Ground vapour barrier, wall insulation, and rim joist sealing for dry, properly insulated crawl spaces. Free on-site quotes, or call (343) 459-3623.
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What's Involved in Crawl Space Insulation
A crawl space is treated as a full assembly, not a single insulation layer.
Ground Vapour Barrier
Heavy poly sheeting laid across the exposed earth floor to stop ground moisture.
Wall & Rim Joist Insulation
Rigid foam board or batts installed against the crawl space's foundation walls. The band where the floor framing meets the foundation.
Vent and Air Sealing Review
We assess whether existing crawl space vents should stay open or be sealed as part of the scope.
Moisture Control in Ottawa Crawl Spaces
Crawl spaces sit close to the ground and often have an exposed earth floor, which means moisture is constantly evaporating upward into the space unless it is blocked. That humid air can condense against cold framing and foundation walls, the same mechanism that drives moisture problems in basements, and over time it can support mold growth and affect the floor assembly above. A properly sealed ground vapour barrier is the first line of defence, and it has to be paired with correctly placed wall and rim joist insulation rather than installed on its own.
Our Process
How We Insulate a Crawl Space
1
Crawl space inspection
We check for existing moisture, ventilation, and access before scoping the work.
2
Ground vapour barrier
Heavy poly sheeting is laid and sealed across the earth floor.
3
Wall insulation
Rigid foam board or batts are installed against the foundation walls.
4
Rim joist sealing
The rim joist band is insulated, often with spray foam for a tighter seal.
Crawl Space Insulation Pricing in Ottawa
There is no fixed per-square-foot rate for crawl space insulation, since the scope depends on crawl space size, access, existing moisture conditions, and how much of the vapour barrier and insulation needs replacing. We confirm exact pricing with a free on-site or phone assessment.
Ottawa Insulation Experts provides professional crawl space insulation throughout Ottawa, Ontario. This service is for homeowners with an unfinished crawl space, often showing signs of dampness, musty air, or cold floors in the room above. Crawl spaces need a full assembly approach: a ground vapour barrier over the earth floor, insulation at the foundation walls, and sealing at the rim joist where the floor framing meets the foundation. We assess moisture conditions and ventilation before recommending the right combination for your specific crawl space.
Crawl Space Insulation FAQs
Do I need a ground vapour barrier if my crawl space already has some insulation?
Yes, if one is not already in place. Insulation without a sealed ground vapour barrier still leaves the space exposed to moisture rising from the earth floor, which undermines the insulation over time.
Should my crawl space vents stay open or be sealed?
It depends on the crawl space design and how the rest of the assembly is insulated. We assess this during the on-site visit rather than defaulting to one approach, since sealing vents without the right insulation strategy can cause problems.
What is used to insulate the rim joist in a crawl space?
We typically use spray foam at the rim joist, since it seals irregular gaps between the floor framing and foundation better than batts can in that spot.
Can a musty smell in my crawl space be fixed with insulation alone?
A musty smell usually points to a moisture or mold issue that needs to be addressed directly, sometimes alongside mold remediation, before or as part of installing a proper vapour barrier and insulation.
How is crawl space insulation different from basement insulation?
A crawl space typically has an exposed earth floor that needs its own ground vapour barrier, while a basement usually has a poured concrete floor and taller walls finished with a framed stud wall assembly.
Ready to Seal Up Your Crawl Space?
Free on-site quotes for crawl space insulation across Ottawa.
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