Roof Curb Height Requirements

Vibration isolated curbs see figure 12 vibration isolated curbs is available on a special quoted basis.

Roof curb height requirements.

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. 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. Maximum height of tallest wall will be 42 00. 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.

Different panels can have different profile styles and rib height requirements. Windows and doors are to be a minimum of 16 above the roof line. Paint color can be useful to know as well since rooftop curbs can be custom painted to match your roof. All mechanical equipment is required to be set on a structural roof curb attached to the roof deck.

See figure 6 6. 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. 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. Curb heights vary in increments of 4 00 from 14 00 to 34 00.

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. 0 25 inches 6 ft. 0 20 inches 5 ft. 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.

Flat or sloped. This is a minimum flashing height. Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer. Curb height is the height of curb at shorter wall.