To seismic built-up or seismic pre-manufactured curb

Step 1: Attach curb to roof or building structure

To attach the curb to the building structure, see Anchors.

To attach seismic-rated built-up curb to a roof structure, see Figure 86 for one method of building a curb.

To attach seismic-rated pre-manufactured curb:

• Directly to the roof, see Figure 87.
• To the building structure, see Figure 88.

Follow the manufacturer’s instructions for installing all seismic pre-manufactured curbs.

Step 2: Weld reinforcing angles

For built-up curb, weld reinforcing angles to the metal frame as shown in Figure 86.

Step 3: Install flashing

Figure 86 shows the flashing for built-up curbs. This may be used for pre-manufactured curbs.

Step 4: Attach equipment

Attach the equipment to seismic rated curb using screws as shown in Figure 89. Space the screws according to the manufacturer’s instructions.