Vapor barrier installation in Sugar Land TX - a crawl space floor covered and checked
Damp, musty air under the house and a bare dirt floor? We cover the ground and carry the sheet up the walls and piers.
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What does a vapor barrier under my house actually do?
Vapor barrier installation in Sugar Land puts a plastic ground cover over the dirt floor of your crawl space. A well-installed one helps cut down the moisture vapor and soil gases, radon among them, that rise from the ground into the space under your house.
Most calls about this start with cold floors, a damp smell coming up through the house, or someone looking under there and finding bare dirt or old plastic torn to pieces. At C&M Sugar Land Spray Foam Insulation we're based in Sugar Land and work in the cities around it. On these jobs the price depends on how much ground there is to cover, how much has to be hauled out first, how many piers the sheet has to wrap, and whether the crawl space is vented or sealed. The schedule mostly depends on drainage, because if water stands under the house, we fix that before any plastic goes down. My estimate lists the steps we plan in order, so you can see what comes first and why.
How our vapor barrier installation goes
If I find standing water or a plumbing leak on my first look, we fix that before anything else, because plastic over a wet problem just hides it. Then we clear out stored items and debris, since a sheet laid over boxes and old lumber leaves the ground under them uncovered. We cover as much of the ground as we can reach and carry the sheet up the walls and piers, so moisture has a harder time getting in around the edges. Before we leave, I go under with a light and check the seams and edges myself, because a gap you can't see from the access hole is still a gap.
Covering the ground is often the first step, not the last. Air tends to move up through a house and out the top, and attic air sealing, which means closing the gaps around can lights, pipes and the hatch, cuts down how much damp air the house pulls up from below. If your house is older and the insulation it has is thin, retrofit insulation adds to what's already there in a house you're living in, and we do it after the sealing, in that order.
Vapor barrier installation in Sugar Land: permits and flood zones
The Sugar Land Permits Office handles permits in the city, and the city uses the International Code Council codes for applicable projects. The city's pages don't settle whether a crawl space ground cover needs a permit. So before we start, I check whether the city or the county covers your address and ask that office.
Drainage comes first on this job, so it helps to look up your lot's flood zone by address on the city's floodplain map before I come out. Under houses here we usually find stored boxes, scraps from old repairs and plastic that never reached the walls, and we see the same thing on jobs in Stafford and Missouri City.
Crawl space vapor barrier work
Get a vapor barrier estimate for your crawl space
We reply to every request within one business day and set a time for me to come out. The estimate is free and done on site, there's no obligation, and it lists the steps we plan in order. It helps to have your crawl space's rough size handy and to know whether it has vents.
(832) 303-7078Sugar Land vapor barrier questions
How much does a crawl space vapor barrier cost in Sugar Land?
Basic crawl space vapor barrier work, plastic over the dirt floor only, usually costs about $0.50 to $1.50 per square foot across the US. That's a national range for the basic job, so sealed seams, a heavier sheet, a big cleanout or drainage work will push yours higher, and your estimate shows what's included.
Does a vapor barrier have to cover the whole crawl space floor?
Yes. Installation guidance calls for covering all of the ground, or as close to all of it as is reasonably possible, with the sheet carried up the walls, columns and footings. When you compare bids, ask whether the cover reaches every part of the ground and runs up each wall and footing. Ask too whether the sheet meets the guidance's minimum thickness and maximum perm rating, which is a measure of how much vapor gets through it.
Do the seams on a crawl space vapor barrier need to be sealed?
Guidance calls for sealing the seams only in a crawl space without vents. Every pipe or post that comes through the sheet gets sealed as well, with a durable sealant that works with the plastic. So check whether your foundation walls have vents, because that tells you whether a bid should include sealed seams.
What is the best way to prepare a crawl space for a vapor barrier?
Get the drainage right first. A 2006 Florida study of manufactured homes with solid skirting says the ground under the house must sit higher than the ground outside before a cover goes in, so that a flood leaves no standing water. Guidance adds that the cover should leave the existing drainage paths as they are. In that study, the cover slowed the rise in dewpoint, a measure of moisture in the air, but the air under the home stayed damper than the air outside, so I treat the sheet as one part of a dry crawl space and not the whole fix.
Should I put a plastic vapor barrier inside my walls?
In a hot, humid climate, plastic on the inside of the wall framing is usually a bad idea. A Building Science Corporation sheet says a Class I or II vapor layer there, the tightest kinds, such as plastic sheet, can cause walls to fail early, and often does, because moisture moving inward condenses on it. A ground cover under the house is a different job, and it's the one this page is about.
How do I contact the Sugar Land Permits Office?
Call 281-275-2270 or email permits@sugarlandtx.gov, Monday to Friday, 8 a.m. to 5 p.m. If your job needs a permit, we handle the application, so you'd only need to reach the office with a question of your own.
Schedule a crawl space estimate in Sugar Land
Call (832) 303-7078 or send the form, and if you can move stored things out from under the house before we come, we can get straight to the ground.