Vapor barrier installation in Pasadena CA - a ground cover taped seam to seam
Musty smell or damp air coming up through the floors? We cover your crawl space ground and tape every seam so soil moisture stays under the plastic.
- Service
- Vapor barrier installation
- Call
- (626) 345-7649
How can you tell your crawl space needs a vapor barrier?
Musty smell in the house
If the rooms over the crawl space smell musty, damp air from under the floor is usually working its way up into the house. Left alone, that damp keeps feeding the smell and can start to show up in the wood framing down there.
Bare dirt under the house
When you open the hatch and see plain dirt, nothing is stopping moisture in the soil from rising into the space. The longer that goes on, the longer the wood, ducts and any insulation under your floor sit in damp air.
Old plastic torn or bunched up
A lot of older houses have thin sheeting that's been ripped by years of people crawling over it, or pushed into piles along the walls. A cover with holes only does part of the job, because every bare spot keeps letting moisture through.
What does a crawl space vapor barrier do for a Pasadena house?
Vapor barrier installation in Pasadena means covering the whole dirt floor of your crawl space with plastic sheeting and taping every seam, so moisture rising out of the soil stays under the cover instead of soaking into the wood framing and drifting up into the rooms above.
Most people who call us have opened the hatch and found bare dirt, or old plastic that's torn and shoved against the walls, and they want to know what it takes to set it right. The price mostly comes down to the size of the space in square feet, how hard it is to move around in, how heavy a sheet you pick and whether the space stays vented or gets sealed, which is a bigger job. The schedule turns on what we find first, because a leak or a pile of old debris has to be dealt with before any plastic goes down, and your written estimate lays out that order for your house. If your job needs a permit, we find out whether the city or the county covers your address and pull it ourselves, and Pasadena requires a city business license of any contractor who pulls one.
Details to note before an estimate
- Rough crawl space size in square feet
- Any known plumbing or foundation leaks
- Water heater or furnace in the crawl space
- Old plastic, debris or standing water
How we handle vapor barrier installation under your house
I start by looking for plumbing and foundation leaks before any sheeting goes down, because a sealed cover over a leak just holds the water in and turns the crawl space into a tub. If we find one, it gets handled first, usually by a plumber, and then our crew clears out debris, old torn plastic and any plants or roots on the ground so nothing rots under the new cover or pokes through it. We lay the sheeting across the whole floor, overlap the pieces and tape the seams, and we tape any tear we find along the way so the cover stays in one piece.
A ground cover often goes along with other work in an older house. Warm air leaving through the top of the house pulls air up from below, so attic air sealing closes those gaps and eases the draw on the crawl space. Once the ground is covered, it's also a sensible time to look at retrofit insulation for the floors and walls of a house that never had much.
Work that often goes with a vapor barrier
Attic air sealing
Closing the gaps around lights, pipes and the hatch upstairs means the house pulls less air up from underneath.
Retrofit insulation
Adds insulation to the floors and walls of a house that's already built and lived in, often the next step once the crawl space is covered.
What happens after you call about a vapor barrier?
Tell us about your crawl space
Call (626) 345-7649 or send the form with a few lines about what's under your house. We'll set a time for me to come out and take a look.
I look underneath with you
I check the crawl space for leaks, damp, pest damage and old plastic, and for anything like a gas water heater that changes the plan. You get a written estimate that lays out what gets done first and why, so you know what the job involves before anything starts.
Our crew lays the cover
When you're ready, our own trained crew clears the ground, lays the sheeting and tapes the seams and tears. Anything that had to be fixed first is already done by then.
We walk the finished job
I go over the finished crawl space with you before we call it done. You see the taped seams and edges for yourself.
Questions about crawl space vapor barriers
Does a crawl space that looks dry still need a vapor barrier?
Usually yes, because even dirt that looks dry can give off a lot of water vapor through the soil. You won't see it as puddles, but it ends up in the air under your floor and in the wood around it.
Is it better to keep my crawl space vented or seal it in Pasadena?
Either way the ground needs a durable cover, so the real choice is about the vents. One building magazine says vented crawl spaces in dry climates tend to do well year-round, and that this can hold where summers are hot and dry even if winters turn cold and damp, so I don't push sealing on every house. If you do seal, the same magazine says the air in a sealed, insulated crawl space has to be conditioned to meet code and end moisture problems, and the right way to do that depends on your budget, the furnace or central air you already have and how much energy you want to use.
How do I choose the right vapor barrier sheeting for a crawl space?
Choose sheeting tough enough for you and any plumber or electrician to crawl across without tearing it, and go heavier than the bare minimum if you can. Ask any contractor how thick the sheeting in their quote is and whether the price covers taping every seam and any tears or holes.
How do I know if sealing my crawl space is safe with a gas water heater down there?
One federal checklist for this work calls for a combustion safety test afterward when a natural draft water heater or furnace, the kind that relies on rising heat to push exhaust out, sits in the crawl space. The test checks that exhaust isn't flowing the wrong way or spilling into the space, so mention any gas appliance down there when you call.
Does a small crawl space job still need a licensed contractor in California?
It does if the work is subject to a permit of any kind, according to California's Contractors State License Board, and the same goes when the person doing it hires workers to help, even if the job is under $1,000. We're licensed and fully insured, and our own crew does the work.
How much does crawl space encapsulation cost around Los Angeles?
Fully sealing a crawl space in plastic, what most people call encapsulation, usually runs about $2 to $11 per square foot in the Los Angeles area. That's the going range for the work around here, not our price, and where a job lands depends on the size of the space, how heavy the sheeting is and whether the space gets sealed and conditioned or stays vented with a ground cover. I'll measure yours and put the plan in writing when I come out.
Get a written plan for your crawl space vapor barrier
Send the form and we'll get back to you within one business day to set a time. I come out to look at the crawl space myself, and the estimate is free, done at your property and comes with no obligation.
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Get your crawl space covered right
One visit under the house tells you whether your old plastic can stay, what needs fixing first and what the job involves.