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A damp crawl space with a puddle on the dirt floor, sagging pink insulation, mold on the joists and white mineral stains on the block wallsThe crawl space with a heavy white vapor barrier liner on the floor and walls with taped seams, a drain pipe and sump at the wallThe finished crawl space with white liner, white foam board on the walls, sealed vents, a dehumidifier, a sensor and bright lights under clean joists
Air humidity90%
Wood moisture26%
Mold riskHigh
90% humidity

Drag the dial

Drag the dial to dry out the crawl space.

Water in the air: 90%

  • Reason 1We look firstA real inspection with a moisture meter, a camera and photos comes before any plan, so the fix matches the problem.
  • Reason 2Water before everythingLiquid water, humid air and leaks each need their own answer. We find the source before we seal anything.
  • Reason 3One crew, the whole jobDrainage, liner, insulation, mold control and structural repair planned together and done by people who do it every week.
  • Reason 4Proof it workedMoisture and humidity readings before and after, with photos, so you can see the difference and keep a record.
Follow the air

Where the air in your home really comes from

Warm air rises and pulls air up from below. Pick a setup and watch where the damp air goes.

    Damp air reaching your living space
    High

    An illustration of how air moves. Real numbers depend on your house, your climate and your soil.

    Watch the work

    A damp crawl space, finished in five steps

    Scroll and watch the work roll across the picture, from water on the floor to a clean, dry space.

    A damp crawl space with a puddle on the dirt floor, sagging insulation and mold on the joistsThe same crawl space with the water gone, a gravel floor, a perforated drain pipe and a round sump basin, and the old insulation removedThe same crawl space with a heavy white vapor barrier liner across the floor and up the block walls with taped seamsThe same crawl space with white foam board on the walls, the foundation vent closed and spray foam at the rim joistThe finished crawl space with white liner and wall board, a dehumidifier, a humidity sensor and bright LED lights along the joists
    1. 1
      TodayWater on the floor, sagging insulation, mold on the joists and bare dirt: where most jobs start.
    2. 2
      Drained and cleanedThe water is out, the floor is gravel, a drain runs to a sump and the old insulation and mold are gone.
    3. 3
      LinedA heavy white liner covers the floor and runs up the walls with taped seams.
    4. 4
      Sealed and insulatedFoam board on the walls, foam at the rim joist and the vents closed.
    5. 5
      Dry for goodA dehumidifier, a sensor and bright lights finish a clean, dry space.

    Keep scrolling and watch the work roll across the picture.

    Spot the problems yourself
    How damp is it?

    A quick read on your crawl space

    Answer six questions and see a moisture risk score with the services that fit.

    Your climate
    The crawl space floor
    Foundation vents
    Water signs
    Smell upstairs
    Insulation
    Call 800-224-9245

      A planning aid built on common moisture factors, not an inspection. Only a visit with a meter and a camera shows what is really happening under your floor.

      How a job goes

      Five steps from the first look to a dry finish

      Follow the work from the first visit to the yearly checkup.

      1. 1An inspector in a white coverall crawling through a crawl space with a flashlight and a tablet
        Step 1

        The visit

        A technician goes under the house with lights, a camera and a moisture meter and looks at everything: soil, walls, joists, vents, pipes and insulation.

      2. 2A hand pressing the pins of a moisture meter into a wooden floor joist in a crawl space
        Step 2

        The readings

        Moisture in the wood, humidity in the air and the dew point are measured, so findings come with numbers and not guesses.

      3. 3A homeowner and a technician at a kitchen table reviewing crawl space photos and a tablet
        Step 3

        The plan

        You get photos, readings and a ranked plan: what to fix first, what can wait and what to watch.

      4. 4Two installers unrolling a thick white vapor barrier liner across a gravel crawl space floor
        Step 4

        The work

        Water is handled first, then cleaning and repairs, then liner, insulation and humidity control, all by one crew.

      5. 5A technician checking a dehumidifier and a humidity sensor in a clean encapsulated crawl space
        Step 5

        The checkup

        We test the system with you, leave readings and notes and come back once a year if you want a checkup.

      See the difference

      Same space, before and after

      Pick a project, then drag the picture to compare.

      The same crawl space finished with white liner on the floor and walls, wall board, sealed vents, a dehumidifier and bright lights
      A damp crawl space with a puddle on the dirt floor, sagging pink insulation, mold on the joists and white stains on the block walls
      BeforeAfter
      A damp crawl space with a puddle, sagging insulation and mold becomes a dry, sealed space with a liner, wall board and a dehumidifier.Drag anywhere on the picture.
      Two crawl space technicians in navy shirts with headlamps and knee pads beside a white service van and an open crawl space access door
      About Crawl Space Guru

      Crawl space specialists who actually go under the house

      We do one thing: the space under your home. We look first, measure what we see, fix the water before anything else and show you proof when the job is done, in plain English and with a clean finish.

      • Honest adviceIf a small fix will do, we say so. If the space needs the full treatment, we show you why with photos and numbers.
      • Respect for your homeFloors are protected, boots are covered and the access area is cleaned at the end of every visit.
      • Clear plansYou know the findings, the order of work and the schedule before anyone digs or drills.
      • One accountable crewThe people who inspect your crawl space are the people who plan and do the work.

      More about us

      Questions

      Before you call

      What do you do?

      We inspect, dry, seal, insulate and repair crawl spaces: moisture testing, drainage and sump pumps, vapor barriers and encapsulation, dehumidifiers, mold removal, insulation, pest exclusion and structural repair.

      How do I know if my crawl space has a problem?

      Common signs are a musty smell upstairs, cold or soft floors, sticking doors, condensation, visible mold or standing water. Our Moisture Risk Meter gives a quick read, and an inspection with a meter and camera gives the real answer.

      What is encapsulation?

      Covering the soil and walls with a heavy vapor barrier, sealing vents and gaps, adding wall insulation and controlling humidity so the space stays dry and the damp air does not reach your home.

      Should I seal my crawl space vents?

      In humid and mixed climates, sealing is often better, because vents let in moist air that condenses on cool surfaces. We look at your climate, soil and house before we recommend it.

      Can you fix a sagging floor?

      Yes. We find the cause, whether it is damp joists, a weak beam or settled piers, and repair it with sistering, posts, beams or new piers, along with the moisture that caused it.

      Do you remove mold?

      Yes. We contain the area, remove the mold safely, clean and treat the wood and then fix the moisture that caused it, so it does not return.

      How do I get a quote?

      Call or text 800-224-9245, or send the form on any page with a few details and photos. We reply with clear next steps.

      What areas do you serve?

      We serve cities across the country. Use the service map or call to confirm yours.

      Ready to look under the floor?

      Call or text, or send the form. Tell us what you have noticed and we will tell you how we would handle it.

      Request a quote

      Tell us what is under the floor.

      Tell us where the home is, what you have noticed and when you would like it handled. We read every message and reply with clear next steps.

      • What you have noticed, so the right specialist replies
      • Photos of the vents or the access door, or a result you saved from a tool on this site
      • A plain-English plan: the findings, the fix and what to expect, before we start
      Prefer to talk? Call or text800-224-9245

      Your crawl space quote request

      We only use your details to respond to your request.