Curb rather than anchored to the roof deck.
Seismic roof curb detail.
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.
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.
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.
Front inlet height top bottom rear outlet length.
Become familiar with the roof curb installation procedures.
Bolts should be with nuts and washers.
As a general rule the curb should be placed directly on the roof support members.
Bolts should be placed in every hole provided in the base plate of the curb.
Seismic roof curb seismic roof curb detail.
To avoid wind and windborne debris damage to rooftop ductwork it is recommended that ductwork not be installed on the roof see figure 5.
We ve built more curbs than anybody relying on years of experience and libraries filled with hvac equipment data.
Founded in 1959 and with 5 factories across the country thybar is the oldest and largest roof curb manufacturer in the world.
The width of the supporting structural steel shall be at least as wide as the base plate of the curb.
The goal is to match or exceed the seismic roof curb design value referred to as the ss value.
The attachment of the curb itself also needs to be designed and specified.
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.
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.
Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb.
Curb must be capable of supporting seismic loads of two options.
Seismic curbs see figure 12 seismic curbs are available on a special quoted basis.
Up to 0 75gs up to 2 06gs curb heights vary in increments of 4 00 from 14 00 to 34 00.
The additional requirements are detailed on each stamped submittal drawing.
Flat or sloped.
The src is a seismic wind load rated roof curb engineered for installation in earthquake prone and or high wind areas.
Curbs solidly braced or bolted directly to the building structure without vibration isolation.
The curbs should be anchored to structural steel concrete as fallows.
