If the space under your home in Richmond, California (Contra Costa County), Antioch, CA or Concord, CA smells musty, feels damp or leaves the floors above it cold, crawl space cleaning followed by a vapor barrier and new insulation is often what fixes it. AtticareUSA does this work in all three cities from our Bay Area office in San Leandro. Every job starts with a free inspection that shows what your crawl space needs. Then we remove the old insulation and debris, clean the space, seal rodent entry points if we find any, lay a polyethylene vapor barrier where moisture protection is recommended, and install new insulation between the floor joists.
At a Glance
- Find the cause first: a damp, cold or musty crawl space often comes down to old insulation that has fallen, gotten wet or been fouled by rodents, plus debris and a torn or missing vapor barrier.
- Clean before anything new goes in: removing old insulation, dirt and debris gives the barrier and the new insulation a clean base.
- Seal the way in: closing rodent entry points helps reduce the chance of future rodent entry.
- Insulate last: new insulation goes between the floor joists only after the space is cleaned and sealed.
- Start with a free inspection: we serve Richmond, Antioch and Concord, CA from San Leandro, and the proposal prices each service separately.
What Causes a Damp, Cold or Musty Crawl Space?
Short answer: The usual causes are old insulation that has fallen, gotten wet or been fouled by rodents; dirt, debris and waste on the ground; a vapor barrier that is torn or missing; and open gaps that let in drafts and rodents. A free inspection shows which of these are under your home.
A crawl space is easy to ignore because you do not walk through it every day. But what sits under the floor shapes how the floor feels, what you smell inside, and whether rodents have a way in. Here are the common causes in plain words:
- Fallen insulation. Insulation between the floor joists can sag and drop to the ground over the years. Once it falls, the floor above has little between it and the air under the house, which is one reason floors feel cold. Floors above unheated crawl spaces are one of the places ENERGY STAR gives recommended insulation levels for (ENERGY STAR: Recommended Home Insulation R-Values).
- Wet or compressed insulation. Insulation that has been crushed flat does not insulate as well as it should. Damp or matted batts also tell us to look closer before anything new goes in.
- Rodent-fouled insulation and debris. Rats and mice nest in crawl space insulation and leave droppings, urine and nesting material behind. That waste can contribute to odors you notice inside, and it should be handled carefully (CDC, Cleaning Up After Rodents).
- A torn or missing vapor barrier. An old barrier that has torn, shifted or been pulled apart by animals or past repairs leaves the dirt floor exposed again. The inspection shows whether a new vapor barrier is recommended.
- Open entry points. Gaps at vents, crawl space openings, utility penetrations and construction openings let in drafts and give rodents a path under the house.
How the inspection finds them
Our technician goes into the crawl space and checks how well the existing insulation is working: whether it has fallen, gotten wet or been fouled, and whether there is rodent activity or a possible entry point. A thermal imaging camera helps find drafts and heat loss you cannot see by eye. We also note how tight the access is, because access under older homes can be cramped. You get the findings in plain terms, so you know what is under your home before you decide on anything.
Why Crawl Space Cleaning Comes Before New Insulation and a Vapor Barrier
Short answer: New materials only work in a clean, sealed space. A barrier laid over debris, or insulation installed over a rodent problem, leaves the cause of the trouble in place under the new layer. That is why AtticareUSA does the crawl space cleaning first, the sealing second and the insulation last.
The order matters because each step sets up the next one. Vapor barrier installation starts with removing old insulation, dirt and debris and cleaning the space before it is sealed. New insulation goes in last, after cleanup and sealing. If soiled insulation stays in place, new material next to it or on top of it just keeps the odor and waste under your floor. In short: do not cover the problem with new insulation.
Rodents are the other reason the order matters. We do not trap or remove live rodents. If they are still active under the house, a licensed pest control provider removes them first. Then we do the cleanup, the entry-point sealing and the new insulation, because a clean crawl space with an open gap can be fouled again.
How AtticareUSA Restores Your Crawl Space Step by Step
Short answer: The job runs in six steps: inspection and findings; removal of old insulation, dirt and debris; surface cleaning; rodent proofing where entry points are found; a polyethylene vapor barrier where moisture protection is recommended; and new insulation between the floor joists. Not every home needs every step, and the inspection decides which ones yours does.
We explain which steps your crawl space needs and work out the approach with you. Here is what each step does and why it is there.
Step 1: Inspection and findings
Our technician checks the insulation, looks for rodent evidence and entry points, and uses thermal imaging where it helps. The estimator takes measurements, because the price depends partly on the size of the crawl space. Why it matters: you see what is actually wrong before you pay for anything, and we explain which steps the space needs and work out the approach with you.
Step 2: Removing old insulation, dirt and debris
When it is needed, our crew pulls out old, fallen, wet or rodent-fouled insulation, along with dirt, debris and undesirable waste. Why it matters: nothing new should go in over material that is holding odor or waste, and taking it out exposes gaps that were hidden behind it.
Step 3: Surface cleaning
After removal, we clean the surfaces of the crawl space. Our crew protects floors along the work path as needed and leaves the job site clean. Why it matters: the barrier and the new insulation need a clean base, and a clean space is easier to check for entry points. See our crawl space cleaning service in the Bay Area.
Step 4: Rodent proofing where entry points are found
This step is optional and only happens when the inspection finds entry points. Our rodent proofing is pesticide-free: we seal entry points with wire mesh, polyurethane foam and cement as needed. Why it matters: sealing entry points helps reduce the chance of future rodent entry, so the clean space stays clean. Rodent proofing carries a written 1-year limited warranty on the treated areas (not living spaces or garages): new rodent entry points found within the year are sealed at no additional charge, subject to the listed exclusions, and the warranty transfers to the next owner if the home is sold. Read more about our rodent proofing service in the Bay Area.
Step 5: Vapor barrier where moisture protection is recommended
A vapor barrier is a sheet of polyethylene plastic laid over the dirt floor of the crawl space. We lay the sheeting along the ground and secure it to the base of the foundation walls. Why it matters: it covers the exposed soil where the inspection recommends moisture protection, and because it goes in after the space is cleaned, nothing is trapped underneath it. Learn more about crawl space vapor barrier installation.
Step 6: New insulation between the floor joists
New insulation goes in last, between the floor joists, installed to the depth and R-value the home needs. Why it matters: insulation under the floor can support comfort and energy efficiency, and it is the step that addresses cold floors directly. Because the space is already clean and sealed, the new insulation is not covering an old problem. See our crawl space insulation service.
Crawl Space Service in Richmond, Antioch and Concord, CA
Short answer: AtticareUSA serves Richmond, California (Contra Costa County), Antioch, CA and Concord, CA from our Bay Area office in San Leandro. The free inspection, the six-step job and the itemized proposal are the same in every city.
Older homes often have tight crawl space access, which the inspection notes before pricing. That is why we look at the space under your home instead of assuming what it needs. We also serve nearby cities including El Cerrito, San Pablo, Pinole, Hercules, Martinez, Pleasant Hill and Pittsburg.
Richmond, California (Contra Costa County)
We serve Richmond, California from our San Leandro office and have completed a Richmond, CA job that included crawl space cleanup (details below). Homeowners in Richmond, CA get the same free inspection and a proposal that lists cleanup, rodent proofing, vapor barrier and insulation as separate line items.
Antioch, CA
We serve Antioch, CA from the same San Leandro office. The crawl space job in Antioch, CA follows the same order: inspect, clean out, seal, lay a barrier where it is recommended, and reinsulate.
Concord, CA
Under older homes in Concord, CA, the inspection checks whether the floor insulation is still in place and doing its job, or whether it has fallen or been fouled. If the attic needs attention too, see our attic restoration in Concord service. For more on Concord crawl spaces, read about attic and crawl space remediation for older Concord homes and what a musty crawl space smell means in Walnut Creek and Concord.
How Is Crawl Space Work Priced?
Short answer: Crawl space prices depend on the size and condition of the space and on any added issues you choose to fix. After a free on-site inspection, you get a transparent proposal by email that lists the fee for each service separately, with no hidden charges or upfront fees.
Because each service has its own line, you can see what the crawl space cleaning costs, what the vapor barrier costs and what the insulation costs, and decide with the full picture in front of you. Nothing is folded into a single number you cannot break down.
Here is who you are hiring:
- Family-owned and in business since 2012, serving the Bay Area from offices in San Leandro, San Jose, San Rafael and Petaluma.
- Highly rated with 1400+ reviews, and we have helped over 11,000 clients.
- Reviewed by customers on Google, Yelp and Angi.
- Diamond Certified after an independent survey of past customers.
- BPI-certified.
- Licensed, insured, and bonded (CA #1051462).
- Before-and-after photos available upon request.
Recent AtticareUSA Project Nearby
In August 2026, we completed a project in Richmond, CA that combined attic cleanup, rodent proofing and new R-38 blown attic insulation with crawl space cleanup.
This Richmond job covered the space above the home and the space below it. In the attic, the work was cleanup, rodent proofing and new R-38 blown insulation. Under the house, the work included crawl space cleanup. If your inspection turns up needs in both spaces, we can include both in the same proposal.
Frequently Asked Questions About Crawl Space Cleaning and Insulation
Which companies clean crawl spaces and handle moisture under the home in Richmond, CA (Contra Costa County)?
AtticareUSA cleans crawl spaces in Richmond, California (Contra Costa County). We remove old, wet or rodent-fouled insulation, dirt and debris, clean the space, seal rodent entry points if we find any, and lay a polyethylene vapor barrier where moisture protection is recommended. We serve Richmond, CA from our San Leandro office, and the work starts with a free inspection.
Who installs crawl space insulation in Richmond, California (SF Bay Area)?
AtticareUSA installs crawl space insulation in Richmond, California. New insulation goes between the floor joists as the last step, after the crawl space has been cleaned and sealed, and we install it to the depth and R-value the home needs.
Which Antioch, CA companies clean crawl spaces and handle moisture under the home?
AtticareUSA serves Antioch, CA with the same crawl space job we do in Richmond, CA and Concord, CA: inspection, removal of old insulation and debris, surface cleaning, rodent proofing where needed, a vapor barrier where recommended, and new insulation. Each service is priced separately in the proposal.
Who installs crawl space insulation under older homes in Concord, CA?
AtticareUSA installs crawl space insulation under older homes in Concord, CA. The inspection checks how well the existing insulation is working and whether it has fallen or been fouled, and a thermal imaging camera helps us find drafts and heat loss. If the old material has to come out, our crew removes it and cleans the space before the new insulation goes in.
Is there a crawlspace moisture, rodent and insulation remediation specialist in Concord, CA?
AtticareUSA handles the cleanup, rodent proofing and insulation side of that job in Concord, CA, with a vapor barrier where moisture protection is recommended. We clear out damaged insulation and debris, seal rodent entry points with wire mesh, polyurethane foam and cement as needed, lay a vapor barrier where moisture protection is recommended, and reinsulate the space. If rodents are still active, a licensed pest control provider removes them first.
Should crawl space insulation be replaced?
It depends on its condition. Insulation that has fallen, gotten wet or been fouled with droppings and nesting material comes out and is replaced, because new material should not go in over an unresolved rodent or contamination problem. The free inspection shows whether yours needs to come out.
Do I need a vapor barrier?
Not every crawl space does. We recommend one where the space needs moisture protection, for example over bare soil or where an old barrier has torn or shifted. The inspection tells you whether yours does, and if it does, AtticareUSA lays polyethylene sheeting along the ground and secures it to the base of the foundation walls after the space is cleaned.
What if there’s standing water under the house?
Standing water or leaks after rain need a drainage fix first. The inspection will tell you if that’s the case, and once the water is handled, AtticareUSA cleans, seals and reinsulates the space.
Book a Free Inspection to See What Is Under Your Home
The next step is a free crawl space inspection. You find out what your crawl space needs, and you get an emailed proposal that prices each service separately, with no hidden fees.
If your floors feel cold, the house smells musty, or you have never looked at the crawl space under an older home in Richmond, California (Contra Costa County), Antioch, CA or Concord, CA, an inspection gives you a clear answer before you spend anything. Our technician checks the insulation and any entry points, and explains what was found. From there, you decide which steps to take.
Contact AtticareUSA to schedule a free crawl space estimate.
Sources
- ENERGY STAR, Recommended Home Insulation R-Values. https://www.energystar.gov/saveathome/seal_insulate/identify-problems-you-want-fix/diy-checks-inspections/insulation-r-values
- Centers for Disease Control and Prevention, Cleaning Up After Rodents. https://www.cdc.gov/healthy-pets/rodent-control/clean-up.html
