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General Assembly
1. Measure curb cap of device to be mounted on the
adjustable curb. Be sure to obtain maximum outside
dimensions while measuring. Subtract 1
(
3
⁄
inch allowance per side) to determine outside
4
square dimension of the adjustable curb.
2. Insert the center mullion into corner and plumb,
and that the dimension across the top of the curb
(outside-to-outside) is what was calculated in Step 1.
Then fasten center mullion to corner section through
pre-drilled holes with self drilling screws (minimum 5
screws per joint).
3. Apply sealant strips (supplied) over all vertical and
horizontal joints.
4. Apply rubber gasket on top of curb.
NOTE: No replacement parts available.
General Installation
NOTE: Not for rubber roofs - if rubber roof, refer to
installation recommended by roof manufacturer.
1. Remove roofing material where roof penetration is
to be made and provide a 10 inch wide clearance
around perimeter of hole in roof.
2. Apply roofing cement around roof opening.
3. Place and center curb over hole in roof so it sits on
roofing cement.
4. Secure curb to roof decking using a minimum of
3 fasteners per side and 2 per corner (not included).
5. Field flash - flashing should extend over 4 inch wide
horizontal.
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
2
483836 • Adjustable Roof Curbs, Rev. 2, March 2019
1
⁄
inch
2
Caulking
Center
Mullion
Copyright 2019 © Greenheck Fan Corporation
Corner
Section
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