Crawl Space Encapsulation — A Clean, Dry, Sealed Space Under Your Home
Crawl space encapsulation turns a damp, dirt-floored crawl space into a sealed, dry part of the house. We cover the ground and walls with a heavy vapour barrier, tape and seal every seam, close the vents, insulate the walls and rim joists and control humidity — with drainage and a sump where water gets in.
Crawl spaces are common under older Toronto additions, sunrooms, bungalows and many cottages around Barrie and Orillia. Left open, they bring damp air, musty smells, cold floors and mould into the house above.
Need crawl space waterproofing near me or crawl space encapsulation contractors in Toronto? Our crew handles the whole job — from cleanup and repairs to the final sealed space.
What a Fully Encapsulated Crawl Space Looks Like
Signs Your Crawl Space Needs Attention
Musty smell in the house
Air from the crawl space rises into the living space above it.
Cold or soft floors
Damp, uninsulated crawl spaces make floors cold and can rot subfloors and joists.
Mould or wet insulation
Fibreglass that sags, drips or has dark spots has been soaking up moisture.
Standing water or wet soil
Water entering from walls or the ground needs drainage, not just a liner.
Condensation on pipes and ducts
Humid air condensing on cold surfaces drips onto everything below.
Pests and rodents
Damp, open crawl spaces attract mice, insects and wood-damaging pests.
Crawl Space Encapsulation, Layer by Layer
Ground & walls
A continuous liner stops ground moisture and soil gases from entering the space.
- Debris, old insulation and wet materials removed
- Heavy reinforced vapour barrier over the soil
- Liner run up the walls and mechanically fastened
- All seams overlapped and taped
- Piers and penetrations wrapped and sealed
Insulation & air sealing
A sealed, insulated crawl space keeps floors warmer and stops humid outside air coming in.
- Vents sealed with insulated covers
- Rim joists insulated and air sealed
- Foundation walls insulated
- Access door insulated and gasketed
- Gaps to the house above sealed
Water & humidity
Where water gets in, drainage goes under the liner; humidity is then kept under control.
- Perimeter drain where water enters
- Sump pit and pump to remove water
- Wall cracks sealed before lining
- Dehumidifier sized for the space
- Humidity checked after installation
Vented Crawl Space vs Encapsulated Crawl Space
| Vented / open crawl space | Encapsulated crawl space | |
|---|---|---|
| Ground | Bare soil or thin plastic | Heavy liner, sealed seams |
| Vents | Open to outside air | Sealed |
| Summer humidity | Humid air enters and condenses | Controlled by dehumidifier |
| Floors above | Cold in winter | Warmer, fewer drafts |
| Air quality | Musty air rises into the house | Clean, dry air |
| Soil gas | Enters freely | Liner reduces entry |
Radon is a natural soil gas; Health Canada’s guideline is 200 Bq/m³. A sealed liner reduces soil gas entry, but only a radon test tells you your level — we recommend testing before and after.
Our Crawl Space Encapsulation Process
Inspection
Moisture, water entry, insulation, mould, structure and access.
Written plan
Liner type, insulation, drainage and humidity control — with prices.
Clean out
Debris, old insulation and wet materials removed; soil graded.
Repairs & drainage
Cracks sealed; perimeter drain and sump installed if water gets in.
Liner & sealing
Vapour barrier on floor and walls, seams taped, vents and gaps sealed.
Insulation
Walls and rim joists insulated; access door insulated.
Humidity control
Dehumidifier set up and the space checked after installation.
Crawl Space Encapsulation Cost in Toronto
Price depends on the size of the space, how much needs to be removed and whether water must be drained.
| Scope | Typical price | Good for |
|---|---|---|
| Basic vapour barrier (floor only) | $2,000 – $4,500 | Dry spaces with mild ground moisture |
| Standard encapsulation | $5,000 – $10,000 | Spaces with noticeable humidity |
| Full encapsulation (floor, walls, sealing) | $8,000 – $15,000 | Damp spaces, musty odours, cold floors |
| Encapsulation + dehumidifier | $10,000 – $18,000 | High seasonal humidity |
| Crawl space + drainage system | $12,000 – $22,000 | Water entry or standing water |
Approximate 2026 Toronto prices, not a quote. Full list: waterproofing prices.
Inside the Crawl Space or Outside the Foundation?
Encapsulation (inside) fixes…
- Ground moisture and humidity
- Musty air and cold floors
- Condensation and wet insulation
- Soil gas entry through bare soil
Foundation work (outside) fixes…
- Water pushing through the walls
- Cracked or failing foundation walls
- Missing footing drainage
- New crawl space foundations
For the outside of the walls see foundation waterproofing; for basements see wet basement repair.
Related Services
Why Crawl Space Air Ends Up in Your Home
The stack effect
Warm air rises out of the top of the house and pulls air up from below — including from the crawl space.
Moisture from the ground
Bare soil gives off water vapour all year, raising humidity under the floor.
Mould and odours
Damp wood and insulation grow mould, and the smell rises into living space.
Cold floors
Wet insulation and open vents make floors above a crawl space cold in winter.
Vented Crawl Space vs Encapsulated Crawl Space
| Vented (traditional) | Encapsulated | |
|---|---|---|
| Ground | Bare soil or thin plastic | Sealed heavy liner |
| Vents | Open to outside air | Sealed |
| Humidity | Follows the weather — high in summer | Controlled, usually with a dehumidifier |
| Insulation | Between floor joists, often falling down | On the walls |
| Pests | Easy entry | Openings sealed |
| Floors above | Cold in winter | Warmer and drier |
Crawl Space Repair and Renovation
Encapsulation works best on a crawl space that is in good shape. These are the repairs we often do first.
Water and drainage
Stop water before sealing the space.
- Wall leaks repaired
- Interior drain and sump
- Grading outside
Wood and structure
Damaged framing is repaired.
- Rotted joists or sills
- Sagging floors supported
- Posts and beams checked
Clean-out
Old debris and wet insulation removed.
- Fallen insulation
- Old plastic
- Pest debris
Access
Easier, sealed access for service.
- Insulated access door
- Path for future service
- Lighting if needed
Signs Your Crawl Space Needs Work
Musty smell upstairs
Especially in summer or after rain.
Standing water or wet soil
Water under the house after storms.
Sagging or bouncy floors
Often from damp, weakened joists.
High humidity
Condensation on windows and ductwork.
Pests
Mice, insects or animals getting in.
Cold floors
Above a crawl space with open vents.
Crawl Space Encapsulation Questions
What is crawl space encapsulation?
It is sealing a crawl space with a heavy vapour barrier on the ground and walls, taped seams, sealed vents, insulation and humidity control, so the space stays dry and clean.
How much does crawl space encapsulation cost in Toronto?
Typically $2,000–$4,500 for a basic floor vapour barrier, $8,000–$15,000 for full encapsulation and $12,000–$22,000 when a drainage system is needed.
Is crawl space waterproofing the same as encapsulation?
Not quite. Waterproofing deals with liquid water — drainage, sump, sealing walls. Encapsulation seals the space against moisture and air. Many crawl spaces need both.
Do I need a dehumidifier in an encapsulated crawl space?
Often yes, especially in humid Ontario summers. We size it to the space and check humidity after installation.
Should crawl space vents be sealed?
In an encapsulated crawl space, yes. Open vents bring in humid summer air that condenses on cool surfaces.
Will encapsulation stop the musty smell?
In most homes, yes — once moisture is controlled and wet materials are removed.
Does encapsulation help with radon?
A sealed liner reduces soil gas entry, but only a radon test shows your level. Health Canada’s guideline is 200 Bq/m³.
How long does it take?
Most crawl spaces take a few days, depending on size, cleanup and whether drainage is needed. The schedule is in your quote.
Is there a warranty?
Yes, a written warranty on materials and workmanship.
Can encapsulation be done in a basement and crawl space together?
Yes. Many Toronto homes have a basement with a crawl space under an addition, and basement and crawl space waterproofing can be done as one project.
Do I need to fix leaks before encapsulation?
Yes. A liner hides water but does not stop it. Leaks and drainage problems are fixed first, then the space is sealed.
Does crawl space encapsulation lower energy bills?
It often helps, because the floor above stays warmer and ducts in the crawl space lose less heat.
Get a Crawl Space Quote
We will inspect the crawl space, check for water and humidity and give you a written plan with prices.
Call now — Mon–Fri 7 AM – 4 PM(416) 992-5858Office: 58 Six Point Rd, Etobicoke, ON M8Z 2X2
Email: info@leaquida.ca
Licence No.: P94 4418977 (licensed contractor)