Roof Curb Height Requirements

Regardless of the model a roof curb is used to mount the assembly so that it sits securely and the hole through the roof is protected.

Roof curb height requirements.

Curb height is the height of curb at shorter wall. All mechanical equipment is required to be set on a structural roof curb attached to the roof deck. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Paint color can be useful to know as well since rooftop curbs can be custom painted to match your roof.

The curb should provide a minimum clearance of 10 inches between the top of the finished roof surface and the top of the wood nailer continuous around the curb perimeter. This is a minimum flashing height. 0 25 inches 6 ft. Specify prefab roof curbs for use with all roof penetrations and roof mounted equipment including and not limited to hvac units duct openings pipe penetrations power roof exhauster intake and relief vents flues or job fabricated items.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Comply with local code requirements for minimum curb height but in no case shall curb height be less than 18 inches as measured from top of bar joist to top of curb nor shall curb height be less than 8 inches as measured from top of roof membrane to top of curb. Curb heights vary in increments of 4 00 from 14 00 to 34 00. Maximum height of tallest wall will be 42 00.

Flat or sloped. Windows and doors are to be a minimum of 16 above the roof line. 0 20 inches 5 ft. Different panels can have different profile styles and rib height requirements.

Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer. See figure 6 6. Minimum flashing height requirements are 8 for all mechanical skylights wall flashings or any other item that extends above the roof line. Vibration isolated curbs see figure 12 vibration isolated curbs is available on a special quoted basis.