored to structural steel concrete as fallows. Heavy duty complete vibration isolation roof curb and rail for over 20 ton packaged rooftop units. Roof curb must be square level prior to setting equipment. A minimum of one cross brace will be provided with each curb.

The goal is to match or exceed the seismic roof curb design value referred to as the ss value. See fi gure 6. The maximum spacing between cross braces is 90. Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb.

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. 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.