Crawl space vapor barrier in Vacaville CA - ground moisture kept under the plastic
Cold floors, a musty smell or damp bare dirt under the house? We lay plastic over the crawl space floor so less ground moisture rises toward you.
Do I need a vapor barrier in my Vacaville crawl space?
A crawl space vapor barrier, sometimes called a vapor retarder, is a plastic ground cover laid over the dirt under your house. In a Vacaville home with a raised floor, a well-installed one helps keep ground moisture and soil gases like radon from rising into the crawl space.
Most calls start with cold floors, a musty smell or a look through the hatch at bare dirt. We're J&S Vacaville Insulation Services. We've been in business since 2017, and we're based in Vacaville and work in the cities around it. If you're also thinking about crawl space insulation, I'll look at both on the same visit.
The price turns on how big your crawl space is, how hard it is to move around in, how many piers and walls the plastic has to wrap and how much has to come out first. Water sets the schedule, because if it's pooling down there, the source gets fixed before the cover goes in. I look at the space in person and send you a written estimate that says what I'd do first. We're licensed and insured, and if your job needs a permit, we apply for it and set up the inspection.
- Plastic covers the whole dirt floor and runs up the foundation walls, piers and footings.
- It belongs in vented and sealed crawl spaces alike, so open foundation vents don't rule it out.
- Plastic won't stop liquid water, so pooling or running water gets fixed at its source first.
What happens after you call about your crawl space?
I look at every crawl space myself before you get a price, and our installers do the work after that. Here's how it goes from the first call to the final look.
Call or send the form
Call (707) 452-3285 or use the form on this page, and we'll set a time for me to come out. It helps to know whether your crawl space has open vents and what you've got stored down there.
I go under the house
I check the dirt, the walls, the piers and any sign of water, and before I leave I tell you what I'd do first and why. You get the estimate in writing, and if a drainage fix outside matters more than plastic right now, I'll say so, because I'd rather lose the sale than sell you work your house doesn't need.
Our installers lay the cover
Our crew clears the crawl space and puts the cover in the way we planned at the estimate. Leave us a clear path to the crawl space hatch and keep pets away from it while we work.
We look it over together
Before we call the job done, I check the work and go over it with you. Our work is satisfaction guaranteed.
Crawl space ground cover, from bare dirt to covered
These photos show the kind of crawl space work this page covers, from bare dirt floors to plastic lapped up walls and piers. They're examples of the trade, not pictures of a particular house.
A worker in protective coveralls sprays loose white insulation through a hose across an attic floor beneath exposed rafters.
An unfinished room has pale spray foam insulation between exposed wooden studs and across the ceiling.
A kneeling worker sprays pink blown-in insulation through a hose across an unfinished attic floor.
Exposed attic rafters and walls are coated with pale foam insulation, with ducts and framing visible.
A worker in protective coveralls vacuums loose attic insulation through a hose among exposed wooden rafters.
Spray foam insulation covers the underside of a crawl space floor around a large metal duct and exposed wood joists.
Get a written estimate for your crawl space vapor barrier
Send the form and we'll reply within one business day to set up a free on-site estimate, with no obligation. I'll come out, get under your house and tell you what I'd do first, then send it in writing.
(707) 452-3285Crawl space vapor barrier questions from Vacaville homeowners
These are the things people ask us about crawl space vapor barriers before they book a visit. If your question isn't here, call (707) 452-3285 and I'll answer it.
How much does a crawl space vapor barrier cost in Vacaville?
Your price comes from your own crawl space, so I give you a written number after I've been under the house rather than a guess over the phone. A sealed crawl space costs more than a vented one because every seam and pipe gets sealed, and a runner over a walk path adds a little. Clearing out your stored things before we come keeps the cost down.
Do I need a vapor barrier if my crawl space has vents?
Yes. Building America guidance says the plastic ground cover should go in whether the crawl space is vented or unvented. Open vents don't stop moisture coming up out of the dirt, so a vented crawl space is still a good fit for a cover.
Will a vapor barrier fix a wet crawl space?
Not if the wet is actual water. In a vented crawl space the main moisture source is usually liquid water from a yard that slopes toward the house, missing drainage around the foundation or sprinklers soaking along the walls. That's why I look at your grading, drainage and watering habits along with the cover, and the water gets fixed first.
Does a vapor barrier help with radon?
A well-installed cover helps keep soil gases like radon from coming up out of the dirt, but it can't tell you your level. The only way to know your home's radon level is to test the air. The EPA recommends against long-term exposure above 4 picocuries per liter.
How do I get my crawl space ready for a vapor barrier?
Clear out what you've stored down there, because boxes, old lumber and debris have to come out so the plastic can cover the whole floor. When I come out for the estimate, I'll point out anything else that needs to move.
How long does a crawl space vapor barrier install take?
The size of your crawl space, how tight it is to work in and how much has to be cleared out first set the timing. Any water problem has to be fixed before we start, so that can add time. I'll tell you what to expect after I've been under your house.
Crawl space vapor barrier in Vacaville and nearby cities
The City of Vacaville's express permit list names attic insulation and HVAC, not vapor barriers, so I'll tell you at the estimate how permits work for yours. We do the same crawl space work in the cities below.