CLCH-SVX07C-EN 15
Pre-Installation Requirements
1. Verify that the roof structure can adequately support the combined weight of the unit and curb
assembly.
2. Ensure that the selected installation location provides sufficient service and operational
clearances.
3. Remove any twist within the curb due to roof supports and square the curb.
4. Level the curb.
5. Secure the curb to the roof support members.
6. Install 2-inch thick boards or rigid insulation around the curb.
7. Install cant strips around the curb.
8. Bring field supplied roofing felt up to the top of the curb nailing strips. Nail felt into place.
9. Install field supplied flashing under the lip of the curb flanges and over the felt.
Apply sealant to the four corners. Caulk all joints between the curb and the roof. Attach the gasket
material to the curb’s top flanges (entire perimeter) and to the supply and return air duct opening
panel flanges.
Figure 2. Cross section of typical curb installation on new construction
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