Recessed lights, often called pot lights or can lights, are everywhere in modern homes. They look clean, they’re easy to live with, and they punch a lot of holes through your ceiling into the attic. That last part is where things get interesting from an insulation and fire safety standpoint.

If you’re planning to top up your attic insulation, there’s one detail about your pot lights you need to check first. It comes down to two letters: IC.

What Does IC-Rated Mean?

IC stands for “Insulation Contact.” An IC-rated recessed light fixture is built and tested to safely have insulation packed directly around and on top of it.

A non-IC-rated fixture is the opposite. It’s designed to dissipate heat into open air, which means it requires at least 3 inches of clearance from any insulation on all sides, plus clearance from any combustible material above

Both types look nearly identical from inside your room. The difference is hidden up in the attic, stamped on the metal housing of the can.

Why This Matters When You Insulate

Here’s where the fire risk comes in. If a homeowner or installer blows cellulose or fiberglass insulation over a non-IC-rated can, the fixture has no way to release heat. The bulb, the wiring, and the housing all heat up well past what they were designed for.

In the best case, the fixture’s thermal protector will trip, and the light will cycle on and off as it overheats. As annoying as this can be, it’s a critical warning sign.

In the worst case, the heat scorches the surrounding wood framing or ignites the insulation itself. House fires from improperly insulated recessed lights are well-documented, which is exactly why building codes now require either IC-rated fixtures or proper clearance.

This is especially relevant in Manitoba homes built before the early 2000s, where original recessed lighting was often non-IC-rated, and where attic insulation is now being upgraded to current standards.

How to Tell What You Have

• Push the insulation aside around a recessed light housing.
• Look on the metal can for a stamped or stickered label.
• You’re looking for “IC” or “IC-AT” markings. If you see “Non-IC” or no IC marking at all, treat it as non-IC-rated.
• If the label is unreadable or the housing looks old and rusty, assume it’s non-IC.

The Fix

• Replace the housing: A licensed electrician can swap the old can for a modern IC-AT (IC plus airtight) fixture without changing the trim or bulb style you see from below. It’s usually the cleanest long-term solution.
• Switch to surface-mount LED disc lights: An electrician can install these over the existing electrical box so they don’t penetrate the ceiling, which means there’s nothing to insulate around at all.
• Build a fire-safe enclosure: Less common today, but a code-compliant box around the fixture can preserve the required clearance. It’s a workaround that adds labour and still leaves a cold spot in your insulation.

Whichever route you take, the electrical work needs to happen before the new insulation goes in. 

Talk to Summit Before Topping Up Your Attic

If we spot non-IC-rated cans, we’ll flag them and recommend connecting with a licensed electrician to get the fixtures sorted before we start the insulation work. 

If you’re in Gretna or anywhere in southern Manitoba and thinking about an attic upgrade, give us a call, and we’ll take a look at what you’re working with.