Mold Assessment in Chalmette for Raised and Rebuilt Houses
A survey that treats the space under a raised Chalmette house as part of the building, because in summer it is where the wet air comes in.
Mold Assessment quote in Chalmette
Tell us what you can see or smell, roughly where in the house it is, and whether the house is raised or on a slab. Those three things narrow it more than the size of the patch does, because they point at how the water is arriving rather than where it ended up.
Would you rather talk it through? Call (315) 640-3590.
$100 off your first job
Credited by us on your first booked job.
- One credit per customer per property, on your first booked job.
- Valid through December 31, 2026.
Mention this offer when you book. Full terms.
Chalmette's rebuilt stock and the federal opening rule
Chalmette has 9,039 housing units with a median year built of 1978, and 989 of them, 10.9 percent, were built between 2010 and 2019, one of the highest recent build shares in this service area. Only 164 units, 1.8 percent, predate 1940 and 54.8 percent predate 1980.
Source: United States Census Bureau, American Community Survey 2020-2024 five year estimates, accessed 2026-09-22
145 of Chalmette's 429 National Flood Insurance Program multiple loss properties, 34 percent, are recorded as mitigated, and 51 of Arabi's 150, also 34 percent. Across the metro as a whole the rate is far lower: 8 percent in New Orleans, 13 percent in Metairie and 1 percent in Laplace.
Source: Federal Emergency Management Agency, OpenFEMA dataset NFIP Multiple Loss Properties, data as of August 2, 2026, accessed 2026-09-22
Federal regulation 44 CFR 60.3(c)(5) requires that fully enclosed areas below the lowest floor which are subject to flooding be designed to automatically equalize hydrostatic flood forces by allowing the entry and exit of floodwaters, and sets the minimum criteria as a minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding, with the bottom of all openings no higher than one foot above grade.
Source: Office of the Federal Register, Electronic Code of Federal Regulations, Title 44 Section 60.3, accessed 2026-09-22
The Building America Solution Center states that during warm seasons in humid climates the outside air can contain more water vapor than the air within the crawl space, and that rather than helping to dry out a crawl space, the vents can actually encourage condensation in the crawl space by allowing warm, humid air to enter and condense on the floor joists, which are likely to be cooler, especially if the rooms above are air conditioned.
Source: Pacific Northwest National Laboratory, U.S. Department of Energy Building America Solution Center, accessed 2026-09-22
Why a Chalmette survey starts under the floor
A newer or mitigated Chalmette house can grow mold in a place its owner never goes. 989 homes here were built between 2010 and 2019, and 145 of the town's 429 repeat-loss properties are recorded as mitigated. Federal rules require an enclosed area below the lowest floor that is subject to flooding to have openings, at least one square inch for every square foot of enclosed area, so floodwater can pass in and out. Those same openings admit summer air, and building science guidance warns that humid air entering that space condenses on floor joists cooled by the air conditioned rooms above. The survey goes underneath first.
What to know about a raised Chalmette house first
Find out what is in the space under the floor before the visit: ductwork, insulation, stored belongings, bare ground or a slab. Ducts running through a humid enclosure are a condensation surface of their own. Do not block the flood openings to stop the air, since they exist to equalize flood pressure on the foundation. And decide who the report is for. St. Bernard Parish holds no Community Rating System class, so nothing in the report will change a rating discount; it is for your own decision, a buyer or an insurer.
What sits under the floor
Ducts, insulation, stored items or bare ground. Each gathers moisture differently, and ducts in a humid enclosure sweat on their own.
Whether the openings are flood vents or plain vents
Both let air in. Guidance favors flood vents built to cut standby air leakage over simply closing them.
When the smell is worst
A summer smell in a raised Chalmette house points under the floor. A smell after a storm points at the envelope.
What is running through the space underneath?
Ducts, insulation, stored boxes or nothing at all. Tell us, and the Chalmette survey starts in the right place.
Chalmette removal and drying after a survey
Chalmette survey questions from raised houses
Our Chalmette house was raised after it flooded. Why would it have mold now?
Raising it moved the living floor above the water, and it also created a space underneath that summer air moves through. Federal building science guidance notes that in humid climates vented underfloor spaces can encourage condensation on joists kept cooler by the air conditioning above. The survey reads the joists, the subfloor and anything running through that space to see whether that is what is happening.
Is testing the air under the house worth it?
Rarely. The EPA says that where growth is visible, sampling is in most cases unnecessary, and no federal limits exist to compare a result against. In Chalmette the better spend is on reading the joists and subfloor directly.
Send the Chalmette house, its age and what is under it
Raised, mitigated or built new, and roughly when. A person reads it and says whether a survey is worth booking.