Seal out moisture. Stop mold. Protect your home from the ground up.
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These problems start small. They don't stay small.
That damp, earthy smell in your home isn't coming from dirty carpet. It's coming from your crawl space. Moisture trapped under the house feeds mold — and the air carries that smell straight into your living space. Vents, the rim joist and the crawl space walls all get sealed, because leaving one of them open lets the air back in. A dehumidifier then holds the crawl space steady year round. Ductwork running through the crawl space stops sweating once the humidity drops. Sealed crawl space vents also stop pipes freezing along the exterior run.
When moisture sits on wood long enough, it softens. Floor joists weaken. The subfloor loses its grip. You feel it every time you walk across the room — the floor gives more than it should. If the structure is already damaged, crawl space repair fixes the framing before encapsulation seals it up. Rotted joists and sill plates are replaced first, since a liner locks in whatever is already down there. Structural work always comes before the crawl space is closed. Any insulation that has fallen or soaked up damp comes out of the crawl space at the same time. We leave a termite inspection strip at the top of the crawl space walls where code calls for one.
White, green, or black patches on the wood under your house mean mold has already taken hold. It spreads fast in a damp crawl space — and up to half the air on your first floor comes from below. The liner covers the soil and runs up the crawl space walls, so mold loses the damp it needs. Insulation goes on after that, and that is where the energy saving shows up. Rigid board on the crawl space walls does more for the home than batts between the joists ever did.
Foggy windows in summer. A house that always feels clammy. Your HVAC runs nonstop but the air never feels right. The source is often an open, uncontrolled crawl space pushing moisture into every room above it. A sealed crawlspace cuts that path. The home above holds steadier humidity once the vapor route is closed, and the floors stop feeling cold in winter. Cold floors above an open crawlspace are usually an air problem rather than an insulation problem. A crawlspace sealed properly never needs its vents opened again in summer.
Crawl space encapsulation turns a damp, open crawl space into a sealed, dry environment. A heavy-duty 20-mil vapor barrier covers the floor and walls. Every seam is sealed. Every pier and column is wrapped. The result is a moisture-proof envelope that stops water vapor, mold, and outside air from reaching the wood structure of your home. The barrier runs across the soil and up to the walls so no bare earth is left. Seams are overlapped and taped, and the wrap is run around each pier. The access door is sealed and insulated too, since it is the largest single opening into most crawl spaces. Piers are wrapped individually so the crawl space liner stays continuous.
But the barrier alone isn't enough. A sealed crawl space needs active moisture control to stay dry year-round. The dehumidifier is sized to the cubic footage of the crawl space, not guessed at. Undersized units run constantly and still lose the room. A drain line or a condensate pump keeps you out of the crawl space entirely.
A commercial-grade dehumidifier keeps humidity below 55% inside the sealed space. It runs automatically and drains on its own — no buckets to empty, no settings to manage. Without it, moisture has nowhere to go once the space is sealed. Drainage systems take the water out before the liner goes down. A sump discharge is routed well away from the foundation so it cannot return. We photograph the crawl space after the liner is down so you have a record of it.
Open vents pull in hot, humid air in summer and freezing air in winter. Both cause condensation on every surface inside the crawl space. Sealing the vents permanently stops this cycle and lets the encapsulation system do its job. Wall insulation holds the crawl space nearer the temperature of the home above. A tighter crawl space also means the basement and the rooms overhead hold heat better. The energy side comes from the crawl space no longer pulling outside air through the home.
When water actively enters the crawl space, drainage comes first. A perimeter drain system collects water and routes it to a sump pump that removes it before it reaches the sealed barrier. Encapsulation without drainage is like sealing water inside a bag. Vapor barriers alone do not move standing damp anywhere. The method used has to match what the crawl space is actually doing, which is what the inspection settles. Standing damp in a crawl space needs a pump, not a thicker liner.
Our Process
We go into the crawl space, check moisture levels, inspect the joists and subfloor, and document everything with photos. You see exactly what we see — and we explain what it means in plain language. You get a written estimate before anything starts. We photograph the crawl space so you see the same conditions we did, including the parts you cannot reach.
If water is getting in, we fix that first. Perimeter drains and a sump pump go in before anything else. You can't seal a crawl space that's still taking on water. That order matters, because a liner laid over standing water hides the damage rather than stopping it. Crawl space encapsulation is the last step of the job, not the first.
A reinforced 20-mil liner covers the entire floor and extends up the walls. Every seam is taped. Every pier is wrapped. Every edge is sealed to the foundation wall. No gaps. No shortcuts. The liner is mechanically fastened at the foundation and sealed at every pipe and vent penetration. Crews completely cover the dirt, corners included.
A commercial-grade dehumidifier is installed and set to maintain safe humidity levels automatically. We verify the readings before we leave — and check again during a follow-up visit to make sure the system is performing. We come back to read the humidity and confirm the crawl space is holding. A system installed properly needs very little attention after that. Humidity in a sealed crawl space should sit in the fifties, and we show you the reading. A sump alarm is worth adding if the crawl space has ever flooded.
We don't send a salesperson to your house. The person who inspects your crawl space understands the work because they've done the work. You get straight answers about what's happening under your home, what needs to be fixed, and what it costs — before you commit to anything. Crawl space encapsulation usually costs less than repeatedly repairing a home that keeps taking on damp. Financing is available if you want to spread it. A crawl space job of this size normally runs two to four days on site.
Every encapsulation we install uses a 20-mil reinforced vapor barrier — not the thin 6-mil sheeting that tears within a year. Our dehumidifiers are commercial-grade units sized for crawl spaces, not household machines from the hardware store. The materials matter because they determine whether the job lasts or fails. Air sealing at the rim joist matters as much as the liner itself. Skip it and the crawl space stays connected to outside air no matter how good the liner is. Sealing the crawl space vents is part of the same day's work. Vent covers alone do not seal a crawl space. The liner has to tie into them.
We tell you what you need. We also tell you what you don't. If your crawl space has a minor issue that doesn't require full encapsulation, we'll say so. No pressure. No upselling. Get your quotes, compare the details, and choose the company that earns your trust — we're confident in what we deliver. Most of the time a home sees steadier temperatures once the crawl space is sealed, and the energy bill follows. We will not put a number on that before we have seen the space. Storage is fine in a sealed crawl space, which it never was before.
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A vapor barrier is a sheet of plastic on the crawl space floor. Full encapsulation goes further — the barrier covers the floor and walls, every seam is sealed, the vents are permanently closed, and a dehumidifier controls humidity. A vapor barrier slows moisture. Encapsulation stops it. A vapor barrier laid loose over soil slows the transfer. Encapsulation completely seals the crawl space, liner taped to the walls and the vents closed.
A properly installed encapsulation system lasts 20 years or more. The 20-mil vapor barrier is built to resist tears and wear. The dehumidifier typically lasts 8-12 years before needing replacement. Maintenance is minimal — check the dehumidifier filter once or twice a year and inspect the barrier annually. Look for tears where tools or storage have dragged across the liner. A crawlspace that stays sealed needs almost nothing else. Most crawl space liners last decades if nothing drags across them.
Yes. Mold needs moisture to grow. Encapsulation removes the moisture source by sealing the crawl space from ground vapor and outside air, then actively controlling humidity with a dehumidifier. Without moisture, mold cannot survive or spread. A dehumidifier sized to the crawl space holds humidity below the level mold needs. Existing growth is treated before the barrier goes in, not sealed under it. Humidity above sixty percent is where growth restarts, so the dehumidifier is the part that has to keep working.
Yes. Sealing the crawl space without a dehumidifier traps moisture inside with no way out. A commercial-grade dehumidifier keeps humidity below 55% — the level where mold, wood rot, and pest problems stop. It runs automatically and drains on its own. The exhaust routes outside so nothing recirculates into the crawl space. Basement systems work on the same principle. The dehumidifier drains to the sump or outside so nothing pools in the crawl space. Nothing in the crawl space needs power beyond the dehumidifier and the pump.
It does. A sealed, dry crawl space is a selling point during inspections. Buyers and inspectors look for moisture damage, mold, and structural issues — an encapsulated crawl space shows the home has been protected. It also avoids the price reductions that moisture problems cause during negotiations. A sealed crawlspace is easier to sell. Buyers and inspectors notice clean insulation and an intact liner in the crawl space right away. Home inspectors look at the crawl space first in this region.
Bros Basement Waterproofing provides crawl space encapsulation across all of our service areas. Each system is designed for local soil and climate conditions to deliver lasting moisture protection. Schedule your free crawl space inspection to find out exactly what your home needs. A crawlspace in this region needs attention more often than most, because the humidity stays high for much of the year. Ask about the energy side when you book.