Most renovation money goes where you can see it. Attic insulation goes where you can't — and quietly outperforms almost all of it. Heat rises, and the ceiling is where your house loses it. In an Ontario winter, bringing an under-insulated attic up to standard cuts heating bills, evens out cold rooms, and prevents ice dams. It's the rare upgrade that pays you back in a few winters and then keeps paying.
The Quick Check
Go up and look. The current Ontario target for attic insulation is R-60 — roughly 16–18 inches of blown-in insulation. The field test is simpler than a tape measure: if you can see the tops of the ceiling joists, you're under-insulated. Joists are about 9 inches deep, so visible joists mean you're at half the target or less. While you're up there, note whether the depth is even — insulation that's mounded in the middle and thin at the eaves is almost as common as too little overall.
Signs You Don't Have Enough
- Ice dams along the eaves in winter — heat escaping through the ceiling melts roof snow, which refreezes at the edge.
- High heating bills that don't match the size of the house.
- Cold upstairs rooms and big temperature differences between floors.
- Uneven snow melt on the roof — patches that clear early mark where heat is escaping.
- A furnace that runs constantly on cold days just to hold temperature.
Your Options: Blown-In, Batts, and Foam
- Blown-in cellulose. Made from recycled material treated for fire resistance, it settles into every gap and around every obstruction. Excellent coverage for the price — the most common choice for topping up an attic.
- Blown-in fiberglass. Similar application, doesn't settle as much over time, and handles moisture a little differently. Comparable cost and performance in most attics.
- Batts. Pre-cut rolls suit new framing or open, regular joist bays. In an existing attic full of wiring, ducts, and odd angles, batts leave gaps — and gaps are where the heat goes.
- Spray foam. The premium option, and the right one for cathedral ceilings and rim areas where air sealing matters most. For a standard flat attic, blown-in usually delivers the same result for far less.
Honest version: for most Simcoe County houses, blown-in cellulose or fiberglass on top of what's already there is the best money. Foam earns its price in specific spots, not across a whole open attic.
How the Job Goes: Five Steps
- Inspection. Measure current depth, check for moisture or past leaks, and look at ventilation.
- Air sealing. Seal the leaks first — top plates, pot light openings, plumbing and wiring penetrations, the attic hatch. Insulation over unsealed leaks underperforms; warm air takes the holes straight through it.
- Baffles. Install baffles at the eaves so the new insulation doesn't block soffit ventilation the roof needs.
- Blowing. Add insulation to a measured, even R-60 across the whole attic.
- Verification. Confirm depth at several points and check the baffles and hatch before closing up.
What It Pays Back
Topping up an under-insulated attic typically pays for itself in 2–4 heating seasons, and the comfort difference — upstairs rooms that finally hold temperature — shows up the first cold night. After the payback, the savings just continue for as long as you own the house.
If your joists are showing, you already know the answer. Call Concepts Construction at (705) 330-2911 for a free estimate on attic insulation in Barrie and Simcoe County. We're available Monday to Friday, 8:30 AM to 4:30 PM.
