QuietCore Pasadena Spray Foam InsulationQuietCore Pasadena Spray Foam Insulation

Crawl space insulation in Pasadena CA - warmer floors and insulation that stays up

Cold floors and drafty rooms in winter? We insulate the crawl space walls or the floor above, in the right order, for warmer floors.

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Crawl space with a black vapor barrier covering the floor beneath a white pipe and flexible ductwork.
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Crawl space insulation
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(626) 345-7649

How can you tell your crawl space needs insulation?

  • Floors cold underfoot

    If the rooms over the crawl space feel cold through your socks every winter, the floor above usually has thin insulation or none at all. Each heating season you wait, the heater runs harder to make up for heat slipping out through the floor.

  • Insulation hanging down

    If you look under the house and see insulation drooping or lying on the dirt, it was most likely held up by a tight fit and nothing else. Once it pulls away from the floor it isn't doing much, and more of it tends to come down the longer it's left.

  • Drafts near the floor

    Cold air around baseboards, floor registers or where pipes come up through the floor means air is moving up from the crawl space. Adding insulation alone won't stop that air, so you keep paying to heat air that leaks right back out.

How does crawl space insulation work in a Pasadena house?

Crawl space insulation in Pasadena adds insulation either along the crawl space walls or in the floor right above it, so less heat escapes through your floor and the rooms over it stop feeling cold underfoot. At QuietCore Pasadena Spray Foam Insulation, we look the crawl space over first, then help you choose the approach that fits your house.

Most people call us about cold floors in winter or after spotting insulation hanging under the house, and they aren't sure whether to fix the floor or the whole crawl space. The price mostly turns on how big the space is, how easy it is to crawl through, whether old insulation has to come out and whether we insulate the walls or the floor, and the schedule turns on those same things plus any permit or safety work that has to come first, so your written estimate gives you your own figure and the order of work. If your job needs a permit, we find out whether the city or the county covers your address and pull it ourselves, inspection included. We're based in Pasadena and do this work across the cities around it, including Glendale, Burbank, Arcadia and Altadena.

Details to note before an estimate

  • Rough size of the crawl space
  • Rooms with cold floors
  • Furnace or water heater under the house
  • Old wraps on pipes or ducts

How we handle crawl space insulation

On every crawl space job I start by looking for fuel-burning equipment and old wraps on the pipes and ducts, because those decide what we can safely close up. In older houses those wraps can contain asbestos, and if we find any, a certified asbestos abatement firm has to inspect them and choose the treatment before our crew works near them. Then we sit down with you and decide between insulating the crawl space walls and insulating the floor above. When it's the floor, we fit the insulation snug against the subfloor, the boards right under your flooring, with no gap between them, and we support it, because insulation held up only by a tight fit tends to sag or fall. We clean up the crawl space before we leave.

Cold floors rarely come alone. Gaps where pipes, wires and ducts pass through the floor let crawl space air straight into the house, so we often pair this job with air sealing services before the insulation goes up. If the rooms above still lose heat through the outside walls, wall insulation is the next place we look.

Work that often goes with it

  • Air sealing services

    Closes the small openings around pipes, wiring and registers that let cold air and dust drift up from under the house.

  • Wall insulation

    Fills the outside walls of an older house so the rooms hold their heat once the floor below is done.

What happens after you call about your crawl space?

  1. Call or send a request

    Call (626) 345-7649 or use the form, and we get back to you to set a time that works. Mention any furnace or water heater under the house, since that changes what I look at first.

  2. I look under the house

    I come out, look at the crawl space with you and give you a written estimate. It lays out the price, what gets done first and why, so you see where the money goes before you decide.

  3. Our crew does the work

    When you're ready, our own trained crew does the job in the order the estimate lays out. Any safety work it calls for comes before the insulation goes in.

  4. We walk through it together

    I go over the finished crawl space with you before we call the job done. You see the supports, the sealed gaps and the cleanup for yourself.

Questions before you book crawl space insulation

How do I decide between insulating my crawl space walls or the floor above?

Air sealing and insulating along the crawl space walls, so the crawl space becomes part of the house, is considered best practice in every climate, though in some houses the floor above works better as the line between warm and cold. If your ducts run down there, the walls usually win because they bring the ducts inside, once any gas equipment is sorted out. If the space is bare and the floor is easy to reach, insulating the floor is usually the simpler job.

Is it safe to just close my crawl space vents?

No, closing the vents by itself can raise the moisture down there, and if a gas furnace or water heater in the crawl space draws its air naturally, it can create a deadly situation. A safe plan covers moisture and any fuel-burning equipment, not just the vents, which is why those are the first things I check.

Who is licensed to insulate a crawl space in California?

California licenses insulation work under the C-2 Insulation and Acoustical class, and a license is required whenever the job needs a permit or the contractor hires workers, even on jobs under $1,000. Anyone pulling a permit in Pasadena also has to show a City of Pasadena Business License when they arrive. We're licensed and fully insured.

How much does crawl space insulation cost around Los Angeles?

Insulating a crawl space in the Los Angeles area usually costs about $1,700 to $7,500 per project. Where your house lands depends on the size of the space, how hard it is to work in, whether old insulation comes out first and whether we do the walls or the floor. Your written estimate gives you the figure for your own house.

What is the best way to cover the dirt in a crawl space?

A well-installed vapor retarder, a moisture barrier laid over the ground, is the usual answer, because it helps cut down moisture vapor and soil gases such as radon coming up from the dirt. It's often done along with insulation, and we cover it on our crawl space vapor barrier page.

Is there a Pasadena rebate for crawl space insulation?

Pasadena Water and Power has a ceiling insulation rebate, and its terms call for insulation added to the attic or a crawl space above your ceiling, or to the roof of a non-vented attic. That ties it to the space over your rooms, so read its terms before you count on it for insulation under the floor.

Get a written crawl space plan for your house

Send your address, the rough size of the crawl space and anything you've seen down there, and we'll reply within one business day to set up a free visit at your property, with no obligation. After I look it over with you, you get the plan and the order of work in writing. Your satisfaction, guaranteed.

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Find out what's under your floor

Call (626) 345-7649 or use the form, and I'll come see what's down there before the next cold stretch has you paying to heat the crawl space.

Request an estimateCall (626) 345-7649