Pre-Installation
CLCH-SVX009J-EN
13
Roof Curb Installation Checklist
See
CLCH-SVN-006*-EN Performance Climate Changer
Air Handler Model UCCA Roof Curb Installation
for
information on installing roof curbs.
It is recommended that the curb be installed directly on the
support members and fastened to the supports using tack
welds or other equivalent methods. Properly supported
decking should be installed inside the air handler section
of the curb when this method is used. See the figure below
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-in. 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.
10. Apply sealant to the four corners.
11. 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
Screw securing roof
felt to rigid insulation
or 2 x 10
Flashing
(field-supplied)
Roofing felt
(field-supplied)
4 x 4 cant
(field-supplied)
Roof deck
Support channels
