An unsealed crawlspace is one of the biggest hidden problems in an Ottawa home. Up to 50% of the air you breathe on the first floor originates in your crawlspace — so when that space is damp and moldy, your living space is too. Encapsulation seals the crawlspace floor and walls with a heavy-duty vapor barrier, seals the vents, and adds conditioned air and a dehumidifier to keep it dry year-round.
Ottawa's climate is hard on crawlspaces: humid summers push moisture in, and cold winters drive stack effect — pulling crawlspace air up through the floor into your living space. The result is musty odors, cold floors, higher energy bills, and in many cases mold and wood rot in the floor system.
A properly encapsulated crawlspace becomes clean, dry, and usable. It improves indoor air quality, reduces energy costs, and protects your home's structure. We use commercial-grade CleanSpace-style vapor barriers and sealed vent covers designed for the Ottawa Valley's freeze-thaw cycle.
A Local Challenge We Understand
Ottawa's humid continental climate — with humid summers and deep-freeze winters — makes crawlspace moisture a widespread problem. Older homes in the Glebe, Old Ottawa South, and Vanier often have vented crawlspaces that were never designed to stay dry. Newer homes in Barrhaven and Orléans can still develop moisture issues when downspouts, grading, or foundation drains underperform. Encapsulation is the permanent fix.
What You Get
The benefits our Ottawa customers see from this service.
How It Works
A clear, step-by-step process — no surprises.
Inspection & cleanup
We assess moisture sources, remove debris, address any existing mold, and fix grading or drainage issues before sealing.
Seal vents & air leaks
Vents are sealed with insulated covers and rim joists are air-sealed to stop humid outside air from entering.
Vapor barrier installation
A heavy-duty vapor barrier is laid across the floor and fastened up the walls, with all seams sealed and piers wrapped.
Conditioning & dehumidifier
We add a dehumidifier (and conditioned air if needed) to keep humidity below 50% year-round.
Ottawa crawlspace services we provide
Searches Ottawa homeowners use to find this service — and what we deliver.
Frequently Asked Questions
Straight answers to the questions Ottawa homeowners ask us.
How much does crawlspace encapsulation cost in Ottawa?
Encapsulation in the Ottawa area typically ranges from $5,000 to $12,000 depending on crawlspace size, condition, whether a dehumidifier is needed, and how much insulation and mold remediation is required. We provide a detailed fixed quote after inspection.
Should I seal my crawlspace vents?
Yes. Modern building science has moved away from vented crawlspaces — vents let in humid summer air that condenses on cool surfaces and causes mold. Sealing vents and conditioning the space keeps it dry.
Will encapsulation help with the musty smell in my house?
In almost every case, yes. The musty smell is crawlspace air being pulled into your living space by stack effect. Encapsulation removes the source of the moisture and the odor.
Does encapsulation help with radon?
Yes. Sealing the crawlspace floor and walls reduces radon entry points. For homes with elevated radon, we can combine encapsulation with a radon mitigation system for full protection.
How long does encapsulation last?
A professionally installed system with a quality vapor barrier and dehumidifier lasts 15–20+ years with minimal maintenance — mostly annual dehumidifier filter cleaning.