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Pre-Installation
Roof Curb Installation Checklist
See Roof Curbs For Performance Climate Changer™ Air
Handlers Model UCCA for Outdoor Applications Sizes 3-30 –
Installation Instructions (CLCH-SVN006*-EN) 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
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
4 x 4 cant
(field-supplied)
(field-supplied)
Roof deck
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.
14
Support channels
CLCH-SVX009L-EN
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