Recessed Luminaires — Clearance and IC Rating
Recessed lights build up heat, so non-IC fixtures need clearance from insulation and combustibles, while IC-rated fixtures may contact insulation.
Why this code exists
Insulation packed against a hot can light traps heat and has literally started attic fires; the IC rating tells you whether that is safe.
If a recessed can is not marked IC, insulation has to be kept back three inches and combustibles cleared. IC-rated cans are built to sit in contact with insulation safely.
With old incandescent cans this was a real fire risk. LED retrofits run much cooler, but you still have to respect the rating that is stamped on the housing.
When it applies
Recessed cans run hot, so this rule protects the framing and insulation around them. A non-IC fixture needs air space kept clear of insulation and combustible material, while an IC-rated fixture is built to sit in direct contact with insulation without overheating. Which one you have determines what can touch it.
Common mistakes
- Burying a non-IC can under blown-in attic insulation and creating a slow heat trap.
- Assuming every can is IC-rated instead of checking the label.
- Stuffing higher-wattage lamps into a fixture than its rating allows.
In the field
In an insulated attic I always spec IC-rated, airtight cans, or better yet LED units built for the ceiling. It keeps the heat down and the homeowner's energy bill lower too.
I have pulled charred, browned insulation off old non-IC cans in more than one attic. Now I check the label first — if it does not say IC, the insulation stays back, no exceptions.
See full history
- 1940 — Clearance requirements for recessed fixtures established.
- 1978 — IC (insulation contact) rating introduced.
Related codes
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