Crawl space vapor barrier in Bismarck ND - a dry, sealed ground cover under your home
Damp, musty air or cold floors over the crawl space? We find where the water comes from, then seal the ground under your house.
- Licensed and fully insured.
- Free in-person estimates.
- We respond within 1 business day.
Does my crawl space need a vapor barrier?
A crawl space vapor barrier in Bismarck is heavy plastic laid over the dirt floor and sealed to the walls and piers as one continuous sheet, so water and water vapor from the ground stay out of the space under your house.
If there's bare dirt down there, a musty smell coming up through the floors, or an old sheet of plastic that's torn and bunched in the corners, the crawl space is usually where I'd start. The price mostly comes down to how big the space is, how heavy a liner fits the way you use it, how much has to be cleared out first, and whether you want the liner alone or the whole crawl space sealed and insulated. The schedule turns on whether there's water to deal with before the liner and whether the city wants a permit, and my written estimate spells out what I'd do and why so you can see where your number comes from.
Is a crawl space vapor barrier right for your house?
Bare dirt floor below
Bare ground lets moisture rise straight into the space, and a sealed liner stops it there.
Old torn plastic
A thin sheet that's ripped, shifted or never sealed at the edges lets damp air right back in.
Musty smell upstairs
Air from the crawl space drifts up into your house, so a damp smell below often shows upstairs.
Planning a sealed crawl space
If you're thinking about sealing and insulating the crawl space, the liner is the first layer of that job.
How we put in a crawl space vapor barrier
We start by clearing out whatever's been stored or left down there, because the liner has to cover the ground completely to do its job. Then I look for standing water, rot and pest damage, and you get a written list of what I found before any plastic goes down, so you know what needs fixing first. Once that's handled, we talk about how heavy a liner fits how often someone will crawl over it, then we lay it across the whole floor, run it up the walls, piers and footings, and overlap and seal the seams so it works as one sheet.
A liner covers the ground, and sometimes that's all your house needs. If your floors run cold, the next step is crawl space insulation on the walls and rim. Damp can also get into framing in other parts of the house, and our vapor barrier installation work handles those spots. And because warm air escaping through the ceiling keeps pulling cold air in from below, attic air sealing often pairs well with a crawl space job.
Standard-weight liner
This suits a crawl space nobody goes into after the job, because it keeps ground moisture out at a lower price. It doesn't stand up well to knees and elbows, so I won't suggest it where someone crawls in often.
Heavier reinforced liner
This suits a space where the furnace, water lines or storage mean someone goes in now and then, because it's much harder to tear. It costs more, and I'll tell you plainly if you don't need it.
Liner with a sealed, insulated crawl space
This suits a house with cold floors, or with pipes and ductwork running through the crawl space, because the vents get closed and the walls get insulated along with the liner. It's a bigger job, so I'll price it next to the liner alone and you can weigh the two.
What happens when you call about your crawl space?
Call or send the form
Tell us a little about the house and how you get into the crawl space, and we'll set a time for me to come out. You can call (701) 299-5007 any day from 7 AM to 11 PM.
I look it over with you
I go down, take photos and show you what I found, what should be fixed first and what can wait. Then you get a written estimate that says what we'd do and why, so the price comes with its reasons.
Problems first, then the liner
Once any permit question with the city is settled, we take care of the problems that have to come first and seal before we insulate. I'm on the job alongside our installers the whole way.
Walk through the finished work
Before we pack up, I walk you through the crawl space so you can see the seams and edges for yourself. If you'd rather stay up top, I'll show you photos instead.
Fix the water before the vapor barrier
A liner can't keep up with standing water.
In a vented crawl space, most of the moisture is bulk water, which is plain liquid water running in from a yard that slopes toward the house, missing drainage around the foundation or a sprinkler soaking the wall. A liner works best once that's handled, because plastic laid over a puddle just traps it.
So if I find standing water, I'll show you where it's coming from and tell you plainly whether it's grading, a downspout or drain work, which is often a different trade. We put the liner in after that's sorted, so you aren't paying for it twice.
Insulation work, up close
Look through these examples of insulation work, from crawl spaces and attics to walls, to get a feel for what each kind of job involves.
Get your crawl space looked at and a written estimate
Tell us how to get into your crawl space and whether you've seen standing water down there. We respond within one business day to set up my free, in-person visit, and there's no pressure to book.
Why Bismarck homeowners call Pinnacle Bismarck Spray Foam Insulation about crawl spaces
I do your estimate myself
I come down into the crawl space with you, and I'm on the job alongside our installers when the liner goes in. The person who told you what's wrong is right there checking that it got fixed.
Licensed and fully insured contractor
North Dakota requires the contractor doing the work to be licensed when a job runs over $4,000. We're licensed and fully insured, so you don't have to wonder about that on a small liner job or a full crawl space seal.
Working in Bismarck since 2023
I started this business here in 2023 and learned the hands-on side one attic and crawl space at a time. Most of our calls are about cold rooms and high heating bills, and the crawl space is one of the first places I look for the cause.
Backed by our satisfaction guarantee
I'd rather tell you your crawl space is fine than sell you a liner you don't need, and our work is backed by our satisfaction guarantee. Call (701) 299-5007 or send the form to set up a visit.
Crawl space questions we hear
How much does a crawl space vapor barrier cost in Bismarck?
The cost comes down to the size of the crawl space, the liner weight you pick and how much prep the space needs, so I don't quote a number until I've been down there. Clearing debris, dealing with water and running the liner up every pier all add work, and a sealed, insulated crawl space costs more than a liner alone. Your written estimate breaks out each part so you can decide what's worth doing now.
Do I need a vapor barrier if my crawl space has vents?
Yes, the plastic ground cover belongs in the crawl space whether it's vented or not. Vents move air, but they don't stop moisture rising out of the ground. Closing the vents and air-sealing the space also cuts the chance of humid outside air condensing on the cold wood framing above.
How thick should a crawl space vapor barrier be?
Federal guidance calls for a liner at least 6-mil thick, a mil being a thousandth of an inch, while one company's installation guide suggests a reinforced 12 to 20 mil liner if anyone will ever crawl on it, because it says 6-mil tears. Neither one is a Bismarck code rule. I ask how often someone goes down there for the furnace, pipes or storage and pick the weight from that.
Is a vapor barrier alone enough for a crawl space in a cold climate like Bismarck?
Sometimes, but not when things that can freeze live down there. In a cold climate, a crawl space built unvented, air-sealed, insulated and tied into the house's heat can keep the floors above warmer and help protect heating equipment and water pipes from freezing. If nothing like that runs through your crawl space and the floors are comfortable, a good liner is usually enough, and I'll price both so you can compare.
How do I check for radon after my crawl space is sealed?
Use a simple radon test kit once the work is done, since radon is invisible and odorless and a test is the only way to know. The EPA and the Surgeon General recommend testing every home below the third floor, and one federal checklist for sealing crawl spaces calls for giving the owner a test kit when the job is complete. If readings come back above the EPA's acceptable level, that checklist recommends a plan to lower radon, which is work for a radon specialist.
How do I get my crawl space ready for a vapor barrier?
Take out any boxes and stored items you can reach, so the liner can cover the ground completely. Make sure we can get to the access door, and tell me if you've ever seen standing water down there. Anything you can't move, we'll clear as part of the job.
Want me to take a look down there?
I'll come out, look over the crawl space with you and send a written estimate that says what we'd do and why.
Work that often goes with it
Crawl space vapor barriers in Bismarck and nearby
The City of Bismarck approves a permit application before it issues a permit, and it won't let construction start without one. Whether a crawl space liner needs a permit isn't something I'll guess at, so before we start, we check with the city's building inspection office, and when it does, we handle the application and wait for the permit to be issued before we begin.
Winters here are hard on what's under a house. Burleigh County rates weathering as severe and builds for a 4-foot frost line and a winter design temperature of 18 below, so when water lines or ductwork run through a crawl space, I bring up sealing and insulating it, not just covering the ground. We're based in Bismarck, and we see the same bare dirt and worn-out plastic on jobs across Bismarck, in Mandan and in the other cities around them.