Roof Curb Installation Checklist; Cross Section Of Typical Curb Installation On New Construction - Trane CSAA Installation, Operation And Maintenance Manual

Pre-Installation
designed to support the length, width, and weight of
the entire air-handling unit. See
p. 29 for more information.
• Rooftop curb-mounted units must be sealed tightly to
the curb. Use proper sealants and roof-to-curb sealing
techniques to prevent water and air leakage. Refer to
CLCH-SVN05A-EN Roof Curbs for Performance
Climate Changer™ Air Handlers Installation
Instructions.
Note: Preparation of the roof curb or pier mount and roof
openings should be completed prior to lifting the
unit to the roof.

Roof Curb Installation Checklist

See CLCH-SVN05A-EN Roof Curbs for Performance
Climate Changer™ Air Handlers Installation Instructions
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
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
10
"Ceiling Suspension,"
Figure 2.
Support channels
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.
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.
CLCH-SVX07K-EN