Roof Top Unit Anchoring To Curb Detail

The roof curb is the interface between the building and the rooftop unit.

Roof top unit anchoring to curb detail.

If not properly anchored fan systems and cowlings can become windborne. Two cables are recommended for areas with less than 120 mph wind speed. Prior to setting the unit onto the curb the installer should ensure that a sealing material is positioned between the unit and the curb to provide a watertight connection. Specifications prefabricated roof curb to be manufactured of prime galvanized steel construction 20 18 16 or 14 gauge as required meeting astm a653 653m with welded corners and with seams joined by continuous water and air tight welds.

It supports the rooftop unit and transfers the load onto the roof s structural members streamlines ductwork connections and provides the means to complete the weatherproof seal with the roof. Sheet metal roof curb by others. 2 05 1 52 supported roof top equipment compatible sheet metal roof curbs will allow the attachment of the restraint elements to their. The primary function of the curb is to keep weather out while supporting flashing the equipment on it.

Roofi ng may be completed after setting the unit. Ssm fabricates roof curbs that respond to a number of different conditions. Ksr 2 8 67 free ht. Curb should be placed directly on the roof support members.

Roof top mechanical equipment comes in all shapes and sizes. Four cables for regions with 120 mph winds. The roof curb should be installed by an experienced erector. And in this one sentence lie the benefits and the detriments we face in the roof curb business everyday.

Neoprene weather seal by kinetics. Fans should be anchored to the curb with at least two screws on each side and cowlings should be attached to the curb with steel cables. The curb can also be mounted on a roof deck. Ssm makes roof curbs to match.

Use tack welding or other suitable fastening method to secure the roof curb in place. Table 1 lists the outside to outside dimensions for over all width and length of unit roof curb 2x4 nailer pipe chase roof curb roof curb angle gutter not shown notched for gutter and unit joint gutter pipe chase roof curb unit roof curb gasket. Prefabricated roof curbs have been in use since the roof has been utilized for something other than keeping weather out. In this case additional nailing plates must be provided directly below the flanges of the curb to give further support and to minimize vibration.

The rooftop unit may be mounted immediately after the curb is installed. Exhaust fans hvac equipment or other specialty devices of all kinds can be accommodated by our curbs. Pre fabricated fully assembled roof curbs will reduce installation time and costs by ensuring compatibility between the rooftop unit curb and roof openings. A typical unit roof curb and unit base cross section without a pipe cabinet is shown in figure 14.