Crawl space vapor barrier in Davenport IA - a ground cover that fits your crawl space
Cold floors, musty smell, bare dirt below? We cover that ground so less moisture and soil gas works up into your rooms.
- Services
- 16
- Service areas
- 12

Book a crawl space vapor barrier estimate
I go down there, measure the floor and check your vents before quoting anything.
Request an estimateWhat does a crawl space vapor barrier do?
A crawl space vapor barrier in Davenport is a sheet of heavy plastic laid over the dirt floor under your house, and it helps hold back the ground moisture and soil gases, radon among them, that would otherwise work their way up into your rooms.
Most people call us because the floors over the crawl space feel cold, the house smells damp, or they finally looked down the hatch and found bare dirt or old plastic torn to pieces. The price mostly moves with the size of the floor, how thick a liner you pick, whether a dehumidifier goes in, and whether your crawl space is vented or sealed, because that changes how the plastic gets finished. The schedule turns on how much has to come out of there first and, if your walls are insulated, on settling how the liner meets them. You get your own number when I come out and look.
How we install a crawl space vapor barrier
I start by figuring out whether your crawl space is vented or sealed and how water already moves through it, because the liner has to work with both and shouldn't change where water drains now. If your walls are insulated, we settle how the liner meets them before we start, not halfway through the job. You can clear out whatever's stored down there before we arrive so the plastic can cover the whole floor, then our crew lays the liner across the ground, finishes it the way your kind of crawl space needs, and cleans up so the only thing you notice is the new floor. If there's standing water or a leak feeding the space, I'll tell you to fix that first, because plastic over a wet problem just hides it.
Some houses need a moisture layer in the walls or ceilings too, and that's our vapor barrier installation work. Air that rises out of a crawl space usually leaks out the top of the house, so attic air sealing, closing the gaps up there before anything else goes in, is often worth a look on the same visit.
Crawl space vapor barrier work in Davenport
The City of Davenport's Building Counter issues permits, and the city's permit list names excavation, fill, plumbing and electrical work but doesn't mention crawl space vapor barriers, so that list doesn't settle it for this job. The counter is the place to ask. If your job does need a permit, we take care of it with the city and tell you about it up front.
We're based in Davenport and work on both sides of the river, and plenty of the crawl spaces we open up sit under older houses with low clearance, a tight hatch and whatever plastic someone put down years ago, bunched against the walls. We see the same thing on jobs in Bettendorf and Rock Island, and in a lot of cities that don't have their own page here.
Why call us for a vapor barrier
The owner writes your estimate
I come out myself, go down into the crawl space and write the estimate, then our crew does the work and I check the finished job with you. You deal with the person who actually looked at your house from start to finish.
Running our own crew since 2021
I learned this trade on my dad's crew around Davenport, crawling through attics before I could drive, and started this business in 2021 to run jobs the way he taught me. That means the right order and no shortcuts, even when it costs us the sale.
Licensed and insured
We're licensed and insured. Ask anyone you're comparing for the same, because this job puts a crew under your house right next to your wiring and pipes.
- Phone
- (563) 265-6737
- Hours
- Mon–Fri: 7 AM–10 PM, Sat–Sun: 8 AM–9 PM
- Location
- Davenport, IA 52801
The liner has to match how your crawl space is vented and drains before anyone rolls out plastic. Call (563) 265-6737 or send us a note, and tell us whether you see vents, whether the walls are insulated and any radon test result you have.
Get a crawl space vapor barrier estimate at your house
Send the form and we'll reply within one business day to set a time. I'll come out, go down into your crawl space and write your estimate right there. It's free, and there's no obligation to hire us.
- Phone
- (563) 265-6737
- Location
- Davenport, IA 52801
- Hours
- Mon–Fri: 7 AM–10 PM, Sat–Sun: 8 AM–9 PM
- Credentials
- Licensed and insured.
Frequently asked questions
How much does a crawl space vapor barrier cost in Davenport?
A 12-mil vapor barrier with a commercial dehumidifier in a 1,500 square foot crawl space usually runs about $4,700 to $8,700 a job in Davenport. That's the bigger version of this work, so a different size, liner or setup is a different job. Your own number comes from the estimate at your house.
Should the seams be sealed on a vapor barrier in a vented crawl space?
Sealing the seams and openings with a durable, compatible sealant is part of the job in an unvented crawl space, not a vented one. In a sealed crawl space the plastic has to run continuous and sealed, because there it's slowing air movement as well as moisture. That's why I check which kind you have before anything else.
What is the best way to put a vapor barrier in a crawl space with insulated walls?
Keep the plastic off the inside face of the wall insulation when it's fiberglass batts, blown cellulose or mineral wool, which is what the Department of Energy's guidance says. Ask anyone quoting your job how their liner meets those walls before work starts. We settle that with you during the estimate.
Does a crawl space vapor barrier stop radon, and how do I test for it?
A well-installed ground cover helps cut down soil gases like radon coming up from the dirt, but testing is its own step. The whole state of Iowa is considered high risk for radon, and the state health department says everyone should test. Scott County residents can order free radon test kits through the link the state provides.
Who can install a crawl space vapor barrier in Davenport?
A licensed contractor or, in many cases, you. Davenport generally wants building, mechanical, plumbing and electrical work done by a licensed and bonded contractor who takes out the permit for you. Owners with title to a single-family house may remodel without a contractor license, though mechanical, electrical and plumbing installations are left out of that.
How thick should a crawl space vapor barrier be?
At least 6 mil, which is the minimum the Department of Energy's weatherization guide calls for. Thicker liners are common, like the 12-mil one in the price above. Check the thickness on each quote you get against that minimum.
Other work that often goes with it
Vapor barrier installation
When moisture is getting into the walls or ceilings instead of coming up from the dirt, this is the job that deals with it.
Attic air sealing
If the upstairs still feels drafty after the crawl space is covered, closing the gaps in the attic is usually the next step.




