A roof curb is a raised, weatherproof support structure that mounts rooftop HVAC equipment, exhaust fans, skylights, and other mechanical units. It provides a secure mounting surface, helps prevent water intrusion, and ensures proper airflow, insulation, and long-term roof integrity. Roof curbs are available in standard and custom sizes to meet the requirements of virtually any roofing system or equipment.
SMARTCurb. — HVAC Supplies by Taylor Metals
A curb adapter is a custom-fabricated transition frame that allows new rooftop HVAC equipment to fit onto an existing roof curb. It eliminates the need to remove and replace the original curb, reducing installation time, roofing costs, and building disruption. Curb adapters are custom-built to match both the existing curb and the new unit, making equipment replacement faster, easier, and more cost-effective.
Roof Curbs
Custom curbs built to your equipment footprint and roof pitch. Each type spins in 3D.
View curbs →
Drain Pans
Custom welded pans, galvanized through 316 stainless. Configure size and outlets.
Configure & quote →New · Try it
Curb Adapter Calculator
Replacing a rooftop unit? Enter the old and new unit — we size the adapter and build it live in 3D. Give it a try.
Open the calculator →Choose the existing rooftop unit and the new one — the adapter is built live from manufacturer-verified curb data in real 3D, with every dimension showing where it came from. No unit on the list? Enter your dimensions below and the model builds as you type. Request your quote for fabrication.
LIVE
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Existing unit (on the roof)
New unit (being installed)