Crawl space vapor barrier in State College PA - a drier space under your house
Musty smell, damp dirt or torn old plastic under the house? We deal with any water first, then cover the ground properly.
- Licensed and insured.
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Does my crawl space need a vapor barrier?
A crawl space vapor barrier in State College is a plastic sheet laid over the crawl space ground, and a well-installed one helps keep ground moisture and soil gases from rising into the space under your house.
Most people call us about a musty smell coming up through the floor, cold floors in winter, or old plastic down there that's torn or bunched up and leaves bare dirt showing. The price mostly follows the size of the floor, whether water or mold has to be fixed first, how much is stored down there and whether the space is vented, because that decides if the seams need sealing. The schedule turns on the same things, plus any drying time and a permit where one applies, and I'll give you your own figure in a written estimate once I've seen the space.
How we put in a crawl space vapor barrier
I start by looking the crawl space over, because if there's standing water or mold, that gets handled before any plastic goes down. We'll ask you to clear out stored things so the cover can reach every part of the floor, and then our installers lay the plastic across the ground and fasten it in place. Department of Energy guidance calls for a sheet at least 6 mil thick, which is six thousandths of an inch, carried up the walls, piers and columns and securely attached, so when you compare bids, check that each one names a sheet that thick or thicker.
Damp ground isn't always the only moisture problem in a house, so if you're also seeing it in a basement or behind walls, we handle vapor barrier installation in those areas too. Air also leaks out the top of a house and pulls air up from below, which is why many people pair the crawl space with attic air sealing, closing the gaps around pipes, lights and the hatch.
Vented crawl space
If your crawl space has vents to the outside, the job is laying and fastening the cover, because the federal guidance saves seam sealing for unvented spaces. It's the simpler version of the job, and it suits the many older houses that still have vents in the foundation walls.
Unvented crawl space
If the crawl space is closed off from outside air, the seams and every spot where a pipe or post comes through the plastic get sealed with a durable sealant that suits the sheet. That adds time and material, and it's the step the guidance calls for when the space has no vents.
Crawl space vapor barrier permits and houses in State College
The Centre Region Code Administration issues building permits here, and it asks that you apply before any construction or remodeling work begins. Whether a vapor barrier on its own needs one isn't something I'd guess at, since permit rules depend on your municipality, so we check with the office that covers your address. Where a permit applies, we prepare the paperwork, walk you through it and keep you posted on where it stands. If the crawl space is part of a new addition in the Borough of State College, the Borough Engineer's Office and Planning Department approve that permit as well.
Most of our calls come from homeowners in drafty older houses, and a lot of those crawl spaces have low clearance, bare dirt, old plastic that never reached the corners and years of stored things on top. We see the same kind of crawl spaces on jobs in Bellefonte and Tyrone, and we work across the area and the cities around State College, so if yours isn't listed, please ask us.
Why State College homeowners call Apex State College Spray Foam Insulation for crawl space work
I write every estimate myself
I come out to look at your crawl space and write the estimate myself, and our installers do the work. Before we finish, I check it with you, so the person who planned the job is the one who signs off on it.
Furnace and fresh air discussed first
If a gas or oil furnace or a water heater shares the space, we talk through fresh air and those appliances before we begin, along with any time you'd need to be away. You'll know what's happening under your floor before it happens.
Licensed and insured for this work
We're licensed and insured. That protects you and your house while our installers are working in the tight space under your floor.
Trained on local jobs first
I spent several years as the right hand to another insulation contractor in this area, running jobs, before I started this business in 2023. The older houses and crawl spaces around here aren't new to me.
Under a house, the order of the work matters most, so the first step is letting me see your crawl space. Please request an estimate or call (814) 996-0002.
Request a quoteGet a written estimate for your crawl space vapor barrier
We reply within one business day to set a time that suits you. I come out, look over your crawl space and go over what I find with you before anything is written up. Then you get a written estimate, free and with no obligation.
What happens after you call about your crawl space
Call or send the form
Tell us a little about the crawl space and how to reach you. We get back to you and set a time for me to come out.
I look over the crawl space
I check the floor, walls and vents and go over what I find with you before anything is written up. Your written estimate shows what the job includes, whether water or mold work comes first, and the price.
Permit and prep get sorted
We take care of the permit side where one applies. Before the work day, you clear out stored things so the cover can reach the whole floor.
Installers work, I check it
Our installers lay and fasten the barrier and seal it where the space calls for that. I check the finished work with you before we call it done.
Frequently asked questions
How much does a crawl space vapor barrier cost in State College?
A basic crawl space vapor barrier, plastic over the dirt floor only, usually costs about $0.50 to $1.50 per square foot across the US. That's the market's price for the plain job, and yours goes up if water or mold has to be dealt with first, if the sheet runs up the walls and piers, or if an unvented space needs its seams sealed. I'll give you your own figure in a written estimate once I've seen the space.
How do I deal with mold or standing water before a vapor barrier goes in?
The mold and water get fully dealt with first, because plastic laid over a wet floor just holds the problem underneath it. One barrier maker's guide says active mold and standing water must be fully addressed before its barrier goes in, which means removing the mold, fixing every moisture source and drying the space. I'd want to see your crawl space before saying what that takes.
Does a crawl space vapor barrier help with radon?
A well-installed vapor barrier helps cut down soil gases such as radon, but it isn't a radon system. Under the Pennsylvania Department of Environmental Protection's draft standards, a crawl space radon system uses a fan to draw air from under a fully sealed membrane, and the firms authorized for radon work in the state are called certified. That's separate work from ours, so a radon system is a job for a certified radon firm.
What causes moisture in a crawl space?
Most crawl space moisture rises from the bare dirt floor as vapor, and rainwater that collects around the foundation adds to it. Older federal guidance points to gutters that carry rain away and ground that slopes away from the house, so it's worth looking at both while we're working on the crawl space.
Do I have to leave the house while you install a crawl space vapor barrier?
Usually not, because the work happens under the floor and our installers mostly need a clear path to the crawl space entrance. If mold or water work has to come first, I'd want to see it before telling you, and we settle any time away together before the work day.
What should I ask a contractor installing a crawl space vapor barrier?
Ask how they overlap the seams and fasten the sheet, because the federal guidance calls for overlapped seams and secure attachment. It's also fair to ask whether they've checked if your crawl space is vented, since that decides whether the seams get sealed.
Other work that often goes with a crawl space barrier
Vapor barrier installation
If damp shows up beyond the crawl space, such as on basement walls or where moist air meets cold surfaces, we can plan barriers for those parts of the house too.
Attic air sealing
Air leaking out through gaps at the top of the house pulls air up from below, so closing gaps around pipes, lights and the attic hatch helps the whole house.
State College, PA
Get your crawl space looked at
If you can tell us the rough square footage, whether it has vents and any water or mold you've seen, I can plan the visit before I arrive.