A roof curb is a raised framed or manufactured base built around a roof opening. It is commonly used to support certain skylights, roof hatches, vents, or rooftop equipment.
Why It Matters
A roof curb helps lift the opening above the roof surface so the skylight or equipment can be supported, fastened, and flashed correctly. This is especially important where water, snow, debris, or roof drainage could collect around an opening.
Common Problems
Common issues include curbs that are too low, poorly flashed curb corners, deteriorated curb materials, improper integration with underlayment, and equipment installed without following manufacturer requirements.
Building Codes & Industry Standards
Roof curbs should be sized, fastened, flashed, and integrated according to the product manufacturer instructions, roofing system requirements, and applicable building code provisions.
Exterior Echelon Notes
Exterior Echelon looks at roof curbs when evaluating skylights, roof penetrations, and rooftop equipment because the curb detail can affect leak resistance, drainage, and long-term roof performance.
