Vapor barrier installation in Cudahy CA - a crawl space floor covered wall to wall
Bare dirt or torn plastic under the house? We lay a heavy plastic ground cover that helps hold back moisture coming up from the ground.
- Licensed and insured.
- Free quotes on site.
- Expect a reply within 1 business day.
What does a vapor barrier under my house actually do?
Vapor barrier installation in Cudahy means our crew lays heavy plastic over the dirt in your crawl space, so less ground moisture rises into the space under your floors.
If you've opened the crawl space hatch and seen bare dirt or a damp patch, you're probably wondering what a vapor barrier job should include and what to settle before you book one. The price moves with the size of the crawl space, how much has to come out of it first, any leak that needs fixing, and whether the space is vented or sealed off. The schedule mostly turns on those repairs and on any permit, and the estimate lays out what we'd do first and why.
Is a vapor barrier right for your crawl space?
Bare dirt under the floor
If you can see open soil through the crawl space hatch, nothing is stopping ground moisture from rising.
Old plastic torn or missing
Ripped, bunched-up plastic with holes leaves patches of dirt open, so it's doing only part of the job.
Damp smell inside the house
A damp smell coming up through the floors can start with moisture from the dirt below.
Sealing up the crawl space
If you're planning to seal up the crawl space and close its vents, the ground cover comes first.
How we install a vapor barrier
First I find out whether your crawl space is vented, with openings in the foundation walls, or sealed off, because that decides how we finish the seams later. Our crew then runs the plastic across the dirt and up the walls, columns and footings, the concrete bases under them, so the whole surface gets covered and not just the open middle. We stop the wall plastic below the sill, the wood board sitting on top of the foundation, so a pest inspector can still see that strip of wall. We also leave the existing drainage paths alone, so water that drains away today still has somewhere to go once the cover is in.
Plastic on the ground is one piece of how a house fits together. If rooms stay drafty or hot upstairs, attic air sealing closes the gaps around lights, pipes and the hatch overhead, and retrofit insulation adds insulation to walls and floors in a house that's already built. I'll tell you which of those is worth doing for your house and which isn't.
Ground cover for a vented crawl space
Many older houses have vents in the foundation walls, and in that kind of crawl space we overlap the plastic rather than sealing every seam shut. Energy guidance calls for sealed seams only in a crawl space that isn't vented, so this finish matches how your house breathes.
Sealed seams for an unvented crawl space
If your crawl space is closed off, or you're closing it because the ductwork runs down there, we seal the seams and openings with a durable sealant made to work with the plastic. It takes more labor, so it only makes sense when the vents are actually closed.
What happens after you call about a vapor barrier in Cudahy?
Call or send us a message
Call (213) 338-1994 or use the form, and we'll get back to you to set a time for a visit. It helps to know the rough size of your crawl space and any leaks you've noticed.
I look under the house
I come out myself, check the crawl space with you, and tell you whether it's vented or sealed and what I found down there. The estimate spells out what we'd do first and why, so you know where the money goes before anything starts.
We do it in order
If you go ahead, we sort out any permit and any repairs first, then our installers lay the plastic while I check the work. When it's done, I walk the finished crawl space with you so you can see the seams, the walls and the open strip under the sill.
Vapor barrier first, insulation second?
Cover the ground first, then decide on insulation.
In an older house I'd rather get the ground covered and any leak fixed before anyone talks about insulating the floor, because insulation laid over a damp crawl space just hides the problem. With the plastic down, it's a lot easier to see what the space really needs.
Sometimes the answer is nothing more. If the floor above already has decent insulation, I'll tell you the plastic is enough and you can keep the rest of your money, and if the floor is bare, we can talk about insulating it once the ground is covered.
Insulation work, up close
Take a look through these examples of insulation work, from attics and walls to crawl spaces, to get a feel for what each job involves.
Get a vapor barrier estimate for your crawl space
Tell us the rough size of your crawl space and any leaks you know about, and we'll reply within one business day to set up a visit. I'll come look and give you a free on-site quote with no obligation.
Why Cudahy homeowners call Landmark Cudahy Spray Foam Insulation for vapor barriers
I look at every job myself
I come out to see every crawl space and give the estimate in person, and I'm back on site to check our installers' work. You talk to the person who actually saw what's under your house.
In business since 2021
That's five years of working in houses people already live in, not new framing where everything is easy to reach. Every crawl space we open turns out a little different, so we look before we assume.
Older Cudahy homes are our usual call
Most of our calls come from older houses around Cudahy, where the crawl space has usually been patched a few times. If a vapor barrier won't help your house, I'll tell you that before you spend anything.
Licensed and insured for this work
We're licensed and insured for the work we do under your house. To get started, call (213) 338-1994 or use the form on this page and I'll set up a visit.
Vapor barrier questions we hear
What does a crawl space vapor barrier do?
A crawl space vapor barrier is a plastic ground cover that helps keep moisture and soil gases such as radon from coming up out of the dirt under your house. It only does that well when it's put in well, which is why we pay as much attention to the walls and seams as to the open ground.
What happens before the plastic goes down in a crawl space?
Stored things and debris come out first so the plastic can cover the ground completely, and the crawl space gets checked for water leaks. One plastic supplier's checklist puts that leak check ahead of installation, so we schedule any repair before the cover goes in, because plastic laid over a leak just hides it.
How much does a crawl space vapor barrier cost in the Los Angeles area?
Crawl space encapsulation in the Los Angeles area usually costs about $2 to $11 per square foot. That's the going rate for full encapsulation, where the crawl space gets sealed up, not our price and not plastic on the dirt alone. Your number depends on the size of the space and what has to happen first, and the estimate I give you on site spells it out. The work is backed by our satisfaction guarantee.
How do I book a permit appointment in Cudahy?
Email buildingdepartment@cityofcudahyca.gov or call (323)-773-5143 ext. 243, because the city takes permit applications and issues permits by appointment. If you'd rather we ask for you, just say so at the estimate.
What is the best way to compare vapor barrier quotes?
Check the plastic's thickness first, since energy guidance calls for at least 6 mil, then see whether the quote covers the walls and columns or just the open dirt. Ask how the seams will be finished too, because that should match whether your crawl space is vented or sealed.
Is a vapor retarder the same thing as a vapor barrier?
Yes, builders use the two names for the same thing, so a quote or a product label might say either one. What matters more is the thickness of the plastic and how the seams and walls get finished.
Want someone to look under your house?
I'll come look at your crawl space in person and walk you through what I found and what to do first.
Other work that often goes with it
Vapor barrier installation around Cudahy
Cudahy requires a building permit before work starts on a new structure or a remodel at a business, and the city builds to the California Building Code with Los Angeles County's changes, which covers repairs and alterations to existing buildings. That doesn't settle on its own whether plastic under a house needs a permit, and rules differ between cities and County areas, so we check with the building office that covers your address. When a permit is needed, we handle the paperwork and line up the inspection, and if you want to ask yourself, the city's building and safety office is the place to start.
Most crawl spaces we open around here belong to older houses, with torn plastic from an earlier job and vents nobody has looked at in years. We run into the same setups on jobs in South Gate and Bell Gardens, and we work in plenty of nearby cities without a page here, so ask even if yours isn't listed.