GCC Metal Building Curb
Product Information: Metal Building Curb
The Metal Building Curb is a component used for the installation
of roofing systems. It is designed to be compatible with all
standing seam and corrugated roof profiles where the ribs are less
than 4 inches tall. The curb is constructed to ensure a secure and
weather-tight connection between the roof panel and the building
structure.
It is important to note that the installation of the Metal
Building Curb should be done in accordance with the roofing
manufacturer’s installation guide to ensure warranty validity.
Failure to comply with the installation instructions may result in
voiding the product warranty and can pose a risk of personal injury
and property damage.
Product Usage Instructions
- Place the curb in the desired location on the roof panel and
mark the location of the four inside corners of the roof curb. - Cut the roof panel to match the inside dimension of the curb.
On the peak side of the roof, cut it to the inside dimension of the
curb plus 5 inches. - Slit the roof panel back so that the peak side flange can be
tucked underneath the roof panel. - Apply caulking or sealant to the roof panel where the roof curb
flanges will sit on the roof deck. Ensure that all four sides are
caulked. - Position the watershed cricket on the peak side of the roof and
slide the flange (with cricket) underneath the roof panel. - Push the curb flush to the opening on the eave side of the
roof. - Fasten the curb flanges with self-tapping fasteners with
neoprene washers to the roof panels according to local/state code.
Recommended fastener spacing is 4 inches o.c. or less. Securely
fasten the curb to the framing or joists. - After the installation is complete, caulk all joints and edges,
including the back slits. On the eave side, seal the rib to the
interior curb face. On the peak side, the ribs should be capped and
sealed (caps and sealant not provided).
It is recommended to refer to the provided figures and
illustrations in the manual for better understanding of the
installation process.
For further information or assistance, please refer to the
complete Installation, Operation, and Maintenance Manual or contact
our customer support.
Document 484905 Model GCC
Metal Building Curb
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with these instructions will result in voiding of the product warranty and may result in personal injury and/or property damage.
NOTE
Refer to the roofing system installation manual before installing curb to ensure warranty will remain valid.
NOTE
Install roof according to roofing manufacturer’s installation guide before installing any roof curb.
NOTE
Model GCC is compatible with all standing seam and corrugated roof profiles where the ribs are less than 4 inches tall.
Peak side rib should be capped/sealed
Peak Side
Detail B
B
A
Rib Cap Sealant
Eave Side
Installation
1. Place the curb in the desired location on the roof panel and mark the location of the four inside corners of the roof curb.
2. Cut roof panel to inside dimension of curb. On peak side of the roof, cut to the inside dimension of the curb plus 5 inches.
3. Slit roof panel back so peak side flange can be tucked underneath the roof panel. See Figure 1.
4. Apply caulking or sealant to the roof panel where the roof curb flanges will sit on the roof deck. Be sure to caulk all 4 sides.
5. Position the watershed cricket on the peak side of the roof. Slide flange (with cricket) underneath roof panel.
6. Push curb flush to opening on the eave side of the roof.
7. Fasten curb flanges with self-tapping fasteners with neoprene washers to the roof panels per local/state code. Recommended fastener spacing is 4 inches o.c. or less. Fasten through to framing or joists for secure installation.
8. Caulk all joints and edges after installation is complete, including back slits. On eave side, seal rib to interior curb face. On peak side, ribs to be capped and sealed; caps and sealant not provided.
Detail A
NOTE: Images show two roofing types for illustration purposes.
Back Slit
Eave Side
Watershed Cricket
A
Peak Side
Detail A
Back Slit to be sealed
Figure 1
Watershed Cricket
Peak Side
Rib Cap 4″ tall
Eave Side
Metal Building Curb 1
2 484905 · Model GCC, Rev. 3, December 2022
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