Heavy-duty vapor barrier
A thick, durable liner covers the floor and up the walls of the crawl space, sealing out the moisture rising from the soil.
Bay Area Crawl Space Encapsulation · SPCB-Licensed · 13+ Years
Crawl Space Encapsulation in the San Francisco Bay Area
Encapsulation seals your entire crawl space — floor and walls — behind a heavy-duty moisture barrier, then closes the vents and controls the humidity. The result: a clean, dry space that stops feeding mold, pests, and rot.
Free inspectionSPCB-licensedFull moisture control13+ years experience
Free on-site estimate · No pressure · We come to you
Why It Matters
Seal the Whole Crawl Space,
Not Just the Ground
A damp crawl space is a slow leak on your whole home — the moisture rising from bare soil feeds mold and wood rot, draws in pests, and pushes humid, musty air up into your living space. Encapsulation is the complete fix: we line the entire crawl space, floor and walls, with a heavy-duty vapor barrier, seal the vents and access, and control the humidity so the space stays dry for good.
That's what sets it apart from a standalone vapor barrier, which just covers the ground to slow moisture — a lighter, partial measure. Encapsulation goes further and turns the crawl space into a sealed, conditioned zone. It pairs naturally with fresh crawl space insulation once the space is dry.
- A clean, dry, sealed crawl space
- Moisture and humidity brought under control
- Stops mold, wood rot, and musty air
- Makes the space far less inviting to pests
- Healthier air rising into your home
- Better energy efficiency and comfort
What's Included
What Crawl Space
Encapsulation Includes
Encapsulation is a complete system, not a single product. Here's what a full treatment covers.
Sealed vents & access
We seal the crawl-space vents and access points so humid outside air and pests can't get back in and undo the work.
Sealed seams & piers
We tape and seal the seams and wrap around piers and posts, so the barrier is continuous and truly sealed — not just laid down.
Insulation
With the space sealed and dry, we can add or upgrade insulation so it actually performs instead of soaking up moisture.
Dehumidifier (when needed)
For spaces that hold humidity, a crawl-space dehumidifier keeps the sealed area dry year-round.
Drainage (when needed)
If water gets in, we address it first — a french drain or sump pump — so encapsulation seals a space that's already dry.
Do You Need It?
Signs Your Crawl Space
Needs Encapsulation
A crawl space that stays damp will keep causing problems until it's sealed. If these sound familiar, it's a candidate.
Persistent moisture or humidity
Damp surfaces, condensation, or a crawl space that never dries out is the core problem encapsulation is built to solve.
Mold or wood rot
Mold on framing or soft, rotting wood under the house means moisture has taken hold — sealing the space stops the source.
Musty air in the house
A musty smell rising into your living space usually starts as damp, contaminated air in the crawl space below.
Sagging or wet insulation
Insulation drooping or soaked under the house is a sign of a moisture problem an encapsulation fixes at the root.
Pests getting in
Open vents and a damp floor make a crawl space inviting to rodents and insects — sealing it up shuts that door.
High energy bills & cold floors
A vented, damp crawl space drags down efficiency and leaves floors cold; a sealed, insulated one helps both.
How We Work
Our Crawl Space Encapsulation Process
A sealed space only stays dry if it's clean and the water is handled first. Here's how we approach every encapsulation.
Free inspection
We inspect the crawl space for moisture, water intrusion, mold, and pests, and confirm what it takes to seal it properly.
Clean & prep
We clear out debris and any contaminated or fallen insulation, and address standing water or leaks before anything gets sealed.
Install the vapor barrier
We line the floor and walls with a heavy-duty vapor barrier, sealing the seams and wrapping the piers for a continuous barrier.
Seal & insulate
We seal the vents and access, add insulation, and fit a dehumidifier where the space needs help staying dry.
Verify & walkthrough
We confirm the space is sealed and dry, clean up, and walk you through the finished crawl space and how to keep it that way.
Free inspectionSPCB-licensedSealed & moisture-controlled
Why Attic Pros
The Bay Area's Trusted
Crawl Space Team
For over 13 years, Bay Area homeowners and businesses have trusted us to dry out and seal their crawl spaces — because we handle the moisture at its source, seal the space properly, and stand behind our work.
- SPCB-licensed (Co. Reg. #9901) & CSLB Lic. #1022608
- Diamond Certified & Angi Super Service Award winner
- Independently reviewed — verified Google ratings
- Complete system — sealed, insulated, moisture-controlled
- Free, no-obligation crawl space inspection
- Local team with 13+ years under Bay Area homes
Real Customers, Real Results
Trusted by Bay Area Homeowners
4.8
★★★★★
Based on 1,900+ verified Google reviews — trusted for crawl space encapsulation & home services across the Bay Area
Google Review
★★★★★
Tom is a professional and did a very detailed inspection, also gave additional details to prevent in future infestation.
ajit rathi
Google Review
★★★★★
My wife and I found mice droppings in our kitchen cabinet. We reached out to Attic Pros and was connected with Tom. He was very professional and thorough with his inspection. We went through our crawl space and attic. Gave us a full rundown of issues/problems we may be experiencing now and potentially in the future. Thanks for your expertise and quick follow up with the quote and service Tom.
Will Le
Google Review
★★★★★
These guys are awesome. Super clear comms to schedule, then received an extremely thorough consultation. We eventually decided to go with them as other shops in the area didn't communicate as well as Attic Pros.
Pedro Kroeff
Google Review
★★★★★
Tom from Attic Pros was great to work with! He was friendly, professional, and thorough during the inspection. He clearly explained everything he found and answered all of my questions. The whole process was straightforward. Thank you, Tom!
Daria Baevski
Google Review
★★★★★
Finding out we had a rodent infestation for the first time was incredibly stressful, but Attic Pros made the entire process so much easier! Jeremy was very knowledgeable when help preparing the estimate and the work that needed to be done. Their team that came to perform the work—Nico Otten, Juan Rodriguez, and Antonio Lopez—were amazing from start to finish. Communication was fantastic right from the beginning. The crew was super fast, highly efficient, and left everything very clean after sanitizing our attic, crawl space, and garage. They definitely gave us total peace of mind. They were also able to finish in one day!!
Annie M
Google Review
★★★★★
Our small cottage has a very narrow attic entrance. Denis from Attic Pros was willing to try and was able to enter to clean, vacuum, and replace the old insulation. Very professional, access areas were well shielded and protected. Powerful vacuum and clean up well after themselves.
Morgan Yang
QUESTIONS, ANSWERED
Frequently Asked Questions
Straight answers to the questions people actually ask about crawl space encapsulation — what it is, how it differs from a vapor barrier, and whether you need a dehumidifier. Still unsure? Our team is happy to help.
Still have questions?
Talk to our team — we're here to help.
(800) 543-0382It's a complete sealing of your crawl space: a heavy-duty vapor barrier lines the floor and walls, the vents and access are sealed, and the humidity is controlled — often with a dehumidifier. The result is a clean, dry, sealed space that no longer feeds mold, rot, or pests, instead of a damp, vented one open to the ground and the weather.
A standalone vapor barrier just covers the ground to slow moisture rising from the soil — a lighter, partial step. Encapsulation is the full treatment: it lines the floor and the walls, seals the vents and access, and controls the humidity, turning the whole crawl space into a sealed, conditioned zone. If you only need the ground covered, our vapor barrier page is the lighter option.
Not always — it depends on how much moisture your crawl space holds. Sealing the space and lining it removes most of the moisture source, and for many homes that's enough. For spaces that still hold humidity, a crawl-space dehumidifier keeps the sealed area reliably dry. We'll tell you which your home needs at the inspection.
It can. A vented, damp crawl space lets outside air and moisture affect your floors and your HVAC's efficiency. Sealing and insulating the space helps stabilize the temperature under your home and can make it more comfortable and efficient. Actual savings depend on your home and how it was before.
It addresses the conditions they need. Mold needs moisture, and pests are drawn to damp, open crawl spaces — so removing the moisture and sealing the vents and access makes the space far less hospitable to both. If mold or pests are already present, we handle that first as part of the prep.
Often, yes. Insulation that's fallen, wet, or rodent-contaminated has to come out before the space is sealed, or you'd be sealing the problem in. We handle crawl space insulation removal as part of the prep, then add fresh insulation once the space is dry and sealed.
It depends on the size of the crawl space and how much cleanup, moisture work, and insulation is involved. Many homes are completed in a visit or two. We'll give you a clear timeline after the free inspection.
Very little. Once it's sealed, the occasional check that the barrier is intact and the dehumidifier (if you have one) is running is about all it needs. A sealed crawl space is far lower-maintenance than a damp, vented one.
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Crawl Space Encapsulation Across the Bay Area
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Ready when you are
Book Your Free Crawl Space Inspection
Tell us what's going on under your home — moisture, musty air, pests — and we'll inspect it, assess the humidity, and lay out a clear encapsulation plan with no pressure.