If your floors are cold in winter and your heating bills are high, your crawlspace is likely under-insulated. Many Ottawa homes — especially builds from the 1970s–2000s — have thin fiberglass batts between the floor joists that sag, absorb moisture, and lose their insulating value over time.
Crawlspace insulation works two ways: insulating the floor above the crawlspace (to keep the living space warm), and insulating the crawlspace walls (to turn the crawlspace into a semi-conditioned, dry buffer space). For most Ottawa homes, the wall-insulation approach — combined with a vapor barrier — performs better and costs less to run.
We use closed-cell spray foam and rigid foam board, both of which insulate and resist moisture. Spray foam also air-seals as it insulates, stopping the drafts and stack effect that pull cold air into your home. The result: warmer floors, lower bills, and a drier crawlspace.
A Local Challenge We Understand
Ottawa's -30°C winter nights make crawlspace insulation one of the highest-ROI upgrades for local homes. Older neighborhoods like Beacon Hill, Blackburn Hamlet, and Orléans have large stocks of 1980s–1990s homes with fiberglass-batt crawlspace insulation that has failed. Newer builds in Barrhaven and Kanata often have minimally insulated crawlspace walls that could perform much better with rigid foam.
What You Get
The benefits our Ottawa customers see from this service.
How It Works
A clear, step-by-step process — no surprises.
Crawlspace assessment
We inspect the existing insulation, moisture, and floor system, and recommend floor vs. wall insulation (or both).
Prep & moisture check
We address any standing water or mold and confirm the crawlspace is ready to insulate.
Insulation install
Closed-cell spray foam or rigid foam board is applied to walls and/or rim joists, and the floor above if needed.
Air-sealing & finish
All penetrations and rim joists are sealed to stop drafts, and the space is left clean and dry.
Ottawa crawlspace insulation services
Searches Ottawa homeowners use to find this service — and what we deliver.
Frequently Asked Questions
Straight answers to the questions Ottawa homeowners ask us.
Should I insulate the crawlspace floor or the walls?
For most Ottawa homes, insulating the crawlspace walls (with a vapor barrier on the floor) performs better than insulating the floor above. It turns the crawlspace into a dry, semi-conditioned buffer that protects plumbing and reduces heat loss. We recommend the best approach after inspection.
Is spray foam or fiberglass better for a crawlspace?
Spray foam — especially closed-cell — outperforms fiberglass in crawlspaces because it resists moisture, doesn't sag, and air-seals as it insulates. Fiberglass batts absorb moisture and lose R-value over time, which is why so many older Ottawa crawlspaces need re-insulation.
How much does crawlspace insulation cost in Ottawa?
Pricing depends on crawlspace size, access, and whether we're insulating walls, floor, or both. Most projects range from $2,500 to $8,000. We provide a fixed quote after a free assessment.
Will insulating my crawlspace really lower my bills?
Yes. An under-insulated crawlspace is a major source of heat loss in Ottawa homes. Proper insulation and air-sealing typically reduces heating costs measurably and pays back over a few seasons.
Can you insulate a crawlspace with a dirt floor?
Yes. For dirt-floor crawlspaces we install a vapor barrier on the floor first, then insulate the walls and rim joists. This is the standard encapsulation approach and works very well in Ottawa's climate.