Attic Spray Foam Insulation

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Attic Spray Foam Insulation in

GRIMSBY, ONTARIO

Your attic is one of the biggest places a home loses heat. Warm air rises, and when the attic floor or roof deck isn't sealed and insulated well, that heat slips right out the top of the house. During a cold Grimsby winter, your furnace works overtime to keep up — and you feel it on every energy bill.

A spray foam installer applying spray foam insulation into the rafters of an attic

Why Is Attic Insulation Such A Big Deal?

Spray foam seals air leaks and adds insulation in one step. We spray it across the attic floor between the joists, or right onto the underside of the roof deck — it depends on how your attic is set up. Either way, you lose less heat and your home stays more comfortable all year.

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What Kind Of Attic Do You Have?

Attics aren't all built the same way, so the right approach depends on yours.


Vented attics are common in older Grimsby homes. Here the insulation sits on the attic floor instead of the roof deck. We spray foam between and over the floor joists. That gives the rooms below a sealed, well-insulated ceiling while the soffit and ridge vents keep air moving through the attic.


Unvented or sealed attics show up more in newer homes and renovations. For these, we spray foam right onto the underside of the roof sheathing. That turns the attic into a semi-conditioned space, which helps your ductwork run better and cuts down on ice dams in winter.

Attic insulation doesn't last forever. Fiberglass batts can shift, flatten, and soak up moisture over time. Blown-in cellulose settles and leaves thin spots. Some older homes also have vermiculite, which can be a concern.

Keep an eye out for these signs:

  • Heating or cooling bills that keep climbing
  • Rooms that feel warmer or colder than others
  • Ice dams building up along the edge of the roof in winter
  • Drafts near ceiling lights or the top of walls
  • Moisture stains or frost showing up in the attic

Yes. In many cases, existing insulation should be removed before spray foam is applied, particularly if it is damaged, mould-affected, or heavily contaminated by pest activity. Our team can advise on whether removal is necessary based on what we find during the assessment.


Some renovation projects choose to add spray foam on top of existing blown-in insulation to boost the R-value and improve air sealing. The right approach depends on the condition of what is already there and the goals of the project.


Ice dams are a headache for plenty of Grimsby homeowners. They start when heat leaking through a poorly insulated roof melts snow near the peak. That water runs down and refreezes at the cold roof edge. The ice then backs up under the shingles and pushes water into the house.


A solid spray foam job cuts down the temperature gap that causes ice dams. With the attic floor or roof deck sealed up, far less heat escapes through the roof. Fewer ice dams means less water damage and fewer rushed repairs late in the winter.

What R-Value Do Attics In Grimsby Need?

Ontario's building code and our climate zone call for high attic R-values — usually somewhere in the R-50 to R-60 range for the ceiling or floor here. Spray foam packs more R-value per inch than most other materials, with closed cell foam landing around R-6 to R-7 per inch.

On attic floors, we often pair spray foam for air sealing with blown-in insulation to hit the target R-value without overspending. On the roof deck in a sealed attic, we calculate how thick the foam needs to be to meet code.


How Long Does Attic Spray Foam Last?

Spray foam in an attic — on the floor joists or the roof deck — is built to last as long as the house does. It won't sag, settle, or soak up water. Once it's cured and covered, it keeps working at full strength for decades with no upkeep. That's a big reason Grimsby homeowners pick it when they don't want to redo the job every ten years.

Ready To Fix Your Attic Insulation?

Attic insulation is one of the best upgrades a Grimsby homeowner can make. When your attic falls behind, the whole house feels it through every season. We'll look at your space and suggest the right plan for how your home is built, the comfort you want, and the budget you're working with. Contact Grimsby Spray Foam Insulation to book a free estimate.