If the roof curb will be mounted on a new building it can be assembled at any convenient location and installed as soon as the roof support members are in place.
Roof mtd ac curb detail.
Mike tavolacci marked exactly where the curb would be positioned on the roof.
The curb should be furnished with a wood nailer which provides a minimum of 3 5 of nailer surface mounted at the top of the curb to permit mechanical attachment of.
Typical roof curbs the curb should be structurally capable of supporting intended loads and designed such that drains power lines etc do not penetrate roof fl ashing.
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Here is the flat roof curb installation process.
A galvalume coated roof doesn t mean that a galvanized steel roof curb is the best thing to use in fact galvanized roof curbs are known to rust corrode and leak particularly along weld joints as soon as a year after installation.
As a general rule the curb should be placed directly on the roof support members.
We cut the epdm rubber exactly where the markings were.
Counter flashing should extend to the bottom of the roof curb drip lip.
Attach counter flashing with fastener through the wooden nailer.
Roof curbs are support structures for fans and ventilators.
Do not overlap counter flashing over the top of the roof curb.
They can be selected to fit the specific type of roof such as flat pitched or ridged.
Roof curbs for standing seam metal roofs pick the proper material.
There are many options available to make sure all building requirements are met.
Use tack welding or other suitable fastening method to secure the roof curb in place.
The curb in the video below was installed on an epdm single ply roof membrane.