What is the proper way to set a curb adapter when replacing an old RTU?
3rd YearRoof Work & CurbsRED · Stop / Verify
Clean the top flange of the existing old roof curb thoroughly and remove all degraded old foam gasket material.
Plain-English answer
Clean the top flange of the existing old roof curb thoroughly and remove all degraded old foam gasket material.
Apply a thick, continuous bead of butyl caulking or heavy 1 2 1 -inch foam gasket tape around the entire perimeter of the old curb.
Lower the heavy custom steel curb adapter directly over the old curb using a crane, aligning the internal supply and return air drop openings perfectly. Screw or weld the adapter securely to the old curb before setting the new RTU on top.
Field checklist
- Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
- Clean the top flange of the existing old roof curb thoroughly and remove all degraded old foam gasket material.
- Apply a thick, continuous bead of butyl caulking or heavy 1 2 1 -inch foam gasket tape around the entire perimeter of the old curb.
- Lower the heavy custom steel curb adapter directly over the old curb using a crane, aligning the internal supply and return air drop openings perfectly. Screw or weld the adapter...
Ask Foreman
Hey boss, I’m on roof work & curbs and need verification before I touch this: What is the proper way to set a curb adapter when replacing an old RTU? Do you want me to stop here and check the approved detail, submittal, or inspector/manufacturer requirement first?
Verify before acting
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.