Basement and crawl space mold
Basement and Crawl Space Mold Removal in Maine
Basements and crawl spaces grow mold because moisture keeps getting in. We remove the mold and control the moisture behind it, so it does not come back.
- IICRC certified
- 4.9 stars from 61 Google reviews
- Lewiston-based, 30+ years in Maine
Tell us what you are seeing downstairs
A few quick questions so the person who calls you back already understands the situation. There is no cost and no obligation.
Why basements and crawl spaces get mold
A damp basement can have more than one source: seepage through the foundation walls, leaks, poor drainage, or humidity that never fully goes away. In many homes the moisture problem is bigger than it first appears.
Crawl spaces are especially prone to it. In Maine’s climate, a vented crawl space takes in humid summer air that hits cold surfaces and condenses, which creates exactly the conditions mold needs. An unencapsulated crawl space is one of the biggest sources of moisture, mold, and energy loss in a Maine home.
- A musty smell in the basement or rising into the house.
- Damp corners, or a basement that never feels fully dry.
- Visible growth on joists, walls, or stored belongings.
- Condensation, or air that feels sticky downstairs.
Removal, then moisture control
We remove the mold first. Then we fix what is letting moisture in, because that is what keeps it from coming back. The right fix depends on the source, so we start by finding it.
- Find the moisture source.Water intrusion, foundation moisture, poor drainage, or humidity buildup each call for a different fix.
- Contain and remove the mold.Barriers and negative air pressure protect the rest of the house while contaminated materials are removed and the area is treated.
- Encapsulate the crawl space.A heavy-duty vapor barrier across the ground and up the foundation walls, with insulation and a dehumidifier to keep the air dry. About crawl space encapsulation.
- Waterproof or dehumidify the basement.Waterproofing where water is getting in, and dehumidification where humidity is the problem. Basement waterproofing and dehumidification.
- Verify and document.We confirm the area is clear and give you written documentation.
What homeowners say
“John and his crew remediated our basement. It was not an easy task, but he persisted until the test showed the mold was cleared. John was very responsive, sent Safety Data Sheets for all of the products used, was willing to use one we requested and responded kindly and respectfully to concerns and changes in the plan.”
“The mold remediation industry, at large, is quick to take advantage of a homeowner and quote exorbitant fees while exaggerating the extent and scope of the problem. I arranged for three estimates. Enter John Crafts of Mattra. He was professional, courteous, and gave me an excellent assessment of the problem.”
- A clear, itemized breakdown before any work begins.
- One team handles the mold, the moisture fix, and any rebuild. No subcontractors.
- Clear guidance, practical next steps, and no pressure.
Common questions
What causes mold in a basement or crawl space?
Moisture that keeps getting in: seepage through the foundation, leaks, poor drainage, or humidity that never fully goes away. In a vented crawl space, humid summer air condensing on cold surfaces is a common cause in Maine.
Will removing the mold be enough?
Not if the moisture is still getting in. That is why we find the source and fix it with encapsulation, waterproofing, or dehumidification, depending on what the source is.
What is crawl space encapsulation?
It turns an open, vented crawl space into a sealed, dry space. A heavy-duty vapor barrier goes across the ground and up the foundation walls, the walls are insulated, and a dehumidifier keeps the air dry.
How long does mold removal take?
Most residential remediations take 1 to 5 days depending on scope. Moisture control work can add time, and you get a realistic timeline after the first assessment.
Where do you work?
Mattra is based in Lewiston and works with homeowners across Maine, including Lewiston, Auburn, Portland, Brunswick, Topsham, and Augusta. Not sure about your town? Call and we will confirm.
Musty smell or damp air downstairs?
Call and tell us what you are noticing. A local Mattra team member answers, and there is no pressure to book anything.