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Pre-Installation Requirements
CAH-SVX01A-EN 9
Figure 1. Cross section of typical curb installation on new construction
Roof Curb
Installation
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 1)
Typical Curb Installation
Checklist
• Verify that the roof structure can
adequately support the
combined weight of the unit and
curb assembly.
• Ensure that the selected
installation location provides
sufficient service and operational
clearances.
• Remove any twist within the curb
due to roof supports and square
the curb.
• Level the curb.
• Secure the curb to the roof
support members.
• Install 2-inch thick boards or rigid
insulation around the curb.
• Install cant strips around the
curb.
• Bring field supplied roofing felt
up to the top of the curb nailing
strips. ail felt into place.
• 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
.