Roof Curb Height Requirements

This is a minimum flashing height.

Roof curb height requirements.

Windows and doors are to be a minimum of 16 above the roof line. 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. 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. 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.

Prior to the application of roofing materials the roofing contractor should make a visual inspection of the deck surface to see that it is ready for the application of roofing materials. Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer. Flat or sloped. 0 25 inches 6 ft.

All mechanical equipment is required to be set on a structural roof curb attached to the roof deck. Maximum height of tallest wall will be 42 00. In no case should the curb be less than 14 inches in height. 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.

Curb heights vary in increments of 4 00 from 14 00 to 34 00. Different panels can have different profile styles and rib height requirements. 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. See figure 6 6.

Standard height of the curbs is approx 20 however it is necessary to measure the height of the upblast exhaust fan just to be sure the overall height to the top of the fan from the roofline is 40 it s properly covered by the 20 height. Paint color can be useful to know as well since rooftop curbs can be custom painted to match your roof. Minimum flashing height requirements are 8 for all mechanical skylights wall flashings or any other item that extends above the roof line. 0 20 inches 5 ft.